SHARP R-519CK (01) PDF MANUAL

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SHARP R-519CK (01) PDF SUMMARY:

What should service personnel do if the unit operates with the door open?

Service personnel should 1) tell the user not to operate the oven and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration’s Center for Devices and Radiological Health immediately.

What should service personnel do if they find any certified unit with emissions in excess of 4mW/cm2?

Service personnel should inform SHARP ELECTRONICS CORPORATION and instruct the owner of the unit not to use it until the oven has been brought into compliance.

What should be done before servicing a microwave oven?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.

How should the high-voltage capacitor be discharged before servicing?

Wait for 60 seconds after the oven has been switched off, then short-circuit the connection of the high-voltage capacitor (that is the connecting lead of the high-voltage rectifier) against the chassis with the use of an insulated screwdriver.

What steps should be taken when troubleshooting requires connecting the power supply after the outer case has been removed?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Disconnect the leads to the primary of the power transformer.
  5. Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.
  6. After that procedure, reconnect the power supply cord.

What steps should be taken when testing is completed?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Reconnect the leads to the primary of the power transformer.
  5. Reinstall the outer case (cabinet).
  6. Reconnect the power supply cord after the outer case is installed.
  7. Run the oven and check all functions.

What steps should be taken after repairing a microwave oven?

  1. Reconnect all leads removed from components during testing.
  2. Reinstall the outer case (cabinet).
  3. Reconnect the power supply cord after the outer case is installed.
  4. Run the oven and check all functions.

How can you test for the presence of microwave energy within the oven cavity?

Place a cup of cold water on the oven turntable, close the door, set the power to HIGH, and set the microwave timer for two (2) minutes. After two minutes, check that the water is hot. If the water remains cold, carry out the “Before Servicing” procedure and re-examine the connections to the component being tested.

What should be done when all service work is completed and the oven is fully assembled?

The microwave power output should be checked and a microwave leakage test should be carried out.

What is the microwave leakage limit (Power density limit)?

The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external surface of the oven.

What should the safety interlock switches do?

  • The primary interlock relay and door sensing switch shall prevent microwave radiation emission in excess of the requirement as mentioned above.
  • The secondary interlock switch shall prevent microwave radiation emission in excess of 5 mW/cm2 at any point 5cm or more from the external surface of the oven.

What are the steps for preparation before beginning the actual measurement of leakage?

  1. Make sure that the actual instrument is operating normally as specified in its instruction booklet.
  2. Place the oven tray in the oven cavity.
  3. Place a load of 275±15 ml (9.8 oz) of tap water initially at 20±5˚C (68˚F) in the center of the oven cavity. The water container should be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.) and made of an electrically nonconductive material such as glass or plastic.
  4. Set the cooking control on Full Power Cooking Mode.
  5. Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed, replace it with 275 ml of cool water.

How is the closed-door leakage test performed?

  1. Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.
  2. Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on the meter.
  3. Check for leakage at the door screen, sheet metal seams, and other accessible positions where the continuity of the metal has been breached (e.g., around the switches, indicator, and vents). While testing for leakage around the door, pull the door away from the front of the oven as far as is permitted by the closed latch assembly.
  4. Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2, and that the secondary interlock switch does turn the oven OFF before any door movement.

What should be recorded after servicing?

After servicing, record data on the service invoice and microwave leakage report.

What precautions should be taken to avoid electrical shock and microwave radiation hazard?

Check the interlock switches and the door seal carefully.

What should be ensured before operating the oven?

  • The door is tightly closed.
  • The door brackets and hinges are not defective.
  • The door packing is not damaged.
  • The door is not deformed or warped.
  • There is no other visible damage with the oven.

What parts should service personnel not contact while the appliance is energized?

High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness; If provided, Vent Hood, Fan assembly, Cooling Fan Motor.

What is the power requirement for the microwave oven?

120 Volts / 13 Amperes, 60 Hertz Single phase, 3 wire grounded.

What is the power output of the microwave oven?

1100 watts (IEC-705 TEST PROCEDURE).

What is the operating frequency of the microwave oven?

2450MHz.

What are the dimensions of the microwave oven case?

Width: 24" Height: 13-3/8" Depth: 19-1/8".

What are the dimensions of the microwave oven cooking cavity?

Width: 17-3/8" Height: 10-1/2" Depth: 18-5/8" 2. 0 Cubic Feet.

What is the control complement of the microwave oven?

Touch Control System, Clock ( 1:00 – 12:59 ), Timer (0 – 99 min. 99 seconds).

What are the microwave power levels for variable cooking?

  • P-HI: Full power throughout the cooking time
  • P-90: approx. 90% of Full Power
  • P-80: approx. 80% of Full Power
  • P-70: approx. 70% of Full Power
  • P-60: approx. 60% of Full Power
  • P-50: approx. 50% of Full Power
  • P-40: approx. 40% of Full Power
  • P-30: approx. 30% of Full Power
  • P-20: approx. 20% of Full Power
  • P-10: approx. 10% of Full Power
  • P-0: No power throughout the cooking time

What are the available control pads?

CUSTOM HELP pad, COMPU DEFROST pads, SENSOR COOK pads, INSTANT ACTION pads, Number selection pads, Kitchen Timer pad, Clock pad, Minute Plus pad, Power Level pad, Stop/Clear pad, Start pad

Sensor Cooking pads, Breakfast Bar pad, Lunch on the Run pad, One Dish Dinners pad, Super Defrost pad, Compu Defrost pad, Beverage Center pad, Number selection pads, Kitchen Timer pad, Clock pad, Minute Plus pad, Power Level pad, Stop/Clear pad, Start Touch On pad

Is there an oven cavity light?

Yes.

What are the safety standards for the microwave oven?

UL Listed, FCC Authorized, DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J.

What are the grounding instructions for the microwave oven?

This oven is equipped with a three-prong grounding plug. It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinances. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current. CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM THIS PLUG.

What are the electrical requirements for the microwave oven?

The electrical requirements are a 120 volt 60 Hz, AC only, 15 or 20 amp fused electrical supply. It is recommended that a separate circuit serving only this appliance be provided.

What should a customer do if they encounter a two-pronged wall receptacle?

It is the personal responsibility and obligation of the customer to contact a qualified electrician and have it replaced with a properly grounded three-pronged wall receptacle or have a grounding adapter properly grounded and polarized.

What type of extension cord should be used if needed?

If an extension cord must be used, it should be a 3-wire, 15 amp or higher-rated cord. Do not drape it over a countertop or table where it can be pulled on by children or tripped over accidentally.

What are the components of the microwave oven?

  1. One-touch door open button.
  2. Door latches.
  3. Removable turntable support.
  4. Removable turntable.
  5. Oven lamp.
  6. Oven door with see-through window.
  7. Ventilation openings.
  8. Auto-Touch control panel.
  9. Time display.
  10. Coupling.
  11. Wave guide cover.
  12. Power supply cord.

How does the microwave operate in the OFF CONDITION?

Closing the door activates the door sensing switch and secondary interlock switch. (In this condition, the monitor switch contacts are opened.) When the oven is plugged in, 120 volts A.C. is supplied to the control unit. For model R-519CK, the display will show flashing “88:88”. For models R-530CK/CW, the display will show “SHARP SIMPLY PRESS CLEAR AND PRESS CLOCK”. To set any program or set the clock, you must first touch the STOP/CLEAR pad. The display will clear, and " : " will appear.

How does the microwave operate in the COOKING CONDITION?

  1. Program desired cooking time by touching the NUMBER pads.
  2. Program the power level by touching the POWER LEVEL pad and then a Number pad.
  3. When the START pad is touched, the following operations occur:
    • The contacts of relays are closed and components connected to the relays are turned on.
      • RELAY (RY-1): oven lamp/turntable motor/fan motor
      • RELAY (RY-2): power transformer
    • 120 volts A.C. is supplied to the primary winding of the power transformer and is converted to about 3.3 volts A.C. output on the filament winding, and approximately 2370 volts A.C. on the high voltage winding.
    • The filament winding voltage heats the magnetron filament and the H.V. winding voltage is sent to a voltage doubler circuit.
    • The microwave energy produced by the magnetron is channeled through the waveguide into the cavity feed-box, and then into the cavity where the food is placed to be cooked.
    • Upon completion of the cooking time, the power transformer, oven lamp, etc. are turned off, and the generation of microwave energy is stopped. The oven will revert to the OFF condition.
    • When the door is opened during a cook cycle, the monitor switch, door sensing switch, secondary interlock switch, relay (RY1) and primary interlock relay are activated with the following results:
      • The circuits to the turntable motor, the cooling fan motor, and the high voltage components are de-energized, the oven lamp remains on, and the digital read-out displays the time still.
  4. The monitor switch electrically monitors the operation of the secondary interlock switch and primary interlock relay and is mechanically associated with the door so that it will function in the following sequence:
  • When the door opens from the closed position, the primary interlock relay (RY2) and secondary interlock switch open their contacts. And contacts of the relay (RY1) remains closed. Then the monitor switch contacts close. * When the door is closed from the open position, the monitor switch contacts open first. Then the contacts of the secondary interlock switch and door sensing switch close. And contacts of the relay (RY1) open.

What happens if the secondary interlock switch and primary interlock relay fail with the contacts closed when the door is opened?

The closing of the monitor switch contacts will form a short circuit through the monitor fuse, secondary interlock switch, relay (RY1) and primary interlock relay (RY2), causing the monitor fuse to blow.

How does the microwave operate with Variable Cooking Power (P-0 to P-90)?

When Variable Cooking Power is programmed, the 120 volts A.C. is supplied to the power transformer intermittently through the contacts of relay (RY-2) which is operated by the control unit within a 32-second time base. The following is the microwave power operation:

VARI-MODE ON TIME OFF TIME
Power 10 (P-HI) 32 sec. 0 sec. (100% power)
Power 9 (P-90) 30 sec. 2 sec. (approx. 90% power)
Power 8 (P-80) 26 sec. 6 sec. (approx. 80% power)
Power 7 (P-70) 24 sec. 8 sec. (approx. 70% power)
Power 6 (P-60) 22 sec. 10 sec. (approx. 60% power)
Power 5 (P-50) 18 sec. 14 sec. (approx. 50% power)
Power 4 (P-40) 16 sec. 16 sec. (approx. 40% power)
Power 3 (P-30) 12 sec. 20 sec. (approx. 30% power)
Power 2 (P-20) 8 sec. 24 sec. (approx. 20% power)
Power 1 (P-10) 6 sec. 26 sec. (approx. 10% power)
Power 0 (P-0) 0 sec. 32 sec. (0% power)

Why does the ON/OFF time ratio not correspond with the percentage of microwave power?

Approximately 2 seconds are needed for heating of the magnetron filament.

How does the microwave operate in SENSOR COOKING CONDITION?

The food is cooked without figuring time, power level, or quantity. When the oven senses enough steam from the food, it relays the information to its microprocessor, which will calculate the remaining cooking time and power level needed for best results. When the food is cooked, water vapor is developed. The sensor “senses” the vapor, and its resistance increases gradually. When the resistance reaches the value set according to the menu, supplementary cooking is started. The time of supplementary cooking is determined by experiment with each food category and inputted into the LSI.

What is the process when cooking potatoes with the sensor function?

  1. Potatoes at room temperature emit vapor very slowly.
  2. As the potatoes heat, moisture and humidity are emitted rapidly, and an aroma can be smelled.
  3. The sensor detects moisture and humidity and calculates cooking time and variable power.

How do you use the SENSOR COOK function?

  1. Touch one of the SENSOR pads (for R-519CK). Touch one of the SENSOR pads and then touch the Start pad (for R-530CK/CW).
  2. The coil of shut-off relay (RY-1) is energized, the turntable motor, oven lamp and cooling fan motor are turned on, but the power transformer is not turned on.
  3. After about 16 seconds, the cook relay (RY-2) is energized. The power transformer is turned on, microwave energy is produced, and the first stage is started. The 16 seconds is the cooling time required to remove any vapor from the oven cavity and sensor. NOTE: During this first stage, do not open the door or touch the STOP/CLEAR pad.
  4. When the sensor detects the vapor emitted from the food, the display switches over to the remaining cooking time, and the timer counts down to zero. At this time, the door may be opened to stir, turn, or season food.
  5. When the timer reaches zero, an audible signal sounds. The shut-off relay and cook relay are de-energized, and the power transformer, oven lamp, etc. are turned off.
  6. Opening the door or touching the STOP/CLEAR pad, the time of day will reappear on the display, and the oven will revert to an OFF condition.

What is a NOTE about using the SENSOR function immediately after plugging in the unit?

The oven should not be operated on SENSOR immediately after plugging in the unit. Wait two minutes before cooking on SENSOR.

How do you open the microwave door?

The door is opened by pushing the open button on the control panel. When the open button is pushed, the open button pushes up the switch lever, and then the switch lever pushes up the latch head. The latch heads are moved upward and released from the latch hook. Now the door will open.

What happens when the microwave door is opened?

When the door is opened, the switches interrupt the power to all high voltage components.

What must happen before a cook cycle can take place?

A cook cycle cannot take place until the door is firmly closed thereby activating both interlock switches.

What does the monitor switch do?

The monitor switch is intended to render the oven inoperative, by means of blowing the monitor fuse, when the contacts of the primary interlock relay (RY2) and secondary interlock switch fail to open when the door is opened.

What happens to the monitor switch contacts when the door is opened?

When the door is opened, the monitor switch contact close (to the ON condition) due to their being normally closed.

What is the state of the primary interlock relay (RY2) and secondary interlock switch when the door is opened?

At this time the primary interlock relay (RY2) and secondary interlock switch are in the OFF condition (contacts open) due to their being normally open contact switches.

What happens as the door goes to a closed position?

As the door goes to a closed position, the monitor switch contacts are first opened and then the door sensing switch and the secondary interlock switch contacts close.

What happens if the door is opened, and the primary interlock relay fails to open?

If the door is opened, and the primary interlock relay open, the monitor fuse blows simultaneously with closing of the monitor switch contacts.

What should be done before replacing a blown monitor fuse?

Before replacing a blown monitor fuse, test the door sensing switch, primary interlock relay (RY2), relay (RY1), secondary interlock switch and monitor switch for proper operation.

What comes as an assembly?

The monitor fuse and monitor switch are replaced as an assembly.

What is the purpose of the turntable motor?

The turntable motor rotates the turntable located on the bottom of the oven cavity, so that the foods on the turntable cook evenly during cooking. The turntable may turn in either direction.

What does the cooling fan motor do?

The cooling fan motor drives a blade which draws external cool air. This cool air is directed through the air vanes surrounding the magnetron and cools the magnetron. This air is channelled through the oven cavity to remove steam and vapors given off from the heating foods. It is then exhausted through the exhausting air vents at the oven cavity.

When does the monitor fuse blow?

The monitor fuse blows when the contacts (COM-NO) of the primary interlock relay (RY2) and secondary interlock switch remain closed with the oven door open and when the monitor switch closes.

What else can cause the monitor fuse to blow?

If the wire harness or electrical components are short-circuited, this monitor fuse blows to prevent an electric shock or fire hazard.

What is the purpose of the cavity temperature fuse?

The cavity temperature fuse located on the top of the oven cavity, is designed to prevent damage to the oven by fire.

When will the cavity temperature fuse open?

When abnormally high temperatures are reached within the oven cavity, the cavity temperature fuse will open at 302˚F(150˚C) causing the oven to shut down.

Is the cavity temperature fuse resettable?

No, it does not reset.

What is the purpose of the magnetron temperature fuse?

The magnetron temperature fuse located near the magnetron is designed to prevent damage to the magnetron if an over heated condition develops in the tube due to cooling fan failure, obstructed air guide, dirty or blocked air intake, etc.

When will the magnetron temperature fuse open?

When abnormally high temperatures are reached within the magnetron, the magnetron temperature fuse will open at 302˚F(150˚C) causing the oven to shut down.

What should you never touch while the power supply is connected?

Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.

What should you do if the oven becomes inoperative because of a blown monitor fuse?

If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, relay (RY1) primary interlock relay (RY2), door sensing switch and secondary interlock switch before replacing the monitor fuse.

What else should be replaced if the monitor fuse is replaced?

If the monitor fuse is replaced, the monitor switch must also be replaced.

What part number is the monitor fuse and monitor switch assembly?

Use part FFS-BA016/ KIT as an assembly.

What are the steps for troubleshooting when the power supply cord is disconnected?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Disconnect the leads to the primary of the power transformer.
  5. Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.
  6. After that procedure, reconnect the power supply cord.

What are the steps to take when testing is completed?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Reconnect the leads to the primary of the power transformer.
  5. Reinstall the outer case (cabinet).
  6. Reconnect the power supply cord after the outer case is installed.
  7. Run the oven and check all functions.

What are some possible problems that can occur with the microwave?

  • Home fuse or circuit breaker blows when power cord is plugged into wall receptacle.
  • Monitor fuse blows when power cord is plugged into wall receptacle.
  • All letters and indicators do not appear in display when power cord is first plugged into wall outlet.
  • Display does not operate properly when STOP/CLEAR key is touched. (Buzzer should sound and “:” or time of day should appear in display.)
  • Oven lamp does not light when door is opened.
  • Oven lamp does not go out when door is closed.
  • Oven lamp lights but fan motor and turntable motor do not operate.
  • Oven does not go into cook cycle when START pad is touched.
  • Oven seems to be operating but little or no heat is produced in oven load. (Food incompletely cooked or not cooked at all at end of cook cycle.)
  • Oven goes into a cook cycle but extremely uneven heating is produced in oven load (food).
  • Oven does not cook properly when programmed for Cooking Power 5 mode. (Operates properly on Cooking Power 10 (HIGH) mode.)
  • Oven goes into COMPU DEFROST but food is not defrosted well.
  • AH sensor does not end during Sensor cooking condition. (Oven does not shut off after a cup of water is boiling by sensor cooking.)
  • Oven stops at 16 sec. after starting.

What are the steps to test the power transformer?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter.
  5. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be approximately 90 ohms; the resistance of the filament coil should be less than 1 ohm.
  6. Reconnect all leads removed from components during testing.
  7. Reinstall the outer case (cabinet).
  8. Reconnect the power supply cord after the outer case is installed.

What are the steps to test the magnetron?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than 1 ohm.
  5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and chassis ground. This test should indicate an infinite resistance. If there is little or no resistance the magnetron is grounded and must be replaced.
  6. Reconnect all leads removed from components during testing.
  7. Reinstall the outer case (cabinet).
  8. Reconnect the power supply cord after the outer case is installed.
  9. Run the oven and check all functions.

When should you use the water temperature rise test?

This test should only be used if the above tests do not indicate a faulty magnetron and there is no defect in the following components or wiring: silicon rectifier, high voltage capacitor and power transformer.

What materials are needed for the water temperature rise test?

This test will require a 16 ounce (453cc) measuring cup and an accurate mercury thermometer or thermocouple type temperature tester.

What are the steps for the water temperature rise test?

  1. Fill the measuring cup with 16 oz. (453cc) of tap water and measure the temperature of the water with a thermometer or thermocouple temperature tester. Stir the thermometer or thermocouple through the water until the temperature stabilizes. Record the temperature of the water.
  2. Place the cup of water in the oven. Operate oven at POWER 10(HIGH) selecting more than 60 seconds cook time. Allow the water to heat for 60 seconds, measuring with a stop watch, second hand of a watch or the digital read-out countdown.
  3. Remove the cup from the oven and again measure the temperature, making sure to stir the thermometer or thermocouple through the water until the maximum temperature is recorded.
  4. Subtract the cold water temperature from the hot water temperature. The normal result should be 38 to78˚F(21 to 42.6˚C) rise in temperature.

What does the water temperature rise test indicate?

If the water temperatures are accurately measured and tested for the required time period the test results will indicate if the magnetron tube has low power output (low rise in water temperature) which would extend cooking time or high power output (high rise in water temperature) which would reduce cooking time.

When should the magnetron tube assembly be replaced?

The magnetron tube assembly should be replaced only if the water temperature rise test indicates a power output well beyond the normal limits.

What conditions must be met for the water temperature rise test to be accurate?

The test is only accurate if the power supply line voltage is 120 volts and the oven cavity is clean.

What are the steps to test the high voltage capacitor?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and check for short or open between the terminals using an ohmmeter. Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate continuity for a short time and should indicate an open circuit once the capacitor is charged. If the above is not the case, check the capacitor with an ohmmeter to see if it is shorted between either of the terminals and case. If it is shorted, replace the capacitor.
  5. Reconnect all leads removed from components during testing.
  6. Reinstall the outer case (cabinet).
  7. Reconnect the power supply cord after the outer case is installed.
  8. Run the oven and check all functions.

What are the steps to test the cavity temperature fuse?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. A continuity check across the cavity temperature fuse terminals should indicate a closed circuit unless the temperature of the cavity temperature fuse reaches approximately 302˚F(150˚C). An open cavity temperature fuse indicates overheating of the oven, exchange the cavity temperature fuse and check inside of oven cavity and for improper setting of cooking time or operation of control unit. Check for restricted air flow through the vent holes of the oven cavity, especially the cooling fan and air guide.
  5. Reconnect all leads removed from components during testing.
  6. Reinstall the outer case (cabinet).
  7. Reconnect the power supply cord after the outer case is installed.
  8. Run the oven and check all functions.

What are the steps to test the magnetron temperature fuse?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. A continuity check across the magnetron temperature fuse terminals should indicate a closed circuit unless the temperature of the magnetron temperature fuse reaches approximately 302˚F(150˚C). An open magnetron temperature fuse indicates overheating of the magnetron. Check for restricted air flow through the vent holes of the oven cavity, especially the cooling fan and air guide.

What are the steps to test the high voltage rectifier?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading. If a short is indicated in both directions, or if an infinite resistance is read in both directions, the rectifier is probably defective and should be replaced.
  5. Reconnect all leads removed from components during testing.
  6. Reinstall the outer case (cabinet).
  7. Reconnect the power supply cord after the outer case is installed.
  8. Run the oven and check all functions.

What kind of ohmmeter should be used when testing the high voltage rectifier?

Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts.

What should you not attempt to measure at the high voltage terminal?

Do not attempt to measure the filament and high voltage.

What are the steps to test the monitor switch?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Before performing this test, make sure that the secondary interlock switch and the primary interlock relay are operating properly, according to the above Switch Test Procedure. Disconnect the wire lead from the monitor switch (COM) terminal. Check the monitor switch operation by using the ohmmeter as follows. When the door is open, the meter should indicate a closed circuit. When the monitor switch with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open circuit. If improper operation is indicated, the switch may be defective.
  5. After testing the monitor switch, reconnect the wire lead to the monitor switch (COM) terminal and check the continuity of the monitor circuit.
  6. Reconnect all leads removed from components during testing.
  7. Reinstall the outer case (cabinet).
  8. Reconnect the power supply cord after the outer case is installed.
  9. Run the oven and check all functions.

What should you do if the temperature fuse indicates an open circuit at room temperature?

If the temperature fuse indicates an open circuit at room temperature, replace temperature fuse.

What are the steps to test the secondary interlock switch?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch. The meter should indicate an open circuit with the door open and a closed circuit with the door closed. If improper operation is indicated, replace the secondary interlock switch.
  5. Reconnect all leads removed from components during testing.
  6. Reinstall the outer case (cabinet).
  7. Reconnect the power supply cord after the outer case is installed.
  8. Run the oven and check all functions.

What are the steps to test the door sensing switch?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of the switch. The meter should indicate an open circuit with the door open and a closed circuit with the door closed. If improper operation is indicated, replace the door sensing switch.
  5. Reconnect all leads removed from components during testing.
  6. Reinstall the outer case (cabinet).
  7. Reconnect the power supply cord after the outer case is installed.
  8. Run the oven and check all functions.

What happens if the door sensing switch contacts fail in the open position and the door is closed?

If the door sensing switch contacts fail in the open position and the door is closed, the cooling fan, turntable and oven light will be activated by RY1.

What are the steps to test the primary interlock relay (RY2)?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Disconnect two (2) wire leads from the male tab terminals of the Primary Interlock Relay. Check the state of the relay contacts using a ohmmeter. The relay contacts should be open. If the relay contacts are closed, replace the circuit board entirely or the relay itself.
  5. Reconnect all leads removed from components during testing.
  6. Reinstall the outer case (cabinet).
  7. Reconnect the power supply cord after the outer case is installed.
  8. Run the oven and check all functions.

What should you check if the monitor fuse is blown when the door is opened?

If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary interlock switch and monitor switch according to the “TEST PROCEDURE” for those switches before replacing the blown monitor fuse.

What should you do before replacing a blown monitor fuse?

Before replacing a blown monitor fuse, test the primary interlock relay, secondary interlock switch, door sensing switch and monitor switch for proper operation.

What must be replaced if the monitor fuse is blown by improper switch operation?

If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must be replaced with “monitor fuse and monitor switch assembly” part number FFS-BA016/KIT, even if the monitor switch operates normally.

What is the monitor fuse and monitor switch assembly comprised of?

The monitor fuse and monitor switch assembly is comprised of a 20 ampere fuse and switch.

Why can’t proper maintenance be performed with only a voltmeter and ohmmeter on the touch control panel?

The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc.

What is the touch control panel assembly divided into?

The touch control panel assembly is divided into two units, Control Unit and Key Unit.

What is the Control Unit divided into?

The Control Unit is divided into two units, LSI Unit and Power Unit.

How is troubleshooting performed on the touch control panel?

Troubleshooting by unit replacement is described according to the symptoms indicated.

What are the steps before testing the touch control panel?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Disconnect the leads to the primary of the power transformer.
  5. Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.
  6. After that procedure, re-connect the power supply cord.

What are the steps to test the key unit?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Check Key unit ribbon connection before replacement.
  5. Reconnect all leads removed from components during testing.
  6. Re-install the outer case (cabinet).
  7. Reconnect the power supply cord after the outer case is installed.
  8. Run the oven and check all functions.

What symptoms indicate a defective key unit?

  • When touching the pads, a certain pad produces no signal at all.
  • When touching a number pad, two figures or more are displayed.
  • When touching the pads, sometimes a pad produces no signal.

What are the steps to replace a defective key unit?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Replace the Key unit.
  5. Reconnect all leads removed from components during testing.
  6. Re-install the outer case (cabinet).
  7. Reconnect the power supply cord after the outer case is installed.
  8. Run the oven and check all functions.

What symptoms indicate a defective control unit?

  • In connection with pads:
    • When touching the pads, a certain group of pads do not produce a signal.
    • When touching the pads, no pads produce a signal.
  • In connection with indicators:
    • At a certain digit, all or some segments do not light up.
    • At a certain digit, brightness is low.
    • Only one indicator does not light.
    • The corresponding segments of all digits do not light up; or they continue to light up.
    • Wrong figure appears.
    • A certain group of indicators do not light up.
    • The figure of all digits flicker.
  • Other possible problems caused by defective control unit:
    • Buzzer does not sound or continues to sound.
    • Clock does not operate properly.
    • Cooking is not possible.

What should you do before replacing the control unit?

Before replacing the control unit, perform the Key unit test (Procedure J) to determine if the control unit is faulty.

What are the steps to take when testing is completed?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Reconnect all leads removed from components during testing.
  5. Re-install the outer case (cabinet).
  6. Reconnect the power supply cord after the outer case is installed.
  7. Run the oven and check all functions.

What are the steps to test the key unit?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable is making good contact, verify that the door sensing switch (stop switch) operates properly; that is the contacts are closed when the door is closed and open when the door is open.
  5. If the door sensing switch (stop switch) is good, disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door sensing switch is closed (either close the door or short the door sensing switch connecter). Use the Key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to the STOP/CLEAR pad making momentary contact. If the control unit responds by clearing with a beep the key unit is faulty and must be replaced. If the control unit does not respond, it is a faulty and must be replaced. If a specific pad does not respond, the above method may be used (after clearing the control unit) to determine if the control unit or key pad is at fault.
  6. Reconnect all leads removed from components during testing.
  7. Re-install the outer case (cabinet).
  8. Reconnect the power supply cord after the outer case is installed.
  9. Run the oven and check all functions.

What are the steps to test the relays?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Disconnect the leads to the primary of the power transformer.
  5. Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.
  6. After that procedure, re-connect the power supply cord.
  7. Remove the outer case and check voltage between Pin No. 1 of the 2 pin connector (A) and the common terminal of the relay RY1 on the control unit with an A.C. voltmeter. The meter should indicate 120 volts, if not check oven circuit.
  8. Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
    • DC. voltage indicated … Defective relay.
    • DC. voltage not indicated … Check diode which is connected to the relay coil. If diode is good, control unit is defective.
  9. Disconnect the power supply cord, and then remove outer case.
  10. Open the door and block it open.
  11. Discharge high voltage capacitor.
  12. Reconnect all leads removed from components during testing.
  13. Re-install the outer case (cabinet).
  14. Reconnect the power supply cord after the outer case is installed.
  15. Run the oven and check all functions.

What are the operational voltages and connected components for relays RY1 and RY2?

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS
RY1 Approx. 24.3V D.C. Oven lamp / Turntable motor / Cooling fan motor
RY2 Approx. 23.4V D.C. Power transformer

What are the steps to test the COMPU DEFROST?

  1. For R-519CK, close the door, touch the " Steaks / chops " pad once.
  2. For R-530CK/CW, close the door, touch the Compu Defrost pad three times and touch the number pad 5. And then touch the Start pad.
  3. The oven is in Compu Defrost cooking condition.
  4. The oven will operate as follows:
WEIGHT 1ST STAGE 2ND STAGE
LEVEL TIME LEVEL TIME
0.5lb 60% 47sec. 40% 37sec.
  1. If improper operation is indicated, the control unit is probably defective and should be checked.

What are the steps to check the foil pattern on the printed wiring board?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Follow the troubleshooting guide given below for repair.
STEPS OCCURRENCE CAUSE OR CORRECTION
1 Only pattern at “a” is broken. *Insert jumper wire J1 and solder.
2 Pattern at “a” and “b” are broken. *Insert the coil RCILF2003YAZZ between “c” and “d”.
  1. Make a visual inspection of the varistor. Check for burned damage and examine the transformer with a tester for the presence of layer short-circuit (check the primary coil resistance which is approximately 210Ω ± 15%). If any abnormal condition is detected, replace the defective parts.
  2. Reconnect all leads removed from components during testing.
  3. Re-install the outer case (cabinet).
  4. Reconnect the power supply cord after the outer case is installed.
  5. Run the oven and check all functions.

What are the steps if the indicator does not light up after checking and repairing the foil pattern?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Disconnect the leads to the primary of the power transformer.
  5. Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.
  6. After that procedure, re-connect the power supply cord.
  7. Follow the troubleshooting guide given below for repair.
STEPS OCCURRENCE CAUSE OR CORRECTION
1 The rated AC voltage is not present between Pin No. 1 of the 2-pin connector (A) and the common terminal of the relay RY1. Check supply voltage and oven power cord.
2 The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective.

What are the steps for component testing?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Reconnect all leads removed from components during testing.
  5. Re-install the outer case (cabinet).
  6. Reconnect the power supply cord after the outer case is installed.
  7. Run the oven and check all functions.

What are the initial conditions to check when using the sensor cooking function?

  • The oven should be plugged in at least two minutes before sensor cooking.
  • Room temperature should not exceed 95˚F (35˚C).
  • The unit should not be installed in any area where heat and steam are generated.
  • The unit should not be installed, for example, next to a conventional surface unit. Refer to the “INSTALLATION INSTRUCTIONS” of the operation manual.
  • Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To permit adequate ventilation, be sure to install so as not to block these vents. There should be some space for air circulation.
  • Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any moisture with a dry cloth or paper towel.
  • The Sensor works with food at normal storage temperature. For example, chicken pieces would be at refrigerator temperature and canned soup at room temperature.
  • Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. The sensor will detect the vapor given of by the spray and turn off before food is properly cooked.
  • If the sensor has not detected the vapor of the food, ERROR will appear and the oven will shut off.

What are the steps for performing a water load cooking test?

  1. Make sure the oven has been plugged in at least two minutes before checking sensor cook operation. The cabinet should be installed and screws tightened.
  2. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
  3. Place the container on the center of tray in the oven cavity.
  4. Close the door.
  5. For R-519CK, touch REHEAT pad once. Now, the oven is in the sensor cooking condition and “REHEAT” “SENSOR” will appear in the display.
  6. For R-530CK/CW, touch Sensor reheat pad once and touch the start pad. Now, the oven is in the sensor cooking condition and “SENSOR REHEAT” will appear in the display.
  7. The oven will operate for the first 16 seconds, without generating microwave energy. NOTE: ERROR will appear if the door is opened or STOP/CLEAR pad is touched during first stage of sensor cooking.
  8. After approximately 16 seconds, microwave energy is produced, and the display should start to count down the remaining cooking time and oven should turn off after water is boiling (bubbling).
  9. If the oven does not turn off, replace the AH sensor or check the control unit.

How do you test the AH sensor?

The simplest method is to replace it with a new replacement sensor.

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Remove the AH sensor.
  5. Install the new AH sensor.
  6. Reconnect all leads removed from components during testing.
  7. Reconnect the power supply cord after the outer case is installed.
  8. Reconnect the oven to the power supply and check the sensor cook operation.
    • Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
    • Place the container on the center of tray in the oven cavity.
    • Close the door.
    • For R-519CK, touch REHEAT pad once.
    • For R-530CK/CW, touch Sensor reheat pad and touch the Start pad.
    • The control panel is in automatic Sensor operation.
    • The display will start to count down the remaining cooking time, and the oven will turn off automatically after the water is boiling (bubbling).
    • If the new sensor does not operate properly, the problem is with the control unit.

How do you check the control unit?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Disconnect the sensor connector that is mounted to control panel.
  5. Then connect the dummy resistor circuit to the sensor connector of control panel.
  6. Disconnect the leads to the primary of the power transformer.
  7. Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.
  8. After that procedure, re-connect the power supply cord.
  9. Check the sensor cook operation.
    • For R-519CK, touch REHEAT pad once. For R-530CK/CW, touch Sensor reheat pad and touch the Start pad.
    • The control panel is in the sensor cooking operation.
    • After approximately 30 seconds, push plunger of select switch for more than 3 seconds. This condition is same as judgement by AH sensor.
    • After approximately 3 seconds, the display shows “X X . X X “ which is the remaining cooking time, and the display count down.
    • If the above is not the case, the control unit is probably defective. If the above is proper, the AH sensor is probably defective.
  10. Disconnect the power supply cord, and then remove outer case.
  11. Open the door and block it open.
  12. Discharge high voltage capacitor.
  13. Disconnect the dummy resistor circuit from the sensor connector of control panel.
  14. Carry out necessary repair.
  15. Reconnect all leads removed from components during testing and repairing.
  16. Re-install the outer case (cabinet).
  17. Reconnect the power supply cord after the outer case is installed.
  18. Run the oven and check all functions.
  19. Carry out “Water load cooking test” again and ensure that the oven works properly.

What is the dummy resistor circuit?

Component Value
R1, R2 22Ω ± 1% 1/2W
R3 4.3kΩ ± 5% 1/4W
R4 1MΩ ± 5% 1/4W

What is the purpose of the relay circuit?

A circuit to drive the magnetron, fan motor, turntable motor, and light the oven lamp.

What is the purpose of the buzzer circuit?

The buzzer is responsive to signals from the LSI to emit audible sounds (key touch sound and completion sound).

What is the purpose of the synchronizing signal circuit?

The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit. It accompanies a very small error because it works on commercial frequency.

What is the purpose of the door sensing switch?

A switch to “tell” the LSI if the door is open or closed.

What is the purpose of the back light circuit?

  • For R-519CK: A circuit to drive the back light (Light emitting diodes LD1- LD4).
  • For R-530CK/CW: A circuit to drive the back light (Light emitting diodes LD10-LD19).

What are the main components of the touch control section?

  • Key Unit
  • Control Unit (The Control Unit consists of Power Unit and LSI Unit)

How does the Key Unit work?

The key unit is composed of a matrix, signals generated in the LSI are sent to the key unit through P10-P17. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through AN11, AN10, AN9, P42, P41 and AN8 to perform the function that was requested.

What does the Control Unit consist of?

The Control unit consists of LSI, ACL circuit, indicator circuit, power source circuit, relay circuit, buzzer circuit, synchronizing signal circuit, absolute humidity sensor circuit and back light circuit.

What is the purpose of the ACL circuit?

This circuit generates a signal which resets the LSI to the initial state when power is supplied.

What is the purpose of the indicator circuit?

  • For R-519CK: This circuit consists of 36 segments and 3 common electrodes using a Liquid Crystal Display.
  • For R-530CK/CW: This circuit consists of 40 segments and 16 common electrodes using a Liquid Crystal Display. The Liquid Crystal Display (LCD) is driven by LCD driver IC3.

What is the purpose of the Power Source Circuit?

This circuit generates voltages necessary in the control unit from the AC line voltage. In addition, the synchronizing signal is available in order to compose a basic standard time in the clock circuit.

What are the precautions for handling electronic components?

  • When storing and transporting, thoroughly wrap them in aluminum foil. Also wrap all PW boards containing them in aluminum foil.
  • When soldering, ground the technician and use a grounded soldering iron and work table.

How do you service the touch control panel with the power supply of the oven?

CAUTION: THE HIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL LIVE DURING SERVICING AND PRESENTS A HAZARD.

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Disconnect the leads to the primary of the power transformer.
  5. Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.
  6. After that procedure, re-connect the power supply cord. After checking the performance of the touch control panel:
  7. Disconnect the power supply cord.
  8. Open the door and block it open.
  9. Re-connect the leads to the primary of the power transformer.
  10. Re-connect the power supply cord after the outer case is installed.
  11. Run the oven and check all functions.

Note:

  • On some models, the power supply cord between the touch control panel and the oven itself is so short that the two can’t be separated. For those models, check and repair all the controls (sensor-related ones included) of the touch control panel while keeping it connected to the oven.
  • On some models, the power supply cord between the touch control panel and the oven proper is long enough that they may be separated from each other. For those models, it is possible to check and repair the controls of the touch control panel while keeping it apart from the oven proper; in this case you must short both ends of the door sensing switch (on PWB) of the touch control panel with a jumper, which activates an operational state that is equivalent to the oven door being closed. As for the sensor-related controls of the touch control panel, checking them is possible if dummy resistor(s) with resistance equal to that of the controls are used.

How do you service the touch control panel with power supply from an external power source?

  1. Disconnect the touch control panel completely from the oven proper, and short both ends of the door sensing switch (on PWB) of the touch control panel, which activates an operational state that is equivalent to the oven door being closed.
  2. Connect an external power source to the power input terminal of the touch control panel, then it is possible to check and repair the controls of the touch control panel.
  3. It is also possible to check the sensor-related controls of the touch control panel by using the dummy resistor(s).

What tools are required to service the touch control panel assembly?

  1. Soldering iron: 30W (It is recommended to use a soldering iron with a grounding terminal).
  2. Oscilloscope: Single beam, frequency range: DC-10MHz type or more advanced model.
  3. Others: Hand tools.

What are some other precautions to take when servicing the touch control panel?

  1. Before turning on the power source of the control unit, remove the aluminum foil applied for preventing static electricity.
  2. Connect the connectors of the key unit to the control unit being sure that the lead wires are not twisted.
  3. After aluminum foil is removed, be careful that abnormal voltage due to static electricity etc. is not applied to the input or output terminals.
  4. Attach connectors, electrolytic capacitors, etc. to PWB, making sure that all connections are tight.
  5. Be sure to use specified components where high precision is required.

How do you remove the outer case?

  1. Disconnect the power supply cord.
  2. Open the oven door and block it open.
  3. Remove the two (2) screws from the lower portion of the rear cabinet using a T20H Torx type or GTXH20-100 screw driver.
  4. Remove the remaining two (2) screws from rear and four (4) screws along the right side of outer case.
  5. Slide the entire outer case back out about 1 inch (3 cm) to free it from retaining clips on the cavity face plate.
  6. Lift entire outer case from the unit.

What should you do to prevent an electric shock?

  1. Before wiring:
    • Disconnect the power supply cord.
    • Open the door and block it open.
    • Discharge the high voltage capacitor and wait for 60 seconds.
  2. Don’t let the wire leads touch to the following parts:
    • High voltage parts: Magnetron, High voltage transformer, High voltage capacitor and High voltage rectifier assembly.
    • Hot parts: Oven lamp, Magnetron, High voltage transformer and Oven cavity.
    • Sharp edge: Bottom plate, Oven cavity, Waveguide flange, Chassis support and other metallic plate.
    • Movable parts (to prevent a fault) Fan blade, Fan motor, Switch, Switch lever, Open button.
  3. Do not catch the wire leads in the outer case cabinet.
  4. Insert the positive lock connector until its pin is locked and make sure that the wire leads do not come off even if the wire leads are pulled.
  5. To prevent an error function, connect the wire leads correctly, referring to the Pictorial Diagram.

What are some things to check before operating the oven?

  1. Make sure that a definite “click” can be heard when the microwave oven door is unlatched. (Hold the door in a closed position with one hand, then push the door open button with the other, this causes the latch leads to rise, it is then possible to hear a “click’ as the door switches operate).
  2. Visually check the door and cavity face plate for damage (dents, cracks, signs of arcing etc.).
  3. Carry out any remedial work that is necessary before operating the oven.
  4. Do not operate the oven if any of the following conditions exist:
    • Door does not close firmly.
    • Door hinge, support or latch hook is damaged.
    • The door gasket or seal is damaged.
    • The door is bent or warped.
    • There are defective parts in the door interlock system.
    • There are defective parts in the microwave generating and transmission assembly.
    • There is visible damage to the oven.
  5. Do not operate the oven:
    • Without the RF gasket (Magnetron).
    • If the wave guide or oven cavity are not intact.
    • If the door is not closed.
    • If the outer case (cabinet) is not fitted.

How do you remove the power transformer?

  1. Disconnect the power supply cord and then remove outer case.
  2. Open the oven door and block it open.
  3. Discharge high voltage capacitor.
  4. Disconnect wire leads (primary and high voltage) from power transformer and the filament leads from the magnetron and capacitor terminals.
  5. Remove four (4) screws holding transformer to bottom plate.
  6. Remove transformer from bottom plate.

How do you re-install the power transformer?

  1. Rest transformer on the bottom plate with its primary terminals toward the oven face plate.
  2. Secure transformer with four screws to bottom plate.
  3. Re-connect wire leads (primary and high voltage) to power transformer and filament leads of transformer to magnetron and high voltage capacitor.
  4. Re-install outer case and check that oven is operating properly.

How do you remove the high voltage rectifier and high voltage capacitor?

  1. Disconnect the power supply cord and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Disconnect the high voltage wire A from the high voltage capacitor.
  5. Disconnect the high voltage wire of high voltage rectifier assembly from the magnetron.
  6. Disconnect the filament lead (short one) of the power transformer from the high voltage capacitor.
  7. Remove one (1) screw holding capacitor holder with the high voltage rectifier to the base plate.
  8. Disconnect rectifier terminal from capacitor. High voltage rectifier assembly is now free.
  9. Remove capacitor holder. Capacitor is now free.

CAUTION: WHEN REPLACING HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR, GROUND SIDE TERMINAL OF THE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY WITH A GROUNDING SCREW

How do you remove the magnetron?

  1. Disconnect the power supply cord and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Disconnect wire leads from magnetron.
  5. Remove the two (2) screws holding the chassis support to the magnetron and the oven cavity front flange.
  6. Slide the magnetron duct slightly so that the two (2) screws at left hand side of the magnetron appear.
  7. Carefully remove the four (4) screws holding magnetron to waveguide flange.
  8. Remove the magnetron with care so that the magnetron antenna is not hit by any metal object around the antenna.
  9. Now, the magnetron is free.

How do you re-install the magnetron?

  1. Re-install the magnetron to waveguide flange with care to prevent damage to the magnetron antenna.
  2. Secure the magnetron with the four (4) screws.
  3. Hold the chassis support to the oven cavity front plate and the magnetron with the two (2) screws.
  4. Reconnect the wire leads to the magnetron.
  5. Re-install outer case and check that the oven is operating properly.

CAUTION: WHEN REPLACING MAGNETRON, BE SURE THE R.F. GASKET IS IN PLACE AND MOUNTING SCREWS ARE TIGHTENED SECURELY

How do you remove a positive lock connector?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Push the lever of positive lock® connector.
  5. Pull down on the positive lock® connector.

CAUTION: WHEN CONNECTING THE POSITIVE LOCK® CONNECTORS TO THE TERMINALS, CONNECT THE POSITIVE LOCK® SO THAT THE LEVER FACES YOU

How do you remove the control panel assembly?

  1. Disconnect the power supply cord and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Disconnect the wire leads from panel components.
  5. Remove the one (1) screw holding the control panel assembly to the oven cavity front plate.
  6. Slide the control panel assembly upward and remove it.
  7. Now, individual components can be removed.

Note:

  1. Before attaching a new key unit, wipe off remaining adhesive on the control panel frame surfaces completely with a soft cloth soaked in alcohol.
  2. When attaching the key unit to the control panel frame, adjust the upper edge and right edge of the key unit to the correct position of control panel frame.
  3. Stick the key unit firmly to the control panel frame by rubbing with soft cloth so not to scratch.

How do you remove the turntable motor?

  1. Disconnect the power supply cord.
  2. Remove turntable and turntable support from oven cavity.
  3. Lay the oven on its backside. Remove the turntable motor cover by snipping off the material in four corners.
  4. Where the corners have been snipped off bend corner areas flat. No sharp edges must be evident after removal of the turntable motor cover.
  5. Disconnect wire leads from turntable motor.
  6. Remove one (1) screw holding turntable motor to oven cavity.
  7. Now the turntable motor is free.
  8. After replacement use the one (1) screw to fit the turntable motor cover.

How do you remove the oven lamp and lamp socket?

  1. Disconnect the power supply cord and remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Remove the oven lamp from the oven lamp socket.
  5. Pull the wire leads from the oven lamp socket by pushing the terminal hole of the oven lamp socket with the small flat type screw driver.
  6. Remove the oven lamp socket from the magnetron duct by turning the socket counterclockwise.
  7. Remove the oven lamp from the socket by turning the oven lamp.
  8. Now, the oven lamp and the oven lamp socket are free.

How do you remove the cooling fan motor?

  1. Disconnect the power supply cord and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Disconnect the wire leads from the fan motor.
  5. Remove the two (2) screws holding the fan motor to the oven cavity back plate.
  6. Remove the fan blade from the fan motor shaft.
  7. Hold the edge of the rotor of the fan motor by using a pair of groove joint pliers.

CAUTION:

  • Make sure that no metal pieces enter the gap between the rotor and the stator of the fan motor because the rotor is easily shaven by pliers and metal pieces may be produced.
  • Do not touch the pliers to the coil of the fan motor because the coil may be cut or damaged.
  • Do not disfigure the bracket by touching with the pliers.
  1. Remove the fan blade from the shaft of the fan motor by pulling and rotating the fan blade with your hand.
  2. Now, the fan blade and the fan motor will be free.

CAUTION: Do not reuse the removed fan blade because the hole (for shaft) may be larger than normal.

How do you install the fan blade?

  1. Install the fan blade to the fan motor shaft.
  2. Hold the center of the bracket which supports the shaft of the fan motor on the flat table.
  3. Apply the screw lock tight into the hole (for shaft) of the fan blade.
  4. Install the fan blade to the shaft of fan motor by pushing the fan blade with a small, light weight, ball peen hammer or rubber mallet.

CAUTION:

  • Do not hit the fan blade hard when installing because the bracket may be damaged.
  • Make sure that the fan blade rotates smoothly after installation.
  • Make sure that the axis of the shaft is not slanted.
  1. Install the fan motor to the the oven cavity back plate with the two (2) screws.
  2. Connect the wire leads to the fan motor, referring to the pictorial diagram.

How do you remove the door sensing switch, secondary interlock switch, and monitor switch?

  1. Disconnect the power supply cord and remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Disconnect wire leads from the switches.
  5. Remove two (2) screws holding latch hook to oven flange.
  6. Remove latch hook assembly from oven flange.
  7. Push outward on the two (2) retaining tabs holding switch.
  8. Switch is now free. At this time switch lever will be free, do not lose it.

How do you re-install the door sensing switch, secondary interlock switch, and monitor switch?

  1. Re-install each switch in its place. The secondary interlock/monitor switches are in the lower position and the door sensing switch is in the upper position.
  2. Re-connect wire leads to each switch.

How do you remove the AH sensor?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Remove the two (2) screws holding the AH sensor to the sensor duct.
  5. Disconnect the AH sensor harness from the connector CN-F on control unit.
  6. AH sensor is now free.

How do you install the AH sensor?

  1. Insert the new AH sensor into the sensor duct.
  2. Install two (2) screws to secure the AH sensor.
  3. Route the AH sensor harness across the oven cavity top plate and through the large opening.
  4. Connect the AH sensor harness to CN-F on control unit.
  5. Re-install the outer case cabinet and check for proper operation.

How do you adjust the door switches?

  1. Disconnect the power supply cord, and then remove outer case.
  2. Open the door and block it open.
  3. Discharge high voltage capacitor.
  4. Loosen the two (2) screws holding latch hook to the oven cavity front flange.
  5. With door closed, adjust latch hook by moving it back and forth, and up and down. In and out play of the door allowed by the upper and lower position of the latch hook should be less than 0.5mm. The vertical position of the latch hook should be adjusted so that the door sensing switch and secondary interlock switch are activated with the door closed. The horizontal position of the latch hook should be adjusted so that the plunger of the monitor switch is pressed with the door closed.
  6. Secure the screws with washers firmly.
  7. Check the operation of all switches.
  8. If each switch has not activated with the door closed, loosen screw and adjust the latch hook position.

After adjustment, check the following:

  1. In and out play of door remains less than 0.5mm when in the latched position. First check upper position of latch hook, pushing and pulling upper portion of door toward the oven face. Then check lower portion of the latch hook, pushing and pulling lower portion of the door toward the oven face. Both results (play in the door) should be less than 0.5mm.
  2. The door sensing switch and secondary interlock switch interrupt the circuit before the door can be opened.
  3. Monitor switch contacts close when door is opened.
  4. Re-install outer case and check for microwave leakage around door with an approved microwave survey meter.

How do you remove the door?

  1. Disconnect the power supply cord.
  2. Push the open button and open the door slightly.
  3. Insert a putty knife (thickness of about 0.5mm) into the gap between the choke cover and door frame to free engaging parts.
  4. Pry the choke cover by inserting a putty knife.
  5. Release choke cover from door panel.
  6. Now choke cover is free.
  7. Release two (2) pins of door panel from two (2) holes of upper and lower oven hinges by lifting up.
  8. Now, door panel with door frame is free from oven cavity.
  9. Release the door panel from twelve (12) tabs of door frame.
  10. Remove the door panel from the door frame.
  11. Now, door panel with sealer film is free.
  12. Tear sealer film from door panel.
  13. Now, door panel is free.
  14. Slide latch head upward and remove it from door frame with releasing latch spring from door frame and latch head.
  15. Now, latch head and latch spring are free.
  16. Remove door screen from door frame.
  17. Now, door frame is free.

How do you re-install the door?

  1. Re-install door screen to door frame.
  2. Re-install the latch spring to the latch head. Re-install the latch spring to the door frame. Re-install latch head to door frame.
  3. Re-install door panel to door frame by fitting twelve (12) tabs of door frame to twelve (12) holes of door panel.
  4. Put sealer film on door panel.
  5. Secure latch hook (with two (2) mounting screws) to oven flange.
  6. Make sure that the monitor switch is operating properly and check continuity of the monitor circuit.
  7. Re-install choke cover to door panel by pushing.

What should you check after any service to the door?

(A) Make sure that door sensing switch and secondary interlock switch are operating properly. (B) An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards.

What are some things to make sure of after any service?

  1. Door latch heads smoothly catch latch hook through latch holes and that latch head goes through center of latch hole.
  2. Deviation of door alignment from horizontal line of cavity face plate is to be less than 1.0mm.
  3. Door is positioned with its face pressed toward cavity face plate.
  4. Check for microwave leakage around door with an approved microwave survey meter.

What does the sealer film do and how do you install it?

The door on a microwave oven is designed to act as an electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle.

Installation:

  1. Put the adhesive tape on the backing film of the sealer film.
  2. Tear the backing film by pulling the adhesive tape.
  3. Put the pasted side of the sealer film on the door panel.

CLICK HERE TO DOWNLOAD SHARP R-519CK (01) PDF MANUAL

This Post Has One Comment

  1. Donna July 2, 2022 Reply

    Thanks, but I need a user manual for this microwave please/

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