PURITAN BENNETT 7202 (01) PDF DOCUMENT

The PURITAN BENNETT 7202 Display supplements the 7200® Series Ventilator’s message display window by providing:

• An enhanced view of ventilator messages.

• Detailed readouts of patient data, ventilator settings, and status.

• Visibility of ventilator condition messages from a range of angles and distances.

The display uses a series of interactive screens to report on ventilator status and respond to operator actions. It is installed on a swivel arm assembly that can be adjusted for maximum visibility and communicates with the 7200 Series Ventilator via a cable that connects to the DISPLAY port on the back panel of the ventilator.

Yes, there are two versions of the PURITAN BENNETT 7202 Display.

The current version was designed for use with the 7200ae or 7200a Ventilator and includes a rear switch for setting the display to work with either ventilator.

An earlier version has no external switch. The early version can work with the 7200a or 7200ae, but you must set an internal jumper accordingly. Also, to use the 7200ae Graphics option, you must first install a compatibility kit (P/N 4-017180-00) on the display with no external switch.

Screen	24 line, 80 characters per line 512 x 256 pixel matrix Pixel size 0.011 inches square Pixel luminance 25 ft-Lamberts at square Display color yellow-orange centered at 585 nm
Operating voltages	5 V dc at 1 A and 12 V dc at 0.85 A
Total power consumption	25 W
Display interface	RS-232C serial interface, asynchronous.
Data format (display with rear switch)	19,200 baud, 1 start bit, 8 data bits, 1 stop bit, no parity.
Data format (display with no external switch)	9600 baud, 1 start bit, 8 data bits, 1 stop bit, no parity.
Active display area	19.69 cm (7.68 inches) wide, 9.85 cm (3.84 inches) high
Approximate weight	Display with rear switch: 3.2 kg (7 lb) Display with no external switch: 5 kg (11 lb)
Temperature	Operating: 16 to 41° C (60 to 105° F) Storage: -34 to 71° C (-30 to 160° F)
Operational testing	A self-test mode (switch-selectable in the rear switch version, and jumper-selectable in the display with no external switch) displays several patterns in a repeating sequence (all input is ignored).

You will need these tools to service the display:

• Small standard screwdriver

• Small phillips screwdriver

• Small nose pliers

• Snap ring pliers

• Hex screwdriver set

• Static-dissipative service kit (P/N 4-018149-00) or equivalent (static-dissipative mat, ground cord, and wrist strap)

• Conductive bags

• Digital multimeter accurate to three decimal places

Use a damp cloth and mild detergent to clean the display. Take care not to scratch the image area. Dry thoroughly.

CAUTION: To avoid damage to the display, do not autoclave, use a liquid bactericide, scrub with abrasive cleaners, or allow liquid to penetrate the display or ventilator.

CAUTION: Never connect or disconnect the 7202 Display from the ventilator while the ventilator is operating. If the ventilator is not turned off, a momentary loss of power to the pneumatic assembly could result, and could start back up ventilation (BUV) mode or damage the display.

1. Run Total EST on the 7200 Series Ventilator. Performing TEST is recommended so if TEST fails after the display is reinstalled, the source of the problem can be easily identified and corrected.

2. Turn off the ventilator. Detach the display cable from the DISPLAY port on the back of the ventilator.

3. Unscrew the display knob and remove the display from the ventilator. Place the display face down on a flat surface for disassembly/assembly. Take care not to scratch the image area.

CAUTION: To protect electrostatic-sensitive equipment, service personnel must use a static-dissipative service kit and must follow all electrostatic discharge (ESD) procedures and precautions before servicing the display.

CAUTION: To prevent unnecessary PCB repair, do not pull on the display cable with excessive force. Do not pry the rear housing open with a screwdriver or any other instrument.

For displays with a rear switch:

Removal:

1. Remove the external display cable from the rear of the display.

2. Remove the four screws and washers from the rear housing.

3. Separate the front housing from the rear housing by pulling on the front handle. If they don’t come apart readily, try pulling gently on the corners of the housing first.

4. Remove the internal harness assembly from the rear housing. Remove the rear housing and set aside.

Replacement:

1. Once the internal harness assembly is attached to the PCB connectors, reconnect the other end of the harness to the rear housing.

2. Set the front housing flat on a surface that won’t scratch the window (this is easiest to do with the handle hanging off the edge of the surface).

3. Make sure that the gasket is firmly seated in the recess around the edge of the rear housing. To attach the front and rear housings, it is easiest to “fold” the internal harness between the two fuses, then press the housings together (make sure that the harness is not “pinched” by the housings).

4. Use a thin screwdriver to align the screw holes in the new rear housing, the brackets, and the front housing. Reinstall the four screws and washers into the rear housing.

For displays with no external switch:

Removal:

1. Remove the seven screws from the rear housing.

2. Separate the rear housing from the front housing by pulling up gently on the display cable. Remove the rear housing and set aside.

Replacement:

1. Once the display cable is attached to the PCB connectors, position the ground wire (the bare silver filaments on the display cable) against the groove in the handle.

2. Reinstall the rear housing, pressing it down until it seats firmly in the front housing.

3. Replace the seven screws in the rear housing and tighten until snug.

WARNING: To prevent electrical shock or damage to the display PCB assembly, disconnect the display from the ventilator (when the ventilator is turned off) and allow the unit to sit for two minutes to allow the capacitors to discharge before servicing the PCB assembly.

CAUTION: Follow these precautions when handling PCBs: Do not touch PCB connector ends. Acids on fingers can cause corrosion and subsequent equipment malfunction. When removing any of the PCBs, use a properly grounded mat and wrist strap. Store PCBs in conductive bags to protect them.

Disassembly Steps:

1. Remove the rear housing.

2. Label and disconnect the cable from connectors J1, J4, J6, and J7 on the PCB assembly. For displays with a rear switch, also label and disconnect the cable from the E1-E8 jumper block.

3. For displays with no external switch: Remove the four screws that hold the PCB assembly to the front housing.

4. Lift the PCB assembly out of the front housing and place on a static-dissipative mat.

Removing Individual PCBs:

• Piggyback PCB: Squeeze the tops of the three standoffs with pliers and lift up on the piggyback PCB. Pull straight up so the stake connector pins do not bend.

• Power Supply PCB: Remove the interconnect cable. Gently lift the sides of the ribbon cable latch and pull the ribbon cable straight out. Remove the four screws, four spacers, and four nuts holding it to the controller PCB.

• Controller PCB: Remove the ribbon cable and interconnect cable. Remove the four screws and spacers securing it to the electroluminescent PCB. Lift the controller PCB off.

• Electroluminescent PCB: Lift the two ribbon cable latches (by hand or with a screwdriver). Pull each ribbon cable straight out. For displays with rear switches, remove the four screws and lockwashers holding the two brackets.

NOTE: The controller and piggyback PCBs are a matched set. The electroluminescent and power supply PCBs are a matched set. If you replace one board in a set, you must replace both boards with another matched set.

Electroluminescent PCB:

1. Fold the ribbon cables to reach their latches. Ensure the connective “fingers” are facing up.

2. Insert the cable ends into the latches and press the latches down to snap them into place.

3. For displays with a rear switch: Position the two brackets (pem nuts facing down) on either side of the electroluminescent PCB and attach them with four screws and lockwashers.

Controller PCB:

1. Thread the ribbon cables through the toroids on the underside of the controller PCB.

2. Position the four long spacers on the electroluminescent PCB.

3. Place the controller PCB on the spacers, aligning the holes.

4. Insert the four long screws and tighten until snug.

5. Insert the ribbon cable into the connector on the controller PCB, ensuring the connective fingers face the bottom of the PCB assembly. Seat it securely and press the latch to close.

Power Supply PCB:

1. Position the four spacers over the holes on the controller PCB.

2. Place the power supply PCB over the spacers.

3. Align the holes and insert the screws.

4. From underneath, install a nut onto each screw and tighten.

5. Insert the ribbon cable into the latch on the power supply PCB, ensuring the fingers face your right. Press the latch into place.

6. Reinstall the interconnect cable between the controller and power supply PCBs.

Piggyback PCB:

Align the piggyback PCB with the three standoffs and carefully align its stake connector pins with the sockets on the controller PCB. Press down until the board snaps into place.

Final PCB Assembly Installation:

1. Reconnect the internal harness (for displays with rear switch) or the display cable (for displays with no external switch).

2. Replace the PCB assembly in the front housing with cable connectors closest to the top.

3. For displays with no external switch: Insert the four screws that hold the assembly to the front housing and tighten until snug.

4. Replace the rear housing.

Disassembly (With Rear Switch):

1. Remove the four screws that hold the swivel arm assembly to the rear housing.

2. Separate the bottom plate and swivel arm assembly from the rear housing.

Disassembly (No External Switch):

1. Remove the rear housing and the PCB assembly.

2. From inside the front housing, remove the four screws holding the handle and swivel arm assembly.

3. Separate the handle from the swivel arm assembly by pulling the two sections apart.

Disassembling the Swivel Arm Components:

1. Use snap-ring pliers to open and remove the retaining ring.

2. Remove the washer.

3. Pull out the knob.

4. Pull out the sleeve.

Reassembly (Attaching the Knob):

1. From underneath the swivel arm, slide the sleeve into the hole.

2. Insert knob into the top of the hole.

3. Slide washer onto knob.

4. Use snap-ring pliers to replace retaining ring.

Reassembly (With Rear Switch):

1. Fasten the spring assembly to the swivel arm assembly with a screw and washer.

2. Position the spring assembly and bottom plate under the rear housing so the bevel faces the back. Secure with screws and washers.

Reassembly (No External Switch):

1. Position the spring assembly over the bottom plate and secure with a 9/64-inch hex screwdriver.

2. Insert the swivel arm into the bottom plate so the bevel faces the back.

3. Fasten the spring assembly, bottom plate, and swivel arm with a #10 screw and washer.

4. Align the handle and swivel arm assembly and press together.

5. Align the assembly with the front housing and tighten the four screws to secure it.

Final Reassembly:

1. Place the PCB assembly in the front housing and reinstall it.

2. Replace the rear housing.

If no cursor appears on the display, perform the following steps in order. CAUTION: Turn the ventilator off before disconnecting or connecting the display.

1. Check Ventilator Configuration: Ensure your ventilator (7200a or 7200ae) is equipped with the correct hardware and software for the display. The ventilator must have a DISPLAY port and be configured correctly.

2. Check Ventilator Switch Settings: Turn the ventilator off and remove the top panels. Set switches S1, S2, and S3 on the memory PCB (7200a) or DCI/display controller PCB (7200ae) to the correct positions for display operation.

3. Check that DISPLAY Port is Functioning: Use a known operational display or a printer with a jumper plug to verify the ventilator’s DISPLAY port is working.

4. Check DCI Port Configurations (if applicable): Use the Digital Communications Interface (DCI) option (function 22) to check the configuration of the PRINTER and DIGITAL OUTPUT ports to ensure they are set up correctly.

5. Check Display Cable Connections: Verify the cable is properly connected to the DISPLAY port on the ventilator and to connectors J1, J4, J6, and J7 on the display’s PCB assembly. Check cable fuses with a digital multimeter.

6. Check the Test Screens: Put the display into self-test mode to see if it generates patterns. If any part of the test screen is missing, recheck all internal cable connections.

7. Check Display Power Supply Voltages: If the above steps fail, disassemble the display and check the internal power supply voltages at the specified test points.

1. Turn the ventilator off.

2. Activate test mode:

• For displays with a rear switch: Set the switch at the back of the display to the “T” position.

• For displays with no external switch: Open the display and move the jumper on the controller PCB from position E3 to position E7.

3. Make sure the brown cable connector is attached to J1 on the controller PCB, and the display cable is attached to the DISPLAY port on the back of the ventilator.

4. Turn the ventilator on. A series of test patterns should appear on the display screen. The patterns include: normal-intensity filled-in screen, screen off, vertical lines “walking” across the screen, reverse-video vertical lines “walking” across the screen, and lower-intensity filled-in screen. The test patterns will display continuously until the ventilator is turned off.

5. If any part of any test screen is missing, recheck all cable connections (ribbon cables, interconnect cable, and display cable). If this does not resolve the problem, continue with troubleshooting procedures.

6. To exit test mode, turn off the ventilator. Return the switch to the “a” or “ae” position (for displays with rear switch), or move the jumper back to position E3 (for displays with no external switch).

WARNING: To prevent electric shock, use proper precautions while testing, and avoid touching the test points yourself. The voltages across the capacitor or between ground and stake connector pin 1 are high (230 V dc).

Perform the complete voltage test in the sequence shown in the table to ensure proper fault isolation.

Test Point (Early Version Power Supply PCB)	Test Point (Current Version Power Supply PCB)	Correct Voltage	Corrective Action (if voltage is not present)
Brown connector on display cable. Negative: brown wire. Positive: red wire.	Brown connector on display cable. Negative: brown wire. Positive: red wire.	4.75-5.25 V	Display with rear switch: Replace the internal display cable; if the problem is not resolved, replace the external display cable. Display with no external switch: Replace the display cable.
Brown connector on display cable. Negative: orange wire. Positive: yellow wire. (Re-attach connector to J1 on controller PCB.)	Brown connector on display cable. Negative: orange wire. Positive: yellow wire. (Re-attach connector to J1 on controller PCB.)	11.4-12.6 V	Display with rear switch: Replace the internal display cable; if the problem is not resolved, replace the external display cable. Display with no external switch: Replace the display cable.
Interconnect cable at power supply PCB. Negative and positive: one at each socket.	Interconnect cable at power supply PCB. Negative and positive: one at each socket.	11.4-12.6 V	Replace the controller PCB.
Fusible link (if present). Negative: GND. Positive: top wire.	Power supply fuse. Negative: GND. Positive: top wire.	11.4-12.6 V	Replace electroluminescent PCB (which also includes power supply PCB).
Fusible link (if present). Negative: GND. Positive: bottom wire.	Power supply fuse. Negative: GND. Positive: bottom wire.	11.4-12.6 V	Verify voltage from interconnect cable. If that voltage is correct, replace electroluminescent PCB.
Transistor screws. Negative: GND. Positive: across tops of screws.	Power supply fuse. Negative: GND. Positive: top of transistor.	11.4-12.6 V	Verify interconnect cable voltage. If that voltage is correct, replace electroluminescent PCB.
Capacitor. Negative: inside wire. Positive: outside wire.	Stake connector. Negative: GND. Positive: stake connector pin 1.	199-242 V	Verify correct voltages at fusible link and transistor screws or power supply fuse and transistor. If those voltages are correct, replace the electroluminescent PCB.

Follow these steps:

1. Ensure the switch (for displays with a rear switch) or jumpers (for displays with no external switch) on the controller PCB are set correctly for the ventilator model (7200a or 7200ae).

2. Check all connections at the PCB assembly connectors, the ventilator DISPLAY port, and (if applicable) the internal harness connections to the rear housing. Ensure all pins are properly inserted in the connector shell.

3. If the cable is properly connected but there is still no communication, replace the display cable.

4. If there is still no communication, replace the electroluminescent PCB assembly (which includes the power supply PCB).

5. If the problem persists, replace the controller PCB assembly (which includes the controller and piggyback PCBs).

6. If the ventilator still doesn’t communicate with the display, follow the full troubleshooting steps for “No Cursor”.

NOTE: The electroluminescent/power supply PCBs and the controller/piggyback PCBs are matched sets. If you replace one board in a set, you must replace both boards.

Follow these steps:

1. Verify that the printer is supplied with paper and a cartridge, is plugged in, turned on, and on-line.

2. Verify that the printer cable is properly connected to the PRINTER port on the ventilator back panel.

3. Verify that the switches on the ventilator’s memory PCB (7200a) or DCI/display controller PCB (7200ae) are set correctly for printer operation.

4. Use the printer’s self-test to check that it is working properly. Press and hold the line feed button, then turn on the printer while holding it. Release the button; the printer should print a self-test pattern. If it does not, the printer has malfunctioned and requires service.

5. Verify that the display cable is connected properly to the DISPLAY port on the ventilator.

6. For 7200a Ventilators only: Bypass the display by installing a jumper plug (P/N 4-018143-00) into the DISPLAY port. If the printer works, the issue is with the display.

7. Verify that the display cable is properly connected to the PCB assembly connectors inside the display. Ensure all pins are properly inserted in the connector shell.

8. If the problem persists, replace the electroluminescent PCB assembly (which also includes the power supply PCB).

Follow these steps:

1. Verify that the display cable is connected properly to the PCB assembly connectors. Ensure that all pins are properly inserted in the connector shell.

2. Verify that the rear switch is set correctly (for displays with the rear switch), or that the jumpers on the controller PCB are set correctly (for displays with no external switch).

3. Verify that the screen template EPROM (socket U17 on the controller PCB) is seated properly in its socket.

4. If the EPROM is seated properly but the problem remains, replace the EPROM.

5. If the above steps do not resolve the problem, replace the electroluminescent PCB assembly (this assembly also includes the power supply PCB).

6. If the problem remains, replace the controller PCB assembly (this includes both the controller and piggyback PCBs).

Follow these steps if the screen shows “snow,” missing segments, bright or dim lines or spots, “ghost” images, or fluctuating displays:

1. Verify that the display cable is connected properly to the PCB assembly connectors and that all pins are properly inserted in the connector shell.

2. Verify that the internal ribbon cables and the interconnect cable are properly connected between the electroluminescent, controller, and power supply PCBs. Even if the cables appear secure, remove and resecure them. Check that conductive fingers on the ribbon cables are facing in the proper direction.

3. Replace the electroluminescent PCB assembly (this is a field-replaceable unit that includes both the electroluminescent and the power supply PCBs).

4. If the issue persists, replace the controller PCB assembly (this field-replaceable unit includes both the controller and piggyback PCBs).

NOTE: The electroluminescent/power supply PCBs and the controller/piggyback PCBs are matched sets. If you must replace one board in a set, replace both boards with another matched set to ensure proper display operation.

If the screen is delaminating, replace the front housing.

Item Number (Figure 4-1)	Part Number	Description
	4-018470-00	7202 Display (English)
	4-018471-00	7202 Display (Spanish)
	4-018472-00	7202 Display (Italian)
	4-018473-00	7202 Display (French)
	4-018474-00	7202 Display (German)
1	4-018252-00	Assembly, front housing
2	4-018251-00	Assembly, rear housing (includes gasket, item 14)
3	4-006285-00	Screw, pan head, 8-32 x 1 5/8, stainless steel
4	4-006666-00	Washer, flat, #8, stainless steel
5		PCB assembly (Figure 4-3)
6	4-018299-00	Swivel arm assembly (Figure 4-4)
7	4-006504-00	Screw, pan head, 8-32 by 7/16, zinc-plated
8	4-007299-00	Lockwasher, #8, stainless steel
9	4-017128-00	Cable, display, internal (includes items 15-20)
10	4-017129-00	Cable, display, external
11	4-018254-00	Spring assembly
12	4-018776-00	Bracket
13	4-018775-00	Bottom plate
14	4-040314-00	Gasket, 0.04 D, silicone rubber
15	4-018777-00	Connector plate
16	4-019152-00	Screw lock assembly, female
17	4-008373-00	Nut, hex, 2-56, stainless steel
18	4-008374-00	Lockwasher, #2, stainless steel
19	4-008372-00	Screw, flat head, 2-56 x 1/4, stainless steel
20	4-025123-00	Fuse, 2A, ceramic

Item Number (Figure 4-2)	Part Number	Description
	—	7202 Display (English)
		7202 Display (Spanish)
		7202 Display (Italian)
		7202 Display (French)
		7202 Display (German)
		(To order a complete new display, order display with rear switch. See Table 4-1.)
1	—	Assembly, front housing (Not stocked as a separate replacement part. Order an Upgrade Kit P/N 4-018353-00.)
2	4-018184-00	Assembly, rear housing
3	4-009423-00	Screw, pan head, 6-32 by 7/8, zinc-plated
4	—	PCB assembly (Figure 4-3)
5	4-000143-00	Screw, pan head, 8-32 by 1/2, zinc-plated
6	4-018299-00	Swivel arm assembly (Figure 4-4)
7	4-002671-00	Screw, pan head, 8-32 by 1 1/4, zinc-plated
8	4-018438-00	Handle
9	4-025121-00	Cable, display
10	4-018298-00	Spring assembly
11	4-025123-00	Fuse, 2A, ceramic

Item Number (Figure 4-3)	Part Number	Description
1	—	PCB assembly
	4-018420-00	PCB, electroluminescent
	4-018196-00	PCB, electroluminescent (exchange)
2	—	PCB, power supply (Not stocked as a separate replacement part. Order an electroluminescent PCB, item 1.)
3	—	Cables, ribbon (Not stocked as separate replacement parts. Order an electroluminescent PCB, item 1.)
4	4-006287-00	Spacer, round, 1/4 D, 0.140 ID, 1 L (rear switch)
	4-009693-00	Spacer, round, 1/4 D, 0.140 ID, 1/2 L (no external switch)
5	4-007035-00	Screw, pan head, 4-40 by 1.5, zinc-plated (rear switch)
	4-009891-00	Screw, pan head, 4-40 by 1, zinc-plated (no external switch)
6	4-018421-00	PCB, controller
	4-018197-00	PCB, controller (exchange)
7	—	PCB, piggyback (Not stocked as a separate replacement part. Order a controller PCB, item 6.)
8	—	Cable, interconnect (Not stocked as a separate replacement part. Order a controller PCB, item 6.)
9	4-009877-00	Screw, pan head, 4-40 by 3/8, zinc-plated
10	4-006299-00	Spacer, round, 1/4 D, 0.115 ID, 1/8 L
11	4-000780-00	Nut, machine screw, 4-40, zinc-plated
12	4-018154-00	Standoff, locking, 6/6, nylon
13	4-018480-00	EPROM, screen template (English) (U17)
	4-018481-00	EPROM, screen template (Spanish) (U17)
	4-018482-00	EPROM, screen template (Italian) (U17)
	4-018483-00	EPROM, screen template (French) (U17)
	4-018484-00	EPROM, screen template (German) (U17)
14	4-025116-00	Toroid, flat (Use double-sided tape P/N 4-004975-00, to fasten to underside of controller PCB.)
15	4-025116-00	Toroid, flat (Use double-sided tape P/N 4-004975-00 to fasten to underside of controller PCB.)
16	4-025117-00	Toroid, cable shield
17	4-018776-00	Bracket (rear switch version only)
18	4-002907-00	Screw, pan head, 6-32 x 3/8, stainless steel (rear switch version only)
19	4-007943-00	Lockwasher, #6, stainless steel (rear switch version only)
20	4-008107-00	Lockwasher, #4, stainless steel (rear switch version only)
21	4-018478-03	EPROM, main software (all languages) (U19)