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What are the power requirements for the SONY TCM-450DV?
The power requirements for the SONY TCM-450DV are 3 V DC, using two R03 (AAA) batteries, or an external DC 3 V power source.
What is the tape speed for the SONY TCM-450DV?
The tape speed for the SONY TCM-450DV is 4.8 cm/s (1 7/8 ips) or 2.4 cm/s (15/16 ips).
What is the variable range of the tape speed for the SONY TCM-450DV?
The variable range of the tape speed for the SONY TCM-450DV is from approximately +30% to -20% when the REC TIME/PLAY MODE switch is set to “NORMAL”.
What is the frequency range for the SONY TCM-450DV using a normal (TYPE I) cassette with the REC TIME/PLAY MODE switch at “NORMAL”?
The frequency range for the SONY TCM-450DV using a normal (TYPE I) cassette with the REC TIME/PLAY MODE switch at “NORMAL” is 250 – 6,300 Hz.
What is the required sensitivity for the microphone input jack on the SONY TCM-450DV?
The sensitivity required for the microphone input jack (minijack/monaural/PLUG IN POWER) on the SONY TCM-450DV is 0.2 mV for a 3 kΩ or lower impedance microphone.
What is the power output at 10% harmonic distortion for the SONY TCM-450DV earphone jack?
The power output at 10% harmonic distortion for the earphone jack (minijack/monaural) for an 8 – 300 Ω earphone on the SONY TCM-450DV is 450 mW.
What are the dimensions (w/h/d) of the SONY TCM-450DV including projecting parts and controls?
The dimensions (w/h/d) of the SONY TCM-450DV including projecting parts and controls are approximately 86.3 x 113.4 x 28.9 mm (3 7/16 x 4 1/2 x 1 3/16 in.).
What is the mass of the main unit only for the SONY TCM-450DV?
The mass of the main unit only for the SONY TCM-450DV is approximately 173 g (6.2 oz.).
What accessory is supplied with the SONY TCM-450DV?
The supplied accessory with the SONY TCM-450DV is one carrying pouch.
What are the procedures for Flexible Circuit Board Repairing when servicing the SONY TCM-450DV?
The procedures for Flexible Circuit Board Repairing when servicing the SONY TCM-450DV are:
Keep the temperature of the soldering iron around 270 °C during repairing.
Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).
Be careful not to apply force on the conductor when soldering or unsoldering.
What are the notes on chip component replacement for the SONY TCM-450DV?
The notes on chip component replacement for the SONY TCM-450DV are:
Never reuse a disconnected chip component.
Notice that the minus side of a tantalum capacitor may be damaged by heat.
What parts should be cleaned when performing Mechanical Adjustments on the SONY TCM-450DV?
The parts that should be cleaned with a denatured-alcohol-moistened swab when performing Mechanical Adjustments on the SONY TCM-450DV are:
record/playback head
erase head
capstan
pinch roller
rubber belt
What torque measurement values are specified for the SONY TCM-450DV for FWD mode using the CQ-102C Torque Meter?
The specified torque measurement values for the SONY TCM-450DV for FWD mode using the CQ-102C Torque Meter are:
| Mode | Torque Meter | Meter Reading |
|---|---|---|
| FWD | CQ-102C | 1.97-3.92mN•m (20-40 g.cm) (0.28-0.55 oz-inch) |
What torque measurement values are specified for the SONY TCM-450DV for Forward Back Tension mode using the CQ-102C Torque Meter?
The specified torque measurement values for the SONY TCM-450DV for Forward Back Tension mode using the CQ-102C Torque Meter are:
| Mode | Torque Meter | Meter Reading |
|---|---|---|
| Forward Back Tension | CQ-102C | 0.05-0.49 mN•m (0.5-5 g.cm) (0.007-0.069 oz-inch) |
What torque measurement values are specified for the SONY TCM-450DV for FF, REW mode using the CQ-201B Torque Meter?
The specified torque measurement values for the SONY TCM-450DV for FF, REW mode using the CQ-201B Torque Meter are:
| Mode | Torque Meter | Meter Reading |
|---|---|---|
| FF, REW | CQ-201B | more than 4.91 mN•m (more than 50 g.cm) (more than 0.69 oz-inch) |
What tape tension measurement value is specified for the SONY TCM-450DV for FWD mode using the CQ-403A Tension Meter?
The specified tape tension measurement value for the SONY TCM-450DV for FWD mode using the CQ-403A Tension Meter is:
| Mode | Tension Meter | Meter Reading |
|---|---|---|
| FWD | CQ-403A | more than 50 g (more than 1.76 oz) |
What are the required settings when performing Tape Speed Adjustment on the SONY TCM-450DV?
The required settings when performing Tape Speed Adjustment on the SONY TCM-450DV are:
Supplied voltage: 2.5 V
VOL control (RV101): mechanical center
PAUSE switch (S301): OFF
SPEED CONTROL (RV201): center click
VOR switch (S501): OFF
What test tape and signal conditions are used for tape speed adjustment on the SONY TCM-450DV?
The test tape and signal conditions used for tape speed adjustment on the SONY TCM-450DV are:
| Type | Signal | Used for |
|---|---|---|
| WS-48A | 3 kHz, 0 dB | tape speed adjustment |
Where 0 dB = 0.775 V.
What is the procedure for Tape Speed Adjustment in playback mode (Normal Speed) on the SONY TCM-450DV?
The procedure for Tape Speed Adjustment in playback mode (Normal Speed) on the SONY TCM-450DV is as follows:
Step 1. Set the REC TIME / PLAY MODE switch (S601) to NORMAL (4.8 cm/s) position, and playback the test tape (WS-48A).
Step 2. Adjust RV601 so that the frequency counter reading becomes 3,000 Hz. The specification values are 2,985 to 3,015 Hz.
What is the procedure for Tape Speed Adjustment in playback mode (Double Speed) on the SONY TCM-450DV?
The procedure for Tape Speed Adjustment in playback mode (Double Speed) on the SONY TCM-450DV is as follows:
Step 1. Set the REC TIME / PLAY MODE switch (S601) to DOUBLE (2.4 cm/s) position.
Step 2. Playback the test tape from the beginning for two minutes, then adjust RV602 so that the frequency counter reading becomes 1,500 Hz. The specification values are 1,493 to 1,507 Hz.
Step 3. Confirm that the deflection of the frequency counter reading between the beginning and the end of the tape is within 2% (NORMAL: approx. 60 Hz, DOUBLE: approx. 30 Hz).
What are the adjustment locations for Tape Speed Adjustment on the MAIN BOARD (Side B) of the SONY TCM-450DV?
The adjustment locations for Tape Speed Adjustment on the MAIN BOARD (Side B) of the SONY TCM-450DV are:
RV601 for Tape Speed Adjustment (Normal Speed).
RV602 for Tape Speed Adjustment (Double Speed).
What are the notes on schematic diagrams for the SONY TCM-450DV?
The notes on schematic diagrams for the SONY TCM-450DV are:
All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.
All resistors are in W and 1/W or less unless otherwise specified.
: B+ Line.
: adjustment for repair.
Power voltage is dc 3V and fed with regulated dc power supply from battery terminal.
Voltages are dc with respect to ground under no-signal conditions.
no mark: PLAY
( ): REC
Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production tolerances.
Circled numbers refer to waveforms.
Signal path. Σ : PB >: REC
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