SECTION 5

ELECTRICAL ADJUSTMENTS

Setting:

Supplied voltage: 2.5 V

Switch and control position

[VOL w] control (RV101) : mechanical center

Tape Speed Adjustment

Mode: playback

test tape

[PAUSE .] switch (S105) : OFF

WS-48A

frequency counter

[SPEED CONTROL](RV602): center click

[VOR] switch (S104)

: OFF

 

Test Tape

 

 

 

 

 

 

 

Type

Signal

 

Used for

 

 

 

P-4-A063

6.3 kHz, –10 dB

Head Azimuth Adjustment

WS-48A

3 kHz, 0 dB

 

Tape Speed Adjustment

 

 

 

 

0 dB=0.775 V

Record/Playback Head Azimuth Adjustment

Mode: playback

test tape

P-4-A063level meter (6.3 kHz, –10 dB)

10 k

+

set

EAR jack (J102)

Procedure:

1.Turn the adjustment screw to obtain the maximum reading on level meter.

Note: Several peaks may appear, but take the maximum.

2.After the adjustment, lock the adjustment screw with suitable locking compound.

Adjustment Location:

adjustment screw

Press the N button.

(3 kHz, 0 dB)

10 k

set

+

 

 

EAR jack (J102)

Procedure:

– Normal Speed –

1.Set [REC TIME] switch (S601) to NORMAL (4.8 cm/s) posi- tion, and playback the tape (WS-48A) .

2.Adjust RV601 so that frequency counter reading becomes 3,040 Hz.

Specification values: 3,030 to 3,050 Hz

– Double Speed –

3.Set [REC TIME] switch (S601) to DOUBLE (2.4 cm/s) posi- tion.

4.Playback the tape from the beginning for two minutes, then adjust RV603 so that frequency counter reading becomes 1,540 Hz.

Specification values: 1,535 to 1,545 Hz

Confirm that deflection of the frequency counter reading between the beginning and the end of tape is within 1% (NORMAL: approx. 30.4 Hz, DOUBLE: approx. 15.4 Hz) .

Adjustment Location:

– MAIN BOARD (Conductor Side) –

J102 J101

RV601

Tape Speed Adjustment

(Normal Speed)

RV603

Tape Speed Adjustment

(Double Speed)

– 8 –

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Sony TCM-21DV Section Electrical Adjustments, Tape Speed Adjustment, Test Tape, Record/Playback Head Azimuth Adjustment

TCM-21DV, TCM-20DV, TCM-22DV specifications

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