TCS-600DV - Sony Audio Service Manual (repair manual). Page 7

7

7

1. Clean the following parts with a denatured-alcohol-moistened

swab:

record/playback/erase head

pinch roller

capstan

rubber belt

2. Demagnetize the record/playback/erase head with a head demag

netizer.

3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power supply

voltage (3 V) unless otherwise noted.

Mode

Torque Meter

Meter Reading

1.97 – 3.92mN•m

FWD

(20 – 40 g•cm)

CQ-102C

(0.28 – 0.55 oz•inch)

FWD
Back Tension

0.05 – 0.49 mN•m

REV

(0.5– 5 g•cm)

REV

(0.007 – 0.069 oz•inch)

Back Tension

FF, REW

CQ-201B

more than 4.91 mN•m

(more than 50 g•cm)

(more than 0.69 oz•inch)

Mode

Tension Meter

Meter Reading

FWD

CQ-403A

more than 50 g

(more than 1.76 oz)

Tape Speed Adjustment
Mode: playback

Procedure:
1. Set [DPC] switch (S401) off and [REC TIME] switch (S601) to
     NORMAL (4.8 cm/s) position, and playback the tape (WS-48A) .
2. Adjust RV601 so that frequency counter reading becomes 3,010
    Hz.
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 ad-
    just RV602 so that frequency counter reading becomes 1,505 Hz.

Confirm that deflection of the frequency counter reading between the
beginning and the end of tape is within 2% (NORMAL: approx. 60
Hz, DOUBLE: approx. 30 Hz) .

Setting:
• Supplied voltage:  3 V (DC)
• Switch and control position

VOL contorl (RV301)

: mechanical center

REC SPEED switch (S601) : normal (4.8cm/s)
PAUSE switch (S307)

: OFF

SPEED CONTROL (RV604) : center click
VOR switch (S501)

: OFF

0 dB=0.775 V

Type

Signal

 Used for

WS-48A

3 kHz, 0 dB

tape speed adjustment

16 Ω

input level

Mic

 –60dBs

output level

earphone

16k

Ω, –22.4dBs

IC605

10

11

RV601

RV602

Tape Speed Adjustment

Tape Speed Adjustment

(Normal Speed)

(Double Speed)

RV401

DPC Adjustment

1

20

DPC Adjustment
PRECAUTION: Perform this adjustment before tape speed adjust

            ment.

setting:
DPC switch (S401) : ON
Tape speed

: Noemal (4.8cm/s)

Mode

: Play

Q408

Q406

Q403

BCE

ECB

ECB

12

13

24

25

36

37

48

1

IC401

C431

C428

C427

C424

C438

C426

C425

C423

C422

C421

D406

D402

R402

R431

R420
R421

R423
R419

R410

R407

C408

C407

C416

C418

C429

433

C401

3

R406

R403

TP27

R409

R401

R408

R416

R422

R415

R414

R411

R

405

C411

C414

C430

C412

C413

V401

02

L401

+
–

TP27

frequency
counter

Procedure:
1. Connect the frequency counter to the test point TP27 on the MAIN

board.

2. Adjust RV401 so that frequency counter reading becomes 230 Hz.
    Standard value : 227 - 233Hz