DOWNLOAD Sony CHC-TB10 / CHC-TB20 / HCD-TB20 Service Manual ↓ Size: 12.26 MB | Pages: 70 in PDF or view online for FREE

21

4

two screws (+BTTP M2.6)

2

connector (CN702)

7

motor assy (M721)

5

MOTOR board

6

1

belt

3

Remove two solders.

MOTOR board bottom view

22

• This mode moves the optical pick-up to the position durable to

vibration. Use this mode when returning the set to the customer
after repair.

Procedure:
1. Press ?/1 button to turn the set on.
2. Select the function “CD”.
3. Press  CD 1  button and FUNCTION button simultaneously.
4. After the “STANDBY” display blinks six times, a message

“LOCK” is displayed on the liquid crystal display, and the CD
ship mode is set.

• This mode is used to check the software version, LCD, LED

and keyboard.

Procedure:
1. Press  ?/1  button to turn the set on.
2. Press three buttons x ,  ENTER , and  CD 2  simultaneously.
3. LEDs and segments of liquid crystal display are all turned on.
4. When you want to enter the software version display mode,

press  CD 1 .  The model number and destination are displayed.

5. Each time  CD 1  is pressed, the display changes starting from

MC version, GC version, CD version, CDD version, CDMA
version, CDMB version, BDA version, BDB version, ST version,
TA version, TM version, TC version and MD version in this
order. By pressing  CD3  the date of the software version is
displayed.

6. Press  CD 2  button, and the key check mode is activated.
7. In the key check mode, the liquid crystal display displays “K 

0

J 0  V 0”.  Each time a button is pressed, “K 0” value increases.
However, once a button is pressed, it is no longer taken into
account.
“V  0” value increases like 1, 2, 3 ... if rotating  VOL  knob in
“+”  direction, or it decreases like 0, 9, 8 ... if rotating in
“–” direction.

8. To exit from this mode, press three buttons in the same manner

as step 2, or disconnect the power cord.

• This mode is used to check operations of the respective sections

of Amplifier, Tuner, CD and Tape.

Procedure:
1.

Press the  ?/1  button to turn on the set.

2.

Press the three buttons of  x  ,  ENTER  and  CD 3
simultaneously.

3.

“MD” is displayed.

4.

Every pressing of  EQ EDIT  changes the displays in the order
of

5.

When the VOL control knob is turned clockwise even slightly,
the sound volume increases to its maximum and a message
“VOL MAX” appears for two seconds, then the display returns
to the original display.

6.

When the VOL control knob is turned counter-clockwise even
slightly, the sound volume decreases to its minimum and a
message “VOL MIN” appears for two seconds, then the display
returns to the original display.

7.

Press the  FUNCTION  button to the TUNER.

8.

By pressing the  TUNING MODE  button, select the preset
tuning.

9.

The default-preset channel is selected. (It means that the
memory is cleared.)

10. When a tape is inserted in Deck and recording is started, the

input source function selects MD automatically.

11. During the recording by tuning  m/M    knob, the Tape

(Deck) is selected and tape is rewound. Tape stops at around
the record-starting position and playback of the recorded portion
of the tape is started.

12. Press  ?/1  button to turn the set off. The cold reset is enforced

at the same time.

• This mode can run the CD sled motor freely. Use this mode, for

instance, when cleaning the optical pick-up.

Procedure:
1. Press ?/1 button to turn the set on.
2. Select the function “CD”.
3. Press three buttons  x  ,  FUNCTIO  , and  CD 2  simultaneously.
4. The CD service mode is selected.
5. With the CD in stop status, turn the  m/M  knob up to move

the optical pick-up to outside track, or turn the  m/M   knob
counter-up to inside track.

6. To exit from this mode, perform as follows:

1) Move the optical pick-up to the most inside track.
2) Press  ?/1  button to turn the set off.

 • Always move the optical pick-up to most inside track when exit-

ing from this mode.  Otherwise, a disc will not be unloaded.

• Do not run the sled motor excessively, otherwise the gear can be

chipped.

• Set the CD ship mode and set the default setup when shipped

from the factory at the next AC power on.

Procedure:
1. Press  ?/1  button to turn the set on.
2. Select the function  “CD ”.
3. Press three buttons  x  ,  FUNCTION  and  CD 1  simultaneously.
4. After the “STANDBY” display blinks six times, a message

“LOCK” is displayed on the liquid crystal display, and the CD
ship mode is set.

• 5 times limit of repeating CD is released.

Procedure:
1.

Press  ?/1  button to turn the set on.

2.

Press three buttons  x ,  FUNCTION  and  CD 1Z .

3.

The massage “LIMIT OFF” is displayed. 5 times limit of
repeating CD is released.

4.

Cold reset is performed at power off.

“GEQ MIN”t“GEQ FLAT”t“GEQ MAX”  

23

3.04 – 6.96 mN • m

(31 to 71 g • cm)

(0.43 – 0.98 oz • inch)

0.20 – 0.58 mN • m

(2 to 6 g • cm)

(0.02 – 0.08 oz • inch)

3.04 – 6.96 mN • m

(31 to 71 g • cm)

(0.43 – 0.98 oz • inch)

0.20 – 0.58 mN • m

(2 to 6 g • cm)

(0.02 – 0.08 oz • inch)

6.97 – 14.02 mN • m

(71 to 143 g • cm)

(0.98 – 1.99 oz • inch)

0.98 N • m or more

(100 g or more)

(3.53 oz or more)

0.98 N • m or more

(100 g or more)

(3.53 oz or more)

CQ-102C

CQ-102C

CQ-102RC

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

1.

Clean the following parts with a denatured alcohol-moistened
swab:

record/playback heads

pinch rollers

erase head

rubber belts

capstan

idlers

2.

Demagnetize the record/playback head with a head demag-
netizer.

3.

Do not use a magnetized screwdriver for the adjustments.

4.

After the adjustments, apply suitable locking compound to the
parts adjusted.

5.

The adjustments should be performed with the rated power
supply voltage unless otherwise noted.

Procedure:
1.

Mode : Playback

FWD

FWD
back tension

REV

REV
back tension

FF/REW

FWD tension

REV tension

1.

Demagnetize the record/playback head with a head demagnetizer.

2.

Do not use a magnetized screwdriver for the adjustments.

3.

After the adjustments, apply suitable locking compound to the
parts adjusted.

4.

The adjustments should be performed with the rated power
supply voltage unless otherwise noted.

5.

The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)

6.

The adjustments should be performed for both L-CH and R-
CH.

7.

Switches and controls should be set as follows unless otherwise
specified.

2.

Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1 dB of peak.

test tape
P-4-A100
(10kHz, –10dB)

MAIN board
CN322
Pin 

5

 or TP42 (L-CH)

Pin 

9

 or TP46 (R-CH)

level meter

set

+

–

L-CH
peak

R-CH
peak

screw
position

output
level

within
1 dB

L-CH
peak

R-CH
peak

screw
position

within 1dB

P-4-A100

WS-48B

10 kHz, –10 dB

3 kHz, 0 dB

Azimuth Adjustment

Tape Speed Adjustment

24

4.

After the adjustments, apply suitable locking compound to the
parts adjusted.

Adjustment Location: Record/Playback/Erase Head

Note: Set the test mode using the following method and begin tape

speed adjustment.

Procedure:
With the power turned on, press the  x  button,  ENTER  button,
and  CD 3  button simultaneously.
(The message “MD” is displayed while in the test mode.)
To exit the test mode, press the  "/1  button.

1.

Insert the WS-48B into deck.

2.

Press the  Y  button of deck.

3.

Check the reading of frequency counter becomes 3000 ± 90 Hz.

W.RMS (JIS) less than 0.3%
(test tape: WS-48B)

3.

Mode: Playback

test tape
P-4-A100
(10kHz, –10dB)

oscilloscope

set

Waveform of oscilloscope

in phase

45

°

90

°

135

°

180

°

good

wrong

Pin 

6

 (GND)

MAIN board
CN322
Pin 

5

 or TP42 (L-CH)

Pin 

9

 or TP46 (R-CH)

L

R

INTRODUCTION
When set to the test mode performed in 

,

when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This “REC memory mode” is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to MD.
(After recording, turn the  m/M  knob without stopping will
return to the position where recording was started.)

1.

Press  FUNCTION  button to select MD. (This step is not
necessary if the above test mode has already been set.)

2.

Insert a tape into deck, press the  REC PAUSE/START  button,
and then press the  Y button to start recording.

3.

Mode: Record

5.

Confirm playback the signal recorded in step 2 become
adjustment level as follows.
If these levels do not adjustment level, adjust the RV653 (L-CH)
and RV603 (R-CH) on the TC board to repeat steps 3 and 4.

Adjustment level: The playback output of 10 kHz level difference

against 315 Hz reference should be 0 ± 0.5 dB.

4.

Mode: Playback

recorded
position

level meter

set

MAIN board
CN322
Pin 

5

 or TP42 (L-CH)

Pin 

9

 or TP46 (R-ch)

AF OSC

MD IN
1) 315 Hz
2) 10 kHz

blank tape
CS-123

set

attenuator

600 

Ω

} 50 mV (–23.8 dB)

RV652

(L-CH)

RV602
(R-CH)

RV653

(L-CH)

RV603
(R-CH)

Record Level

Record Bias

CN322

TP42

TP46

1

11