DOWNLOAD Sony CMT-GB3 / HCD-GB3 Service Manual ↓ Size: 5.27 MB | Pages: 60 in PDF or view online for FREE

13

3

cover 

4

belt (DLM3A)

5

belt (DLM3A)

2

two screws

(+BVTP2.6 

× 

8)

1

two screws

(+BVTP2.6 

× 

8)

2

six screws

(+BV3 

× 

10)

4

two screws

(+BV3 

× 

10)

3

back panel

1

connecter

     (CNP902)

5

DC fan

7

four screws

(+BVTP4 

× 

12)

6

Remove soldering from 

     the two points.

qa

chassis (main mold)

9

AC HOLD board

0

power cord

8

screw

(+BV3 

× 

10)

14

4

four screws

7

two transister screws

1

screw

(+BV3 

× 

10)

8

screw

(+BV3 

× 

10)

2

three screws

(+BV3 

× 

10)

6

POWER board 

3

plate (pt shield)

9

AMP board

5

15

The cold reset clears all data including preset data stored in the
memory to initial conditions. Execute this mode when returning
the set to the customer.
Procedure:

1. In the standby status, press the  @/1  button to turn the power

on.

2. Press three buttons of [DSGX],  s , and at last   @/1  simulta-

neously.

3. When “RESET” appears, the machine enters standby status.

1. In the standby status, press the  @/1  button to turn the power

on.

2. Press three buttons of [DISPLAY], s , and [DSGX] simulta-

neously.

3. When the panel test mode is activated, LEDs and segments of

LCD are all turned on.

1. In the panel test mode (all LEDs and segments of LCD are

turned on), press the [AUDIO IN] button.

2. On the LCD, date and version are displayed “xxxxxxxx”.

For example, “1227V002”.

3. From this status, press the [TUNER/BAND]  button, and the

destination is displayed. For example, “GB3LATIN”

4. To release from this mode, press three buttons of [DISPLAY],

s , and [DSGX] simultaneously.

Number of repeats for CD playback is 5 times when the repeat mode
is “REPEAT”. This mode enables CD to repeat playback for limitless
times.
Procedure:

1. Press the  @/1  button to turn the power on.
2. Press the  CD 7  button to select CD function.
3. Press three buttons of  CD 7 , [EQ], and [DISC SKIP] simul-

taneously.

4. It enters the CD repeat 5 limit cancel mode and displays “NO

LIMIT”

5. To release this mode, press the  @/1  button to turn the power

off.

This mode can run the CD sled motor optionally. Use this mode, for
instance, when cleaning the optical pick-up.
Procedure:

1. Press the  @/1  button to turn the power on.
2. Press the  CD 7  button to select CD function.
3. Press two buttons of  CD 7  and  @/1  simultaneously. *1
4. Set to the CD ship mode. (chucking on)
5. After blink “STANDBY”, “LOCK” is displayed, disconnect

the AC plug.
*1) If press three buttons of [DISC 3],  s  and  @/1  simulta-

neously, activate the CD ship mode and MC cold reset.

This mode is for the antitheft of CD disc in shop. (not for transport)
Procedure:

1. Press the  @/1  button to turn the power on.
2. Press the  CD 7  button to select CD function.
3. Insert a disc.
4. While pressing the  s  button, press the  Z  button for more 5

seconds.

5. The message “LOCKED” is displayed and the disc slot is

locked. (Even if exiting from this mode, the disc slot is still
locked)

6. If press the  Z  button to eject the disc, the message

“LOCKED” is displayed and can not eject the disc.

7. To release this lock, while pressing the  s  button, press the

 Z  button for 5 seconds again.

8. The message “UNLOCKED” is displayed and the disc slot is

unlocked.

This mode is for switch the CD power supply on/off. Even if this
state pulls out AC plug, it is held.
Procedure:

1. Press the  @/1  button to turn the power on.
2. Press the  CD 7  button to select CD function.
3. Press the  @/1  button again to turn the power off (standby).
4. While pressing the  s  button, press the  @/1  button.
5. It turns power on and display “CD POWER”, then display

“ON” or “OFF”.

The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:

1. Press the  @/1  button to turn the power on.
2. Press the [TUNER/BAND]  button to select TUNER (AM)

function.

3. Press the  @/1  button again to turn the power off (standby).
4. While pressing the   TUNING+ JL  button, press the

 @/1  button.

5. It turns power on and display “9k STEP” or “10k STEP”, and

thus the tuning interval is changed over.

16

1. Mode:  Playback

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 1dB of peak.

3. Mode:  Playback

4. After the adjustments, apply suitable locking compound to

the pats adjusted.

Screw
position

L-CH
peak

within
1dB

Output
level

L-CH
peak

R-CH
peak

within
1dB

Screw
position 

R-CH
peak

0 dB=0.775 V

set

JACK board
PHONES  jack
(J102)

+
–

level meter 

test tape
P-4-A063
(6.3 kHz, 

−

10 dB)

1. Demagnetize the record/playback head with a head

demagnetizer.

2. Do not use a magnetized screwdriver for the adjustments.

•

P-4-A063

6.3 kHz, –10 dB

Azimuth Adjustment

set

test tape
P-4-A063
(6.3 kHz, 

−

10 dB)

oscilloscope

V

H

waveform of oscilloscope

in phase 45

°

90

°

135

°

180

°

good

wrong

JACK board
PHONES  jack
(J102)

•

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

swab :

record/playback head

pinch roller

erase head

rubber belts

capstan

idlers

2. Demagnetize the record/playback head with a head

demagnetizer. (Do not bring the head magnetizer close to the
erase head.)

3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, appiy suitable locking compound to

the parts adjusted.

5. The adjustments should be performed with the rated power

supply voltage unless otherwise noted.

•

•

FWD

CQ-403A

more than 80 g

(more than 2.82 oz)

2.0 – 8.0 mN • m

(20 to 80 g • cm)

(0.28 – 1.12 oz • inch)

0.15 – 0.6 mN • m

(1.5 to 6 g • cm)

(0.021 – 0.083 oz • inch)

5 – 17.7 mN • m

(50 to 177 g • cm)

(0.7 – 2.48 oz • inch)

5 – 17.7 mN • m

(50 to 177 g • cm)

(0.7 – 2.48 oz • inch)

CQ-102AS

CQ-102C

CQ-201AS

CQ-201B

FWD

FWD

back tension

FF

REW