CMT-GS10, CMT-GS30DAB, HCD-GS10, HCD-GS30DAB - Sony Audio Service Manual (repair manual). Page 15

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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. The MC COLD RESET can be executed while the machine is

either in the standby status, or the power-on status.

2. Press three buttons of [DSGX],  x  , 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], x , 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, “1116V100”.

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

destination is displayed. For example, “GS10CE2”

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

x  , and [DSGX] simultaneously.

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. Insert a disc.
3. Press the  CD u  button to select CD function.
4. While pressing the  x  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  x  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. Insertt a disc.
3. Press the  CD u  button to select CD function, and press the

x  button.

4. Press the  @/1  button again to turn the power off (standby).
5. Press the [DISPLAY] button once. While pressing the  x  button,

press the  @/1  button.

6. 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. After pressing the [DISPLAY] button, while pressing the

TUNING+ML  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.

This mode can move the SLED of the optical pick-up, and also can
turn the optical pick-up laser power on and off.
Procedure:

1. Press the  @/1  button to turn the power on.
2. Press three buttons of  x  ,  

 + , and  [DISPLAY] simultaneously.

3. It enters the CD service mode and displays “SERVICE”.
4. To exit from this mode, press three buttons of  x ,  

 +  and

[DISPLAY] simultaneously.

TUNING+ML ,  TUNING–ml :

Use these keys to move the SLED. When
TUNING+ML  is pressed in this mode, the
SLED moves to outer circumference and the message
“SLED OUT” is displayed.
When  TUNING–ml  is pressed in this mode,
the SLED moves to inner circumference and the
message “SLED IN” is displayed.

PLAY MODE/TUNING MODE :

Use this key to turn the optical pick-up laser power
on and off. When the laser power is turned on, the
message “LD ON” is displayed. When the laser
power is turned off, the message “LD OFF” is
displayed.

The past errors of the optical pick-up system (= optical unit + BD
board) are displayed as the BD Errors as shown below.
Procedure:

1. Press the  @/1  button to turn the power on.
2. Insert a disc.
3. Press the  CD u  button to select CD function.
4. Press three buttons of  x , [DISPLAY] and  Z  simultaneously.
5. Then, the BD error code is displayed as “D0xxxxxx” (x means

hexadecimal number) on the LCD screen.

6. Every pressing of the  TUNING+ML  button in this mode

increments the number after “D” starting from “D0” up to
“D4”, and then returns to “D0”. Every pressing of the
TUNING–ml  button in this mode decrements the
number after “D”. The smaller the error code number is, the
newer the error content is.

7. To exit from this mode, press the  @/1    button to turn the

power off.