HCD-GX20, MHC-GX20 - Sony Audio Service Manual (repair manual). Page 16

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• This mode is used to test the function of the equalizer.

Procedure:
1. Press  ?/1  button to turn the set ON.
2. To enter the test mode, press the three buttons  x ,  GAME EQ

and  DISC 3  simultaneously.

3. Press the  MOVIE EQ  button.

The function of the equalizer is set to “MIN”.

4. Press the  MUSIC EQ  button.

The function of the equalizer is set to “MAX”.

5. Press the  P.FILE  button.

The function of the equalizer is set to “FLAT”.

6. To exit from this mode, press  ?/1  button to turn the set OFF.

• This mode moves the pickup to the position durable to vibra-

tion. 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  ?/1  button to turn the set OFF.
4. Press  CD  button and  ?/1   button simultaneously.
5. The "STANDBY" display blinks instantaneously, and the CD

ship mode is set.

• All fluorecent segments and LEDs are tested.
• Keyboard check.

Procedure:
1. Press  ?/1  button to turn the set ON.
2. To enter the test mode, press the three buttons  x ,  GAME EQ

and  DISC 2  simultaneously.

3. All segments and LEDs (without STANDBY LED) are turned

on.

4. Press  GAME EQ  and  DISC 2  buttons simultaneously, and the

key check mode is activated.

5. The message “KEY 0 0 0 0” is displayed.

Each time a button is pressed, the key code number is displayed.

6. Press  GAME EQ  and  DISC 2  buttons simultaneously, and the

key count mode is activated.

7. The message “KEYCNT 0 1” is displayed.

Each time a button is pressed, “KEYCNT 0 1” value increased.
However, once a button is pressed, it is no longer taken into
account.

8. Press  GAME EQ  and  DISC 2  buttons simultaneously, and the

head phone detect mode is activated.

9. The message “H_P OFF” is displayed when a headphone jack

is not inserted.
“H_P ON ” is displayed when a headphone jack is inserted.

10. Press  GAME EQ  and  DISC 2  buttons simultaneously, and the

volume control detect mode is activated.

11. The message “VOLUME FLAT” is displayed.

“VOLUME UP” is displayed if rotating VOLUME knob
clockwise, or “VOLUME DOWN” is displayed if rotating
counterclockwise.

12. To exit from the GC test mode after the volume control detect

mode, press  GAME EQ  and  DISC 2  buttons simultaneously.

• The version or destination is displayed.

Procedure:
1. Press  ?/1  button to turn the set ON.
2. To enter the test mode, press the three buttons  x ,  GAME EQ

and  MOVIE EQ  simultaneously.

3. The destination is displayed.
4. Press  STOP  and  GROOVE  buttons simultaneously.
5. The version is displayed.
6. To exit from this mode, press  ?/1  button to turn the set OFF.

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

instance, when cleaning the pickup.

Procedure:
1. Press ?/1 button to turn the set ON.
2. Select the function “CD”.
3. To enter the test mode, press three buttons x ,  GAME EQ ,

and  OPEN/CLOSE  simultaneously.

4. The CD service mode is selected.
5. With the CD in stop status, press  

> 

 button  to move the pickup

to outside track, or press  

. 

 button to inside track.

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

1) Move the pickup to the most inside track.
2) Press  ?/1  button to turn the set OFF.

 • Always move the pickup to most inside track when exiting from

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

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

chipped.

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