HCD-RG121, MHC-RG121 - Sony Audio Service Manual (repair manual). Page 19

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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 ,

 PLAY MODE/TUNING MODE  and  DISC 3  simultaneously.

3. Press the  EQ+  button.

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

4. Press the  EQ–  button.

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

5. Press the  PRESET EQ  button.

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

6.  MASTER VOLUME  up and down.

“VOLUME MIN”, “VOLUME 16”, “VOLUME MAX” is
displayed.

7. Press  GROOVE  button.

The message “VACS OFF” on “VACS ON” is dislayed.

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

• This mode moves the pick-up 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.

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 three buttons  x  ,  CD  and  DISPLAY  simultaneously.
5. The “STANDBY” display blinks instantaneously and CD ship

mode is set.

6. The fluorescent indicator tube displays “COLD RESET” and

the set is reset.

Procedure:
1.

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

2.

Press two buttons of  x  and  Z  simultaneously for five seconds.

3.

The message “LOCKED” is displayed and the tray is locked.
(Even if exiting from this mode, the tray is still locked.)

4.

Press two buttons of  x  and  Z  simultaneously for five seconds
again.

5.

The message “UNLOCKED” is displayed and the tray is
unlocked.

6.

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

• 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 ,

 PLAY MODE/TUNING MODE  and  ENTER  simultaneously.

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

on.

4. Press  X  and  ENTER  buttons simultaneously, and the key

check mode is activated.

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

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

6. Press  X  and  ENTER  buttons simultaneously, and the key

count mode is activated.

7. The message “KEYCNT 0” is displayed.

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

8. Press  X  and  ENTER  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  X  and  ENTER  buttons simultaneously, and the volume

control detect mode is activated.

11. The message “VOLUME FLAT” is displayed.

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

12. To exit from the GC test mode after the head phone detect mode,

press  X  and  ENTER  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 ,

 PLAY MODE/TUNING MODE  and  DISC2  simultaneously.

3. The destination is displayed.
4. Press  DISPLAY  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 pick-up.

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 ,

 PLAY MODE/TUNING MODE  , and  Z  simultaneously.

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

M 

 button  to move the pick-

up to outside track, or press  

m 

 button to inside track.

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

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

 • Always move the pick-up 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.