SONY HCD-GX20
Service Manual

HCD-GX20

[GC Test Mode] � 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. [Version and Destination Display Mode] � 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. [CD Service Mode] � 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.
Note: � 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.

[MC Test Mode] � 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. [CD Ship Mode (No Memory Clear) ] � This mode moves the pickup 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 ?/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.

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