SONY HCD-GX450
Service Manual

HCD-GX450

[PANEL 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 , 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. [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 , PLAY MODE/TUNING MODE and DISC 2 simultaneously. 3. The destination is displayed. 4. Press DISPLAY buttons simultaneously. 5. The version is displayed. 6. To exit from this mode, press the three buttons x , PLAY MODE/TUNING MODE and DISC 2 simultaneously and 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 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.
Note: � 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.

[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 , PLAY MODE/TUNING MODE and DISC 3 simultaneously. 3. Press the EQ + button. The function of the equalizer is set to �MAX�. 4. Press the EQ - button. The function of the equalizer is set to �MIN�. 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 the GROOVE button. The message �VACS OFF� or �VACS ON� is displayed. 8. To exit from this mode, press ?/1 button to turn the set OFF. [CD Ship Mode (LOCK) ] � This mode moves the pick-up 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, the message �LOCK� is displayed and the CD ship mode is set. [CD Ship (LOCK) & COLD RESET MODE] 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. To fluorescent indicator tube displays �COLD RESET� and the set is reset. [Disc Tray Lock] Procedure: 1. Press the ?/1 button to turn the set ON. 2. Select the function �CD�. 3. Press two buttons of x and Z simultaneously for five seconds. 4. The message �LOCKED� is displayed and the tray is locked. (Even if exiting from this mode, the tray is still locked.) 5. Press two buttons of x and Z simultaneously for five seconds again. 6. The message �UNLOCKED� is displayed and the tray is unlocked. 7. To exit from this mode, press the ?/1 button to turn the set OFF.

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