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SECTION 4 TEST MODE
VIDEO CD COLOR-BARS MODE
On this mode, the data of the color-bars signal as a picture signal and the 1kHz sine wave signal as a sound signal are output by the mechanism control microcomputer (IC701) for video CD signal check. When measurement of the voltage and waveform on the VIDEO board, perform it in this mode. For refernce, the color-bars signal can be observed at J9001 (VIDEO OUT) and the sound signal can be observed at J101 (VIDEO (AUDIO) OUT) using an oscilloscope. 1. Connect the lead wire to both ends of the land of SL701 (CAL BAR) of the VIDEO board. 2. Turn the power on. Press FUNCTION button to select CD. 3. After 2 or 3 seconds later, connect the lead wire. 4. After measuring, remove the lead wire connected. NOTE: The 1 kHz sine wave is not outputted when the CD is played once, but it is not error. [VIDEO BOARD] (SIDE B)
SL703 (AFADJ) SL702 (ADJ) IC751 IC251 SL701 (CAL BAR)
E-F BALANCE MODE
� Refer to SECTION 6 ELECTRICAL ADJUSTMENTS page 15. 1. Connect the lead wire to both ends of the land of SL702 (ADJ) and SL703 (AFADJ) of the VIDEO board. 2. Turn the power on. Press FUNCTION button to select CD. 3. Short-circuit the lead wire. (At this time, �DISC� on the fluorescent indicator tube will blink (test mode). If it is not blinking, perform from step 1 again.) 4. Press the · button in playback. 5. Every pressing the REPEAT button, the tracking servo and the sledding servo are turned on or off. 6. When the servo is OFF, the counter on front panel will not be changed. 7. After measuring, remove the lead wire connected step 1.
� 11 �
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