Technics SX-PX552, Руководство по обслуживанию

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No. PCB TEST MODE Procedure
3 MAIN Wave ROM check
MAIN: IC12
1. Press and hold the two E keys shown below, and then
the power switch.
2. Select the POP GRAND sound.
3. Reduce the MAIN VOLUME level low enough.
When set to the self-diagnostic mode, the Wave ROM outputs a sine wave. The Wave
correspond to the keyboard keys as shown in the diagram to the right. When a key
pressed, the corresponding sine wave sound is produced. If no sound is produced,
sound is distorted, the Wave ROM corresponding to that key is defective. This methode
allows to diagnose also the output routes (L/R) from the Wave ROM.
4 CPL /
CPR
Control Panel buttons
LED ligting check Press and hold the two F keys shown below, and then turn
power switch.
Press the buttons on the control panel and confirm that the corresponding LEDs light.
5 Control Panel LED
display check Press and hold the two G keys shown below, and then turn
power switch.
The numbers are displayed automatically and repieatedly on the display.
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