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7-4 Troubleshooting
7-4-1 Trobleshooting of the Power Supply Board
If any of the following occurs, the PCB is defective. Replace the PCB.
1. Pressing a selection button illuminates the LED display, but the buzzer does not sound.
2. Pressing a selection button sounds the buzzer, but does not illuminate the LED.
3. Pressing a selection button illuminates the wrong LED.
Insert the power plug into the receptacle and press the Power button. If the stored parameters do not display,
check the following :
7-4-2 Keyboard
When pressing a selection button, the buzzer does not sound, or the LED does not display.
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