Diagnostic Program - Casio PX-300 Service Manual

Initial Setup
1. Connect an AC adaptor.
2. Connect a Sustain pedal.
3. "Main" volume: MAX.
NOTE: If there is no pedal or MIDI cable, pedal or MIDI check can be skipped.
How to start diagnostic program
1. Press the "POWER" button while pressing the "REVERB/CHORUS KEY" buttons.
2. Release the "POWER" button first while still pressing the "REVERB/CHORUS KEY" buttons.
All the LEDs light and the test mode boots.

Diagnostic program

1. Automatic Test
1 RAM CHECK
* When an error is found in RAM, "TONE1" LED lights.
2 ROM CHECK
* When an error is found in ROM, "TONE2" LED lights.
3 LED CHECK
Groups of LEDs as shown below light by turns repeatedly.
4 Press "CONTROL" button.
*The confirmation chord of C4, E4 and G4 sounds.
GROUP1
2. BUTTON check
1 Press "CONTROL" button.
*The confirmation tone of C6 sounds.
2 Press the buttons in the following order.
*NG tone sounds when an error is found in the buttons or when the buttons are pressed in a wrong order.
* This check cannot be aborted.
3. Pedal check (If there is no Pedal, this check can be skipped)
1 Press "CONTROL" button.
*The confirmation chord of C4, E4 and G4 sounds.
2 Press the "DAMPER" pedal.
* The confirmation tone of C4 sounds and "RIGHT/TRACK2" LED lights.
3 Press the "SOFT" pedal.
* The confirmation tone of C4 sounds and "RIGHT/TRACK1" LED lights.
DIAGNOSTIC PROGRAM
GROUP3
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GROUP2