Casio PX-130 Service Manual & Parts Manual page 35

Diagnostic program
1. Automatic Test
Automatic Test is performed each time the diagnostic program is launched.
1. RAM check and ROM check are performed.
If a test fails, the "SONG (u/n)" LED or the "L/R" LED illuminates.
2. LED check is performed.
The confirmation chords C4, E4, G4 sound, and the LEDs illuminate in the order indicated with the
blue arrow as shown in the illustration below.
The LEDs illuminate repeatedly until the "2. Model check" is performed.
2. Model check
1. Press the "FUNCTION" button to perform the "MODEL check".
The confirmation chords C4, E4, G4 sound.
If the model is PX-130, the "L" LED flashes.
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