Casio PX-720 Service Manual & Parts Manual page 22

5. MODEL check
 Press the "SOFT" pedal.
The confirmation chord E4 sounds and "MODERN" LED lights.
 Press the "SOSTENUTO" pedal.
The confirmation chord G4 sounds and "MODERN" LED lights.
 Press the "DAMPER" pedal. (ON HALF)
The confirmation chord C4 sounds and "CLASSIC" LED lights.
 Press the "DAMPER" peda. (ON FULL).
The confirmation chord C4 sounds and "CLASSIC" LED lights.
6. Headphone check
 Press "TONE/SETTING" button to perform the "Headphone check."
The confirmation chords C4, E4, G4 sounds and "L" LED lights.
 Connect the headphone to the jack.
"R" LED lights.
 Press the "A4" key.
 Remove the headphone from the jack.
"L" LED lights.
 There are 2 headphone jacks. Repeat Steps  →  →  for each jack.
 Press "TONE/SETTING" button to finish the "headphone check."
The confirmation chords C4, E4, G4 sound and the light on "L" LED turns off.
7. MIDI check (If there is no MIDI cable, this check can be skipped.)
 Connect the MIDI cable.
 Press the "A4" key.
The confirmation chords C4, E4, G4 sounds.
 Remove the MIDI cable.
 Press "TONE/SETTING" button.
The confirmation chords C4, E4, G4 sounds.
 Press "TONE/SETTING" button.
The confirmation chords C4, E4, G4 sound twice.
8. FLASH MEMORY check
 Hold down "RECORDER" button to perform the "FLASH Memory Check".
"RECORDER" LED flashes
Then the light on "RECORDER" LED turns off and the confirmation chords C4, E4, G4 sound.
The diagnostic program ends.
Turn off the power to complete the checking.
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