Casio CT-640 - Troubleshooting; Common Problems and Solutions

*For any malfunction, always check battery condition first. (see di 5)
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_ No.sound,. even. i{ keys are
pressed.
1. Main volume turned down.
2. Headphones connected.
3. Auto power off has activated.
Chord/MIDI. selector is set to MIDI
position.
~ Tone bank inoperative
~“ Auto harmonize inoperative
~ Registration select button
‘+ inoperative
Record button-inoperative.....
Rhythm volume turned down.
No accompaniment,
7 turned down.
a aa interference.
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Refrigerators, washing machines and
similar electric appliances.
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1. Main volume turned down.
2. Defective connection cord.
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No sound when connected —
to ‘external amplifier.
20
Main and accompaniment volume
'Reniedy
1, Turn up main volume.
2. Disconnect headphones.
3. Turn the power switch off and then
on again.
Change setting of Chord/MIDI selector.
Turn up rhythm volume.
Turn up main and accompaniment
volume.
Use outlet as far away as possible from
appliance thought to be the cause.
1. Turn up main volume.
2. Replace connection cord.