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TROUBLE SHOOTING
Nature of Trouble Faulty Block Cause/Remedy
No Power Power supply circuit Faulty 3IC2, 3IC4.Replace 3IC2, 3IC4
Faulty 3T4. Replace 3T4.
Faulty 3D1~3. Replace 3D1~3.
Power switch Poor contact. Clean the contacts.
Power (DC in) jack Open or poor soldering. Replace the
jack or resolder.
No Sound at all Power Amp. Faulty 3IC1. Replace 3IC1
CPU Faulty 1IC4. Replace 1IC4.
Electronic Volume control Faulty 1IC2. Replace 1IC2.
Oscillator Faulty XTAL2. Replace XTAL2.
No music Sound Engine Faulty 1IC12. Replace 1IC12.
CPU Faulty 1IC4. Replace 1IC4.
DAC Faulty 1IC1. Replace 1IC1.
Oscillator Faulty XTAL1. Replace XTAL1.
I/O buffer Faulty 1IC7, 1IC8. Replace 1IC7, 1IC8.
MIDI ROM Faulty 1IC5. Replace 1IC5.
No drum pad sound Piezzo sensor Faulty piezzo sensor. Replace piezzo
sensor.
Cable Check cable.
I/O buffer Faulty 1IC9. Replace 1IC9.
No sound effect Sound Effect Chip Faulty 1IC11. Replace 1IC11.
Certain key or switch do not Key and switch matrix Dust on the contact.
function
I/O buffer Faulty 1IC10. Replace 1IC10.
CPU Faulty 1IC4. Replace 1IC4.
LED on drum pad do not Drum pad LED Faulty LED. Replace LED.
light
Cable Check cables.
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