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Nature of Trouble
No Power
No Sound at all
No music
No drum pad sound
No sound effect
Certain key or switch do not
function
LED on drum pad do not
light
TROUBLE SHOOTING
Faulty Block
Power supply circuit
Power switch
Power (DC in) jack
Power Amp.
CPU
Electronic Volume control
Oscillator
Sound Engine
CPU
DAC
Oscillator
I/O buffer
MIDI ROM
Piezzo sensor
Cable
I/O buffer
Sound Effect Chip
Key and switch matrix
I/O buffer
CPU
Drum pad LED
Cable
— 8 —
Cause/Remedy
Faulty 3IC2, 3IC4.Replace 3IC2, 3IC4
Faulty 3T4. Replace 3T4.
Faulty 3D1~3. Replace 3D1~3.
Poor contact. Clean the contacts.
Open or poor soldering. Replace the
jack or resolder.
Faulty 3IC1. Replace 3IC1
Faulty 1IC4. Replace 1IC4.
Faulty 1IC2. Replace 1IC2.
Faulty XTAL2. Replace XTAL2.
Faulty 1IC12. Replace 1IC12.
Faulty 1IC4. Replace 1IC4.
Faulty 1IC1. Replace 1IC1.
Faulty XTAL1. Replace XTAL1.
Faulty 1IC7, 1IC8. Replace 1IC7, 1IC8.
Faulty 1IC5. Replace 1IC5.
Faulty piezzo sensor. Replace piezzo
sensor.
Check cable.
Faulty 1IC9. Replace 1IC9.
Faulty 1IC11. Replace 1IC11.
Dust on the contact.
Faulty 1IC10. Replace 1IC10.
Faulty 1IC4. Replace 1IC4.
Faulty LED. Replace LED.
Check cables.
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