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Troubleshooting Chart
The charts below were created in an effort to relieve the beleaguered technician
from having to "discover" some of the common faults we have seen. Please note that we
only cover the most likely causes, not all of them.
C4 Symptom
No Lights, No Sound. (Dead).
No wet (effects) signal.
Distortion.
Programs not changing.
Intermittent operation.
C4 Service Manual
Possible Cause
Faulty AC adapter.
Defective component in power supply circuit.
Loose front panel cable.
Faulty ASIC
Faulty DRAM
Faulty Crystal
Faulty DAC
Faulty ADC
Faulty Power Supply Rail
Faulty op-amp
Faulty DAC
Faulty ADC
Faulty shaft encoder.
Faulty Crystal.
Faulty potentiometer(s)
Poor through hole Solder
10-22-02
Solution
Replace and retest.
Troubleshoot and repair as necessary.
Troubleshoot and repair as necessary.
Replace and retest.
Replace and retest.
Replace and retest.
Troubleshoot and repair as necessary.
Troubleshoot and repair as necessary.
Troubleshoot and repair as necessary.
Troubleshoot and repair as necessary.
Troubleshoot and repair as necessary.
Troubleshoot and repair as necessary.
Replace and retest.
Replace and retest.
Replace and retest.
Check all through hole solder connections,
particularly near the power supply area.
V1.01
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