Common Solutions - Alesis D4 Service Manual

7.00 Common Solutions

The following table presents solutions to the most common problems that we have seen. Please
be aware that this does mean that every possible scenario is covered here. There is always the
possibility that other "odd" failures may lead to the same symptom. This table should help about 90% of
the time.
NOTE: Due to the fact that the D5 has not been in the field long enough to establish a separate service
history, a separate troubleshooting table will have to wait for future revisions of this manual. While the
following applies specifically to the D4, it is likely that similar symptoms will lead to similar solutions in
the D5.
Described Defect
Unit Dead.
Unit locked up.
Only boxes in display.
Intermittent reset.
No battery backup.
Trigger failure.
Audio Distortion.
No MIDI In.
No MIDI Out.
Data wheel not working correctly.
No button function/LEDs after repair.
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Alesis D4/D5 Drum Modules Service Manual
Probable Cause
Faulty power switch.
Faulty D1.
Faulty A.C. Adapter.
C26 shorted.
Faulty 7805 regulator.
Faulty D1 or D2.
Faulty 8031.
Faulty SRAM.
C32 leaking. (reset cap).
Faulty D1 or D2.
Faulty LCD.
Faulty LCD Cable.
Faulty D1.-This can be determined by
checking the voltage at the cathode. If the
peak voltage is less than 9V then the diode
is defective.
C32 (reset cap).
Q3 or Q4 shorted.
C33 shorted.
Faulty SRAM.
Dead Battery.
Poor solder or missing component on D6.
Crashed-(check MIDI and external trigger
setups for missing pages).
Faulty or wrong Q6-9.
Faulty U21.
Faulty 8031.
Poor connection/bad cable at J5.
Faulty D2.
Faulty DAC.
Faulty ASIC.
Faulty PUP circuit.
Faulty opto-isolator.
Faulty 8031.
Faulty U7.
Faulty 8031.
Faulty shaft encoder.
Cable at J3 faulty or loose.
J2 or J1 header backwards (up to rev Bs).
11
Solution
Replace and retest.
Replace and retest.
Replace and retest.
Replace and retest.
Replace and retest.
Replace and retest.
Replace and retest.
Replace and retest.
Replace and retest.
Replace and retest.
Replace and retest.
Replace and retest.
Troubleshoot and repair as necessary.
Replace and retest.
Troubleshoot and repair as necessary.
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.
Replace and retest.
Replace and retest.
Troubleshoot and repair as necessary.
Replace and retest.
Replace and retest.
Replace and retest.
Troubleshoot and repair as necessary.
Replace and retest.
Replace and retest.
Replace and retest.
Replace and retest.
Replace and retest.
Troubleshoot and repair as necessary.
Key towards front
02/19/03