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DFX-8500
Rev. B
5-2
0
Table 5-6. C204 MAIN/DRV/DRV-B boards Component Repair 5/7
Symptom Cause Checkpoint Solution
Paper feeding is
abnormal.
The CPU IC2) on the
C204 MAIN board is
defective.
Check the PF motor phase drive
signals at pins 2 - 5 of IC2.
Replace IC2.
IC2 on the C204 DRV
board is defective.
At IC2, check the output signals for
pins 2 (OUT_A), 3 (OUTXA), 6
(OUT_B), and 7 (OUTXB).
Replace IC2.
Ribbon feeding is
abnormal.
The CPU IC2) on the
C204 MAIN board is
defective.
Check the RF motor phase drive
signals at pins 6 - 9 of IC2.
Replace IC2.
The common
switching transistor on
the C204 DRV board
is defective.
Check the collector voltage of Q21. Replace Q20 or
Q21.
The phase switching
transistor on the C204
DRV board is
defective.
For transistors Q22 - Q25, observe the
input signal from the CPU (base) and
the output signal (collector).
if there is no output
signal, replace the
abnormal transistor.
Fuse F1 on the C204
DRV board is
defective.
Check if fuse F1 is defective. Replace F1.