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TROUBLESHOOTING
Rev. B
5-1
5
Table 5-5. C204 PSB/PSE Board Component Repair 3/3
Symptom Cause Checkpoint Solution
The 5 VDC line is
defective.
IC204 is defective. Check the voltage level at pin 10 (V1)
and pin5 (GP).
Replace IC204.
Observe the drive waveform at pin 8
(VO) and pin 5 (GP).
Replace IC204 or
ZD211.
37 VDC line
(VP1/VP2) is
abnormal.
IC102 is defective. (If
this IC is defective, it
cannot monitor the 37
VDC lines, and
printing operation
becomes abnormal.),
When the input voltage of the minus
port (pin 6 for VP1 and pin2 for VP2) is
less than 1.3 VDC, the comparator
outputs a HIGH signal.
Replace IC203.
37 VDC line (VP3)
is abnormal.
IC203 is defective. (If
this IC is defective, it
cannot monitor the 37
VDC lines, and motor
operations become
abnormal.),
When the input voltage of the plus port
is bigger than 1.3 VDC, the comparator
outputs a HIGH signal.
Replace IC203.