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DFX-8500
Rev. B
5-1
8
Table 5-6. C204 MAIN/DRV/DRV-B boards Component Repair 3/7
Symptom Cause Checkpoint Solution
The carriage
operates
abnormally.
IC1 on the C204
MAIN board is
defective.
Check the signals for the carriage
motor phases at pins 204 (CRA), 205
(CRB), 206 (CRC), and 5 (CRD) of IC1
Replace IC1.
Q16, Q17, Q18, or
Q19 on the C204
MAIN board is
defective.
Check the signals for the carriage
motor phases at collectors Q16 (CRA),
Q17 (CRB), Q18 (CRC), and Q19
(CRD).
Replace Q16, Q17,
Q18, or Q19.
IC1 is doesn’t work. Check the voltage level between Anode
and Kathode of ZD2 is APPROX. 6.2 V.
Replace ZD2, Q34,
or Q35.
IC1 on the C204 DRV
board is defective.
Check the signals for the carriage
motor phases at pins 14 (IN_A) and 10
(OUT1) of IC1..
Replace IC1.
. Measure the voltage level at pins 10
(OUT1) and 5 (GP) of IC1 when the
carriage is operating. (The normal
voltage level is approximately 37
VDC.),
Replace IC1.
IC3 on the C204 DRV
board is defective.
Observe the waveform at pin 1 of IC3. Replace IC3.