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DFX-8500
Symptom
The carriage
operates
abnormally.
Table 5-6. C204 MAfN/DRV/DRV-S boards Component Repair 3/7
cause Checkpoint
Solution
IC1 on the C204 Check the signals for the carriage
Replace ICI.
MAIN board is
motor phases at pins 204 (CRA), 205
defective.
(CRS), 206 (CRC), and 5 (CRD) of ICI
Q16,Q17,Q18, or Check the signals for the carriage
Replace Q16, Q17,
019 on the C204
motor phases at collectors Q16 (CRA).
Q18, or Q19.
MAIN board is
Q17 (CR@, Q16 (CRC), and Q19
defective.
(CRD).
ICl is doesn’t work. Check the voltage level between Anode
Replace ZD2, Q34,
and KatWe of 202 is APPROX. 6.2 V.
or Q35.
ICl on the C204 DRV
Check the signals for the carriage
Replace ICI.
board is defective.
motor phases at Dins 14 (IN-A) and 10
Measure the voltage level at pins 10
(OUTl) and 5 (GP) of ICI when the
voltage level is aooroximatelv 37
1 VDC:,, ” -
IC3 on the C204 DRV
Observe the waveform at pin 1 of IC3.
Replace IC3.
board is defective.
S-18
Rev. A