Epson DLQ-3000 Service Manual page 154

Condition
T T
Symptom :An error has occurred.
"Fatal error" +35 VDC line
monitor circuit is
defective.
CR control circuit
is defective.
Sensors are not Sensor circuit is
functioning defective.
properly.
Rev. A
Table 5-12. Repair of C210 MAIN Board
Cause
Check the voltages output from pin
88 and pin 89 of IC16.
If the output voltages are correct,
CPU is defective.
Check pins 5, 6, 16 and 17 of IC7 for
input signal waveform and pins 1, 8,
11 and 18 for output signal
waveform.
If the motor phase signal is not
input, gate array IC25 is defective.
If the drive waveform is not output,
IC7 is defective.
Figure 5-13. CR Motor Drive Waveform
Check pin 85 of IC16 for the correct
reference voltage. (+5 V).
If it's normal, CPU is defective.
If it is abnormal, shunt-regulator
IC19 and its peripheral parts or the
electrical circuit is defective.
Check point
Troubleshooting
Solution
Replace the
main control
board or PSB/
PSE board.
Replace the
main control
board or IC7.
Replace the
main control
board or PSB/
PSE board.
5-15