Epson ColorPage EPL-C8000 Service Manual page 411

EPSON EPL-C8000
FIP-2.12 FRONT OHP SENSOR is Defective
Step Check point
Perform the preliminary inspection.
Parts to check:
1
FRONT OHP SENSOR, REGI. HARNESS ASSY, P/H
HARNESS ASSY, MCU PWB
Check: Power supply to the FRONT OHP SENSOR
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2 Is the voltage level correct at the pins below?
- P20-6PIN<=>P20-4PIN: 5VDC
Check:
Power supply to the FRONT OHP detection signal
3
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Is the voltage level correct at the pins below?
- P20-5PIN<=>P20-4PIN: 5VDC
Check: FRONT OHP detection signal
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Is the voltage level correct depending on the conditions
below?
- Pins: P/J20-5PIN<=>P/J20-4PIN
4
- Photo reflecting status (paper is set): 0VDC
- Photo unreflecting status (no paper is set): 5VDC
NOTE: When setting the conditions, reflecting and
unreflecting, use white paper, not OHP sheet. Use of OHP
sheet causes failure in judgement since it is transparent.
Check: REGI. HARNESS ASSY electrical continuity
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Does the REGI. HARNESS ASSY have proper
5
continuity at the pins below?
- J98<=>J91
Check: P/H HARNESS ASSY
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Does the P/H HARNESS ASSY have proper continuity
6
at the pins below?
- P91<=>J20
Chapter 5 TROUBLESHOOTING
Remedy
Yes
Replace/reinstall the defective part(s).
Go to Step 3.
Go to Step 4.
Replace the MCU PWB.
Go to Step 6.
Replace the FRONT OHP SENSOR.
No
Go to Step 2.
Go to FIP-2.1 "LVPS 5VDC is
Defective".
Replace the MCU PWB.
Go to Step 5.
Replace the REGI. HARNESS ASSY.
Replace the P/H HARNESS ASSY.
Rev. B
5-77