Epson AcuLaser C8500 Service Manual page 444

EPSON AcuLaser C8500
FIP-2.12 Faulty REGI. SENSOR FIP-2.12 Faulty REGI. SENSOR FIP-2.12 Faulty REGI. SENSOR FIP-2.12 Faulty REGI. SENSOR
Step
*Initial setting
Use of parts of non-EPSON specifications, improper mounting, damage, distortion, dirt,
adherence of foreign matter?
1
*Main parts to check
REGI. SENSOR, REGI. HARNESS ASSY
P/H HARNESS ASSY, MCU PWB
*REGI. SENSOR power supply check
2
Is the voltage between P020B-20PIN <=> P20-18PIN 5VDC?
*REGI. detection signal power supply check
3
Is the voltage between P20-19PIN <=> P20-18PIN 5VDC?
*REGI. detection signal check
Is the voltage between P/J20-19PIN <=> P/J20-18PIN as follows?
4
When
reflecting
When
not reflecting
*REGI. HARNESS ASSY continuity check
5
Is there a proper continuity between J93 <=> J91B?
*P/H HARNESS ASSY check
6
Is there a proper continuity between P91B <=> J020?
Troubleshooting
Check
(paper), the value is 0VDC.
(no paper), the value is 5VDC.
Level 2 FIP (Fault Isolation Procedure
Treatment
Yes No
Replace and remount
Go to step 2.
the concerned part(s).
Go to step 3. Go to FIP-2.1
Replace the MCU
Go to step 4.
PWB.
Replace the MCU
Go to step 5.
PWB.
Replace the REGI.
Go to step 6. HARNESS ASSY
replacement
Replace the REGI. Replace the P/H
SENSOR. HARNESS ASSY.
Revision C
5-92