Epson AcuLaser C8500 Service Manual page 443

EPSON AcuLaser C8500
Step
*Initial setting
Use of parts of non-EPSON specifications, improper mounting, damage, distortion, dirt,
adherence of foreign matter?
1
*Main parts to check
OHP SENSOR, REGI. HARNESS ASSY
P/H HARNESS ASSY, MCU PWB
*FRONT OHP SENSOR power supply check
2
Is the voltage between P020-17PIN <=> P020-15PIN 5VDC?
*FRONT OHP detection signal power supply check
3
Is the voltage between P020-16PIN <=> P020-15PIN 5VDC?
*FRONT OHP detection signal check
Is the voltage between P020-16PIN <=> P020-15PIN as follows?
When
reflecting
4
When
not reflecting
• Use white paper to check transmission/block status. OHP film is transparent and therefore
cannot be accurately evaluated.
*REGI. HARNESS ASSY continuity check
5
Is there a proper continuity between J98 <=> J020B?
*P/H HARNESS ASSY check
6
Is there a proper continuity between P91 <=> J020B?
Troubleshooting
Check
(paper), the value is 0VDC.
(no paper), the value is 5VDC.
Level 2 FIP (Fault Isolation Procedure
Treatment
Yes
Replace and remount
Go to step 2.
the concerned part(s).
Go to step 3. Go to FIP-2.1
Go to step 4. Replace the MCU PWB.
Replace the MCU PWB. Go to step 5.
Replace the REGI.
Go to step 6.
HARNESS ASSY.
Replace the OHP Replace the P/H
SENSOR. HARNESS ASSY.
Revision C
No
5-91