Epson AcuLaser C8500 Service Manual page 440

EPSON AcuLaser C8500
FIP-2.8 Faulty MSI OHP SENSOR FIP-2.8 Faulty MSI OHP SENSOR FIP-2.8 Faulty MSI OHP SENSOR FIP-2.8 Faulty MSI OHP 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
MSI OHP SENSOR, MSI HARNESS ASSY
REGI. HARNESS ASSY, P/H HARNESS ASSY, MCU PWB
*MSI OHP SENSOR power supply check
2
Is the voltage between P20-11PIN <=> P20-13PIN 5VDC?
*MSI OHP detection signal power supply check
3
Is the voltage between P20-12PIN <=> P20-13PIN 5VDC?
*MSI OHP detection signal check
Is the voltage between P/J20-12PIN <=> P/J20-13PIN as follows?
When
4
When
• Use white paper to check transmission/block status. OHP film is transparent and
therefore cannot be accurately evaluated.
*MSI HARNESS ASSY check
5
Is there a proper continuity between J20B5 <=> P92?
*REGI. HARNESS ASSY check
6
Is there a proper continuity between J92 <=> J91?
*P/H HARNESS ASSY check
7
Is there a proper continuity between P91 <=> J20?
Troubleshooting
Check
(paper), the value is 0VDC.
reflecting
(no paper), the value is 5VDC.
not reflecting
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 MSI
Go to step 6.
HARNESS ASSY.
Replace the REGI.
Go to step 7.
HARNESS ASSY.
Replace the MSI SHORT Replace the P/H
N/P SENSOR. HARNESS ASSY.
Revision C
No
5-88