Epson AcuLaser C8500, Service Manual

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EPSON AcuLaser C8500 Revision C
Troubleshooting Level 1 FIP (Fault Isolation Procedure) 5-54
FIP-1.25 Fuser malfunction (Overheat) FIP-1.25 Fuser malfunction (Overheat) FIP-1.25 Fuser malfunction (Overheat) FIP-1.25 Fuser malfunction (Overheat)
Step Check
Treatment
Yes No
1
*Initial setting
Use of parts of non-EPSON specifications, improper mounting, damage, distortion, dirt, adherence
of foreign matter?
*Main parts to check
FUSER CONNECTOR, TEMP. SENSOR ASSY,
H/R HEATER, P/R HEATER, FUSER ASSY,
MAIN HARNESS ASSY, MCU PWB
Replace and remount
the concerned part(s).
Go to step 2.
2
*Engine and controller division check
Can a test print (single sheet / consecutive printing, about 10 sheets each) be performed normally
with the engine alone?
Printer controller check
(If an error still occurs
after replacing, go to
step 3.)
Go to step 3.
3
*FUSER CONNECTOR
Is the FUSER CONNECTOR securely connected when the FUSER ASSY is mounted?
Go to step 4.
Check the FUSER
CONNECTOR
4
*TEMP. SENSOR ASSY check
Does the problem occur as soon as the power is turned ON?
Go to FIP-2.27 Go to step 5.
5
*H/R HEATER, P/R HEATER check
Do the H/R HEATER and P/R HEATER light when the FUSER ASSY is cold and the power is turned
ON?
Go to step 6.
Replace the H/R
HEATER and the P/R
HEATER
6 Does the problem occur during the FUSER warm up? Go to FIP-2.27 Go to step 7.
7
*MAIN HARNESS ASSY check
Is there a proper conductivity between J21 <=> J33?
Go to step 8.
Replace the MAIN
HARNESS ASSY.
8
*LVPS check
Is the voltage between P21-3PIN <=> P21-2PIN 5.5VDC?
Go to step 9. Replace the LVPS.
9
*HEATER ROD ON signal check
Is the voltage between P/J33-12PIN <=> P/J33-13PIN as follows?
„
During the FUSER warm-up, the value is 0VDC.
„
When the warm-up is completed, the value changes from 0VDC to 5.5VDC.
Problem solved.
Replace the MCU PWB.