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Chapter 1 Troubleshooting
FIP1.27 FUSER ASSY
Step Check
Yes
No
Possible causes:
FUSER ASSY (PL8.1.20)
HVPS/MCU (PL12.1.19)
INTERLOCK S/W 24V (PL8.1.11)
HARNESS ASSY FUSER 100V/200V (PL8.1.17)
HARNESS ASSY AC100V/200V (PL12.1.8)
LVPS (PL12.1.5)
HARNESS ASSY LVPS (PL12.1.1)
1
Checking Heater circuit for continuity
Remove SHIELD PLATE LVPS. (RRP12.1)
Disconnect P/J47 from LVPS.
Is there continuity between
J47-1 and J47-5?
J47-1 and J47-3?
Go to step 3.
Go to step 2.
2
Checking HARNESS ASSY FUSER for continuity
Remove FUSER ASSY. (RRP8.8)
Warning; Start the operation after the FUSER ASSY
have cooled down.
Is there continuity between
J4647B-3 and J47-1?
J4647B-2 and J47-3?
J4647B-1 and J47-5?
Replace FUSER
ASSY. (RRP8.8)
Replace HAR-
NESS ASSY
FUSER. (RRP8.7)
3
Checking Fuser power source voltage
Disconnect P/J48 from LVPS.
Remove EP CARTRIDGE.
Turn the power to ON.
Is the voltage across P/J48-1 and P/J48-3, commercial
voltage?
Go to step 5.
Go to step 4.
4
Checking AC line voltage
Is the AC line voltage the commercial voltage?
Replace HAR-
NESS ASSY
AC100V/200V
(RRP12.4)
Inform the client or
the electrician.
5
Checking Heater Rod ON signal voltage
Make sure FUSER ASSY is cooled down.
Make sure that EP CARTRIDGE is removed.
Is the voltage across P/J41-13(+) and P/J41-12(+) and
P/J41-3(-), 0VDC when Heater Rod lights on, and
3.3VDC when off?
Go to step 7.
Go to step 6.
6
Checking HARNESS ASSY LVPS for continuity
Disconnect P/J11 from HVPS/MCU.
Is there continuity between
P/J41-1 and P/J11-16?
P/J41-9 and P/J11-8?
P/J41-10 and P/J11-7?
P/J41-12 and P/J11-5?
P/J41-13 and P/J11-4?
Replace HVPS/
MCU.
(RRP12.10)
Replace HAR-
NESS ASSY LVPS.
