Canon LBP-860 Service Manual page 187

M - 22
Possible rause
Broken
thermistor
wire
Fixing roller
controller
PCB
Power supply
DC controller
Note:
If this message is displayed, turn the power OFF, and do not switch the power ON for
about ten minutes.
If you switch the power ON within ten minutes, the printer will automatically shut OFF
the current to the fting roller heater to prevent overheating.
Possible cause step
EP-E cartridge
Laser/scanner
unit
DC controller
PCB
6-40
Download Service Manual and Resetter Printer at http://printer1.blogspot.com
Check
10 on the DC
PCB and connectors 5741
and 5743 on the connector PCB
making good contact?
Remove Lhe f&ng unit and measure
2
the resistance between connectors
180 to 280 kQ (at room temperature)?
Remove the fling unit. Is there
3
continuity beiween connector 5743-1
and 5743-8 on the fbdng unit?
Open the delivery cover and let the
fixing roller cool. Close the cover and
switch the power ON. Is the voltage
between connectors J212-1 (/FSRD)
and TBZOl-6 IGND) on the IX
controller PCB initially about 5.1 VDC.
and does it change to about 1.5 VDC
roller warms
as the 0xln.g
Switch the power ON. Is the voltage
between ronneclors 5212.2 (RJD) and
PCB about 5 VDC?
Check
Is the laser beam shutter open/close
boss of the EP-E cartridge damaged?
Are connetors 5205 and 5206 on the
DC controller PCB making good
contact?
N O
N O
N O
N O
up?
YES
the DC controller
N O
Procedure
Reattach the connectors
Check the wiring from
connector 5210 on the DC
controller PCB to the
thermistor. If whlng is
proper. replace the
thermistor.
Check continuity in the
fixing roller heater and
thermoswitch individually.
Replace any defective parts
Replace the DC controller
Replace the power supply.
Replace the DC controller
PCB.
Procedure
Replace the cartridge.
Check by using the laser
Reattach the connecters.