Canon LBP-860 Service Manual page 187

ClMPTER 6
M - 22 "5F-50 SERVICE" Message
Possible rause step
Conner1er
Broken
2
thermistor
wire
Fixing roller
3
heawr
Lhermoswitch
controller
DC
PCB
Power supply
DC controller
PCB
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.
1 M - 23 "5F-51 SERVICE" Message
1
Possible cause step
EP-E cartridge
Laser/scanner
unit
DC controller
PCB
6-40
Check
connector
10 on the DC
Are JZ
rontroller
PCB and connectors 5741
and 5743 on the connector PCB
making good contact?
Remove Lhe f&ng unit and measure
the resistance between connectors
5743-6 and J743-7. Is the resistance
180 to 280 kQ (at room temperature)?
Remove the fling unit. Is there
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
(GND) on
TB201-6 the DC controller
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?
:'ZSUll
N O
Reattach the connectors
N O
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
N O
fixing roller heater and
thermoswitch individually.
Replace any defective parts
N O
Replace the DC controller
PCB.
up?
YES
Replace the power supply.
N O
Replace the DC controller
PCB.
1
LSUli
YES
Replace the cartridge.
YES
Check by using the laser
malfunction diagnostic
llowchart in Section III C.
NO
Reattach the connecters.
Procedure
Procedure