Dc Controller/Dc Power - Canon PC400 Service Manual

CHAPTER 4 TROUBLESHOOTING MALFUNCTIONS
11. (paper feeding normally)
Cause
Copy paper
Sensor lever
Delivery sensor PCB
(Q801)
DC controller/DC
power supply PCB
12. (at time of jam)
Cause
Control panel PCB
DC controller/DC
power supply PCB
13. The fixing heater fails to operate.
Cause
Heater (H1),
Thermal fuse (FU2)
Thermistor
(TH1, TH2)
Fixing assembly
DC controller/DC
power supply PCB
4-6
Step Checks
1 Are there pieces of copy paper in
the delivery assembly or pick-up
assembly?
2 Is the movement of the delivery
sensor and pick-up sensor levers
smooth?
3 Replace the delivery sensor
PCB. Does the copier operate
normally?
Step Checks
1 Replace the control panel PCB.
Does the indicator go ON?
Step Checks
1 Is continuity present between
terminals of the heater?
2 Is the resistance between the
following terminals on the control
panel PCB 0Ω or about 1.3 MΩ?
TH1 J603-1
3 Replace the fixing assembly.
Is the problem corrected?
YES/NO
YES
NO
YES
NO
YES/NO
YES
NO
YES/NO
NO
YES
J603-2
YES
NO
Remedies
Remove the pieces of
paper.
Correct the movement.
End.
Check the wiring from the
control panel PCB to the

DC controller/DC power

supply PCB; if normal,
replace the DC
controller/DC power
supply PCB.
Remedies
End.
Replace the DC controller/
DC power supply PCB.
Remedies
Replace the fixing
assembly.
Replace the fixing
assembly.
End.
Replace the DC controller/
DC power supply PCB.