Canon NP6621, Service Handbook

Page: 65 / 146

4–1
TROUBLESHOOTING MALFUNCTIONS
CHAPTER 4 TROUBLESHOOTING MALFUNC-
TIONS
1 E000
4
Cause
J47 (relay
connector to
thermistor)
Thermistor
Heater
Thermistor
Fixing
heater driver
PCB
DC control-
ler PCB
Step
1
2
3
4
5
Yes/No
NO
NO
NO
YES
YES
NO
Remedy
Re-connect it.
Replace the upper fixing unit.
Replace the upper fixing unit.
End.
End.
Replace the DC controller
PCB.
Checks
Disconnect the connector J4 of the
fixing heater, and press the power
switch while holding down the service
mode switch. (This will reset E000;
about 2 sec later, the power switch will
turn OFF automatically.)
Is the connection (4-pin connector on
the rear side plate near the fixing
assembly) good?
Let the fixing assembly cool, and
disconnect J47. Is the resistance
between J47-1 and -2 on the ther-
mistor side about 1.4 Mý? Is the
resistance between J47-3 and -4
about 3.7 Mý?
Is there electrical continuity between
J4-1 and -2?
Replace the upper fixing unit. Is the
problem corrected?
Replace the fixing heater driver PCB.
Is the problem corrected?