Canon Vizcam 1000, Service Manual

Page: 525 / 840

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COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
b. E000=XX20, XX30, XX40, XX50 (high-order 2 digits representing type as XX=01 indicating upper
heater and 02, lower heater)
Cause
Fixing thermistor
(open circuit)
Thermistor
Thermistor (dirt)
Environment
Thermistor
DC controller
SSR (short
circuit)
DC controller
PCB
Step
1
2
3
4
5
6
7
Checks
Clear ‘E000’ (*), and turn ON the
power switch. Does the fixing heater
turn ON?
• Check by the eye. Be sure to turn
OFF the power switch immediately
after the check.
Open the front cover and the delivery
assembly to cool the fixing roller.
Close the delivery assembly and the
front cover; then, set the meter to the
5VDC range, and measure the
voltage between J2209A-9 (+: FRST)
and J2209A-10 (–; GND).
Likewise, measure the voltage
between J2209A-11 (+; FRST) and
J2209A-12 (–; GND).
Does the voltage decrease from
about 5 V gradually when the power
switch is turned ON?
• Turn OFF the power switch
immediately after the check.
Is the thermistor (THM1, THM2) in
even contact with the upper fixing
roller?
Clean the area where the thermistor
and the fixing roller are in contact. Is
the problem corrected?
Does the problem occur only when
the machine is turned on for the first
time in the morning?
Replace the thermistor. Is the prob-
lem corrected?
Replace the SSR. Is the problem
corrected?
Yes/No
NO
YES
NO
NO
YES
YES
YES
NO
YES
NO
Action
See “The fixing heater
fails to turn on.”
Go to step 7.
Check the wiring from
J2209A to the fixing
thermistor; if normal,
replace the fixing thermis-
tor.
Re-install it.
End.
• Advise the user that the
operating environment
is outside the specifica-
tion.
• Advise the user not to
turn on the power while
the room is cold.
End.
Replace the DC control-
ler.
End.
Replace the DC controller
PCB.