Protective Functions - Canon 1130 Service Manual

B. Protective Functions
The copier is equipped with the following six protective mechanisms to prevent malfunction
of the fixing heater:
a. The DC-CPU monitors the voltage of the thermistor (THM1, THM3). When it detects
210ºC or more, the copier will indicate 'E000' on the control panel, generate SHUTOFF*
signal, and turn off the main switch (SW1).
b. If the copier detects that the SSR is on (USSRD or LSSRD=1) in the absence of the heater
drive signal from the DC-CPU, the copier will indicate 'E000' on the control panel, and
will cut off the power to the fixing heater.
c. If the gate array detects that the difference in thermistor voltage between THM1 and THM2
(upper thermistors) or between THM3 and THM4 (lower thermistors) is about 1.6 V (about
50ºC) or more, the copier will indicate 'E000' on the control panel, and will cut off the
power to the fixing heater.
d. If the gate array detects that the voltage of any of the four thermistors (THM1, THM2,
THM3, THM4) is about 1.0 V (about 220ºC) or more, 'E000' will be indicated on the
control panel and, thereafter, the power to the fixing heater will be cut.
e. If the SSR is on (USSRD or LSSRD=1) in the absence of heater drive signal from the DC-
CPU, the copier will indicate 'E004' on the control panel, and will cut off the power to the
fixing heater.
f. If the internal temperature of the fixing thermal switch (TP2, TP3) of the upper roller or the
lower roller exceeds about 220ºC, the copier will turn off the respective thermal switch and
the power to the fixing heater.
Once open, the contact of a thermal switch will not close (even after recovery
to normal temperature). Do not use a thermal switch whose contact has
opened once.
Resetting E000/E008
1) Remove the cause.
2) Start service mode, and select FUNCTION>CLEAR>ERROR.
3) Press the OK key.
4) End service mode, and turn off and then on the power switch.
COPYRIGHT © 2002 CANON INC. CANON CLC1100/1130/1150/1160/1180 REV.2 FEB. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 8 FIXING SYSTEM
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