CHAPTER 6 IMAGE FORMATION SYSTEM
6-26
COPYRIGHT © 2002 CANON INC. CANON CLC1100/1130/1150/1160/1180 REV.1 FEB. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
Each of the signals is used for the following:
[1] SHUTOFF*
It goes ‘0’ when the CPU PCB detects an error (e.g., fault in the fixing heater), thereby
turning off the main switch to cut off the power to the power supply PCB.
[2] DRHOFF
When other heaters are on, it goes ‘1’ to cut off the power to the drum heater and the cassette
heater, thereby reducing power consumption. (100-/120-V model only)
[3] DRHERR
It goes ‘1’ when SSR2 is supplying the drum heater and the cassette heater with power.
Figure 6-308
E062
This error occurs if the DRHERR signal goes ‘1’ while the DRHOFF signal is
‘1’ and SSR2 is supplying the drum heater and the cassette heater with power.
SSR1
RL1
5V
SW1
SW6
ON
H3
DRHOFF
DRHERR
SHUTOFF*
TH
[1]
[2]
[3]
SSR2
AC power
supply
Environment
switch
AC fuse PCB
Main switch
DC power
supply PCB
DC driver
PCB
To fixing heater
Control IC
Thermistor
Drum heater controller PCB
Drum heater
To cassette heater
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