Canon CLC 1120 Service Manual page 178

CHAPTER 6 IMAGE FORMATION SYSTEM
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.
Related Error Code
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.
AC power
supply
Environment
switch
SW6
ON
AC fuse PCB
6-26
COPYRIGHT © 1999 CANON INC.
Main switch
SW1
RL1
Control IC
Drum heater controller PCB
To cassette heater
Figure 6-308
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
[1]
DC power
supply PCB
SSR1
To fixing heater
[2]
[3]
SSR2
5V Thermistor
SHUTOFF*
DC driver
PCB
DRHOFF
DRHERR
TH
H3
Drum heater