COPYRIGHT © 2002 CANON INC. CANON CLC1100/1130/1150/1160/1180 REV.1 FEB. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
9-11
CHAPTER 9 EXTERNALS / AUXILIARY MECHANISMS
C. Protection System
The fuse on the DC fuse PCB is designed to melt if an overcurrent occurs in any of the loads.
Or, the overcurrent protection circuit on the DC power supply PCB will turn on to stop the output
of the DC power supply.
If the overcurrent protection circuit 1 on the DC power supply PCB detects overcurrent, it will
stop output 1 and output 2; output 1 is used to drive the logic system so that its suspension will help
prevent malfunction of the copier. If the overcurrent protection circuit 2 detects overcurrent in the
drive system, on the other hand, the copier will stop output 2 only.
Figure 9-502 Block Diagram of the Protection System
Table 9-505 Protective Functions
DC power supply PCB
Output 1
Output 2
Converter
circuit 1
Conversion
circuit 2
3.3V/5V/-8V
+8V/+8VU
12V/15V
24V-F
24V/38V
Over-
current
detection
circuit 1
Over-
current
detection
circuit 2
Output stop signal 1
Output stop signal 2
Sequence control
circuit
Stops output 2.
Stops outputs 1 and 2.
DC fuse PCB
PCBs
DC power cut
relay (RL3)
Cover switch
(SW3, SW4, SW5)
C
C
15V,38V
38V
3.3V,-8V,+8V,+8VU,12V,24V-F
15V
5V
24V
FU931-FU939
B
FU921-FU925
FU940-FU941
FU901-FU906
B
A
A
Detection by
Overcurrent protection circuit 1
Overcurrent protection circuit 2
Copier operation
Stops outputs 1 and 2
from the DC power
supply PCB.
Stops output 2 from the
DC power supply PCB.
Resetting
Turn off the power switch, and remove
the cause; then, wait for about 3 min,
and turn on the power switch.
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