Protective Functions - Canon iR C3200 Series Service Manual

11.4 Protective Functions

11.4.1 Turning Off the Power Against Overheating (in response to
activation of thermal switch)
Once its contact has opened, the thermal switch will not return to its initial state even after the error temperature has
been corrected. Be sure to replace it.
If the internal temperature of the thermal switch exceeds 222 -/+8 deg C, the thermal switch goes OFF to cut the
power to the fixing heater.
Fuse PCB
DC controller
PCB
J105A
J51
6
J69_7 HRLY_ON
3
J69_9 TR_ERR*
2
J69_11 H2_ON
1 J69_12 H1_ON
TP
Fixing roller
Heater control PCB
J4
J5
RL
Triac short-
circuit Heater
drive
detection
PCB circuit
Q10
Q23 Q11
H1
H2
F-11-15
Chapter 11
0006-0741
CB
Triac short-
circuit Heater
drive
detection
PCB circuit
Q20
Q22 Q21
11-15