Error Detection Circuit; Outline - Canon NP7160 Service Manual

C. Error Detection Circuit

1. Outline

The copier's error detection circuit is constructed as shown in Figure 6-104, and monitors the
following items for an error:
• Surface temperature of the upper fixing roller
• Activation of the fixing heater (H1)
Fixing assembly
TH1
TH2
+5V
DC controller PCB
COPYRIGHT © 1998 CANON INC.
J201
H1 TSW
-2
-1
+5V
Buffer
+
-
+5V
Buffer
-
+
Figure 6-104
CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 FIXING SYSTEM
CB1
CB2
RL1
AC
driver
J210
+24V
-1
-2
Power supply PCB
HVT
+5V
Gate
array
timer
Converter
AC power line
DC signal line
LF
DS1
RL
Error
detection
circuit
IC113 IC119
Heater ON
detection CPU
6–5