Canon GP160DF Service Manual page 152

CHAPTER 8 FIXING SYSTEM
Reference:
When the amount of time which has lapsed between the delivery sensor (PS306)
detecting the end of one paper, and the next paper passing the through the paper
leading edge sensor (PS301) is less than one second, the temperature control
changes to the paper interval temperature control.
When compared to printing at 1200dpi equivalent, the feeding speed when printing at
600dpi is doubled, and so the fixing target temperature is high. A sudden rise in tem-
perature of the fixing heater end may occur if small-sized paper is used when printing
at 600dpi. In order to prevent this, the throughput is decreased by control of the fixing
assemblys temperature.
DC power supply PCB
Fuse (F2)
Fuse (F1)
+5V
+5V
J203-2
Thermistor
Pressure
roller
Delivery
roller
8-4
J201-4
J201-
Zero cross
detector circuit
+24VA
Relay
(R1)
J201-
J102-1
J102-3
J102-5
Fixing film
unit
J203-1
FSRTH
Thermo-
switch
Fixing
heater
J201-
Main
M601
motor
Figure 8-201
COPYRIGHT © 1999 CANON INC.
DC controller PCB
J305-37
J305-39
J201-
J305-40
Fixing heater safety circuit
Q4
+5V
IC304
RLYD
1
J305-
+5V
IC304
6
-
7
+
5
J305-4
FSRTH
CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
FSRDRV1
FSRDRV2
/ZEROX 19
+5V
2
-
+
3
RLYDRV 100
+5V
FSRTM
+5V
THCHG 43
Q301
1
2
IC301
CPU
/PRNT
25