Canon GP160DF, Service Manual, Page: 151 / 797

COPYRIGHT © 1999 CANON INC. CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 8 FIXING SYSTEM
8-3
II. FIXING CONTROL
A. Fixing temperature control
1. Overview
This unit’s fixing heater uses two surface heaters, which are installed into one
ceramic base. The heater heats up the fixing film.
The two surface heaters are equipped with ON/OFF switches, which keep the power
consumption low.
The temperature of the fixing heater is monitored by a thermistor (TH1), which is
located on top of the fixing heater. The DC controller PCB CPU (IC301), based on the
fixing heater surface temperature signals, turns ON or OFF the fixing heater drive 1 sig-
nal (FSRDRV1) and the fixing heater drive 2 signal (FSRDRV2). This controls the fixing
heater’s surface temperature so it reaches the stipulated temperature.
During printing, the heater surface temperature setting is based on the following five
conditions:
• When the fixing assembly is warming up, the temperature detects the initial tem-
perature.
• Printing interval (first copy, intermittent copying, multiple copying)
• Paper size
• Resolution (600dpi, 1200dpi)
• Paper type, as selected in the user mode
Table 8-201
Paper type selection
in user mode*1
Resolution
(dpi)
Target temperature (˚C)
Print temperature
control
Page interval
temperature control
Bond paper
Plain paper
Special paper
Tracing paper
600
1200
600
1200
1200
600
190 to 175
170 to 155
175 to 160
150 to 140
160 to 145
137 to 127
175 to 145
155 to 125
160 to 130
140 to 110
145 to 115
130 to 100
*1: USER MODE > 05 PRINTER SETTING > 10 SELECT PAPER