Fixing Control; Fixing Temperature Control - Canon GP160DF Service Manual

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
Paper type selection
in user mode*1
Bond paper
Plain paper
Special paper
Tracing paper
*1: USER MODE > 05 PRINTER SETTING > 10 SELECT PAPER
COPYRIGHT © 1999 CANON INC.
Resolution
(dpi)
600
1200
600
1200
600
1200
Table 8-201
CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Target temperature (˚C)
Page interval
Print temperature
temperature control
control
175 to 145
190 to 175
170 to 155
155 to 125
175 to 160
160 to 130
150 to 140
140 to 110
145 to 115
160 to 145
130 to 100
137 to 127
CHAPTER 8 FIXING SYSTEM
8-3