Controlling The Fixing Temperature - Canon NP6251 Service Manual

C. Controlling the Fixing Temperature
The surface temperature of the machine's upper fixing roller is monitored by the main
thermistor (TH1); measurements are taken and communicated to the microprocessor on
the DC controller PCB.
The DC controller PCB uses these measurements to vary the main heater drive
signal (MHRD) and the sub heater drive signal (SHRD).
The sub thermistor (TH2) is mounted at the rear of the upper fixing roller to check for
an abnormal increase in temperature.
PS47
COPYRIGHT © 1997 CANON INC.
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DC controller PCB
Cleaning belt
guide plate
Upper fixing roller
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Figure 6-102
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 FIXING SYSTEM
PS11
Main thermistor (TH1)
TPI
Thermal
switch
AC power supply
Fixing
lower
roller
SSR
AC driver PCB
6-5