Fixing And Delivery Unit - Canon LBP-860 Service Manual

CHAPTER 2
D. Fixing and Delivery Unit
1. Outline
The upper/lower rollers of the fixing unit
and the delivery rollers are driven by the
main motor (Ml). The upper roller is heated
by a fixing roller heater (H 1: 500 W. 115 V).
The upper roller surface temperature is
detected by a thermistor (THI). As t h e
s u r f a c e t e m p e r a t u r e i n c r e a s e s . t h e
resistance of the thermistor ffH1) decreases,
and the voltage of the FIXING
I(
r-------
2 - 30
SURFACE TEMPERATURE signal (FSRTH)
decreases.
According to the voltage of the FSRTH
signal, the microprocessor (CPU) on the DC
controller makes lhe FIXING ROLLER
HEATER DRIVE signal (/FSRD) "H" or "L"
to set the upper roller surface temperature
to the appropriate value.
The target temperatures of the upper
fixing roller during WAIT, STANDBY, and
PRINT state are listed in Table 2-4.
R O L L E R
Figure 2-36
DC controller PCB
.-_-.-~-.-._._.~__-
+5v
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