B. Fixing Control
1. Fixing temperature control
The fixing film unit contains a fixing heater of a flat stick shape, which heats the fixing film.
The temperature of the fixing heater is detected by the thermistor (TH901) on the fixing
heater. When the surface temperature rises, the resistance of TH901 drops and the voltage of
the FIXING HEATER TEMPERATURE DETECTION signal (FSRTH) drops.
Based on the voltage of this FSRTH signal, the CPU (IC501) on the engine controller controls
the FIXING HEATER DRIVE signal (FSRDO) so that the fixing heater temperature becomes the
specified value.
This FSRDO signal is generated based on the ZERO-CROSS signal (/ZEROX) output from the
heater control circuit.
Figure 2-2-6
2 - 10
CHAPTER 2
M10
Delivery roller
Main motor
Pressure roller
Fixing heater
(H901)
Temperature fuse
(FU901)
+3.3V
+3.3V
14
8
9
IC30
+3.3V
RL
+3.3V
6
FSRT
2
+3.3
13
1
11
IC30
Fixing film
unit
Thermistor
(TH901)
TB1
Q30
J31-
J31-2
Fuse (FU2)
Relay
(RL101) +24V
Fixing heater control circuit
Fixing heater safety circuit
Engine Controller
6
FSRD
IC50
1
-
+
-
+
+3.3V
1
/ZERO
Zero-cross
detection circuit
THR
TB11
SSR10
Q30
Q30
+3.3V
/HITMP
4
Fuse (FU1)
/PRN
Содержание LBP1760P
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Страница 220: ...B Sensors Figure 4 9 2 4 58 CHAPTER 4 PS104 TH901 PS106 PS501 PS101 PS102 PS103 PS105 PS701 PS703 PS702...
Страница 222: ...C Clutches Solenoids Figure 4 9 4 4 60 CHAPTER 4 SL102 CL101 SL101 SL701...
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