40055101TH Rev.4
420 /
2)
Fuser unit temperature control
The heater in the fuser unit is controlled by the thermister, IOGA3 and CPU to keep the
heater roller surface within a prescribed temperature range. The CPU supervises the status
of the port PC0 periodically, turning HEATON signal on and off according to CPU of PC0
(A/D converter input section) status to exercise temperature control.
At power on time, the CPU switches the output signal THON from pin 65 (between high
and low states) to check for a blown or shorted thermister according to the status of the
THCHK signal.
A built-in thermostat in the fuser unit prevents the heater from being overheated in event of
failures in the thermister, or temperature control circuit, etc.
Figure A3.2.18 shows the fuser unit temperature control.
Note: Heater control
Temperature of the heater at the time of printing is 150 ˚C to 180 ˚C. This temperature is
maintained by controlling the on and off operation of heater according to the input of the
thermister converted into analogue-digital (A/D) values by the CPU.
Filter
ACIN
SW1
F1
L101, R1, etc.
IC2
HEAT-N
THERM
5 V
5 V
AOUT
C4
L2
PC1
D1
1VP/2VP (Power supply unit)
M17
Thermostat
Thermister
Heater
Fuser unit
CPU
IOGA
0 V
PA11
PC0
Heater
control
HEATON
CN1
B7
HEAT-N
TR506
THON
65
87
THCHK
A12
IC18, TR502
Figure A3.2.18 Fuser Unit Temperature Control
Summary of Contents for B4100
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Page 548: ...40055101TH Rev 4 548 SECTION 2 UNIT PRINTER...
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Page 552: ...40055101TH Rev 4 552 SECTION 4 OPEPANEL OPERATION PANEL ASSEMBLY...
Page 554: ...40055101TH Rev 4 554 SECTION 5 FRAME ASSEMBLY SCANNER L...
Page 556: ...40055101TH Rev 4 556 SECTION 6 PLATE ASSEMBLY SCANNER B...
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Page 564: ...40055101TH Rev 4 564 SECTION 10 PLATE ASSEMBLY BASE...
Page 569: ...40055101TH Rev 4 569 SECTION 12 PRINTER HEAT ASSY...
Page 571: ...40055101TH Rev 4 571 SECTION 13 CABLES...
Page 574: ...40055101TH Rev 4 574 SECTION 1 CABINET ASSEMBLY...
Page 576: ...40055101TH Rev 4 576 SECTION 2 CONTROL PANEL ASSEMBLY OKIFAX 5200 5300...
Page 577: ...40055101TH Rev 4 577 SECTION 2 CONTROL PANEL ASSEMBLY OKIFAX 5500 5600...
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Page 585: ...40055101TH Rev 4 585 SECTION 5 SCAN UNIT...
Page 587: ...40055101TH Rev 4 587 SECTION 6 PAPER GUIDE U ASSEMBLY...
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