R51
A3 - 17
40672201TH Rev. 4
2)
Fuser unit temperature control
The heater in the fuser unit is controlled by the thermister, IOGA4 keeps the heater
roller surface within a prescribed temperature range. The IOGA4 supervises the
status of THCHK (A/D converter input section) periodically, turning HEATON signal
on and off according to IOGA4 of THCHK status to exercise temperature control.
At power on time, the IOGA4 switches the output signal THON from pin 59 (be-
tween 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 A3.1.14 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 IOGA4.
2)-1
Heater control
The ACON control signal on the secondary side is transmitted to the primary side
via PC4 to turn triac TRA1 for AC voltage supply to the heater.
Figure A3.1.14 Fuser Unit Temperature Control
IC2
47
59
27
Heater
on/off circuit
IOGA4
HEAT-N
R51
0V
0V
ACIN
F1
THCHK
5V
TRA1
AOUT
PC4
MPW1446/MPW1546
Thermostat
Thermistor
Heater
Fuser unit
THCHK
THON
IOGA4
P2H Board
THCHK
THON
+5V
ACON
CN7
10
CN6
13
IC2
HEATON
Содержание OKIOFFICE84
Страница 7: ...40672201TH Rev 4 CHAPTER 1 GENERAL INFORMATION...
Страница 44: ...40672201TH Rev 4 CHAPTER 2 INSTALLATION PROCEDURE...
Страница 120: ...40672201TH Rev 4 CHAPTER 3 BRIEF TECHNICAL DESCRIPTION...
Страница 128: ...40672201TH Rev 4 CHAPTER 4 MECHANICAL DISASSEMBLY AND REASSEMBLY...
Страница 133: ...4 5 40672201TH Rev 4 Appearance of the OKIOFFICE84 OKIFAX 4500 FX051 CP4 Fig 01...
Страница 155: ...40672201TH Rev 4 CHAPTER 5 ADJUSTMENTS...
Страница 159: ...40672201TH Rev 4 CHAPTER 6 CLEANING AND MAINTENANCE...
Страница 187: ...40672201TH Rev 4 CHAPTER 7 TROUBLESHOOTING AND REPAIR FOR OKIOFFICE84 OKIFAX 4500...
Страница 232: ...40672201TH Rev 4 CHAPTER 8 DIPSWITCHS SETTING TABLES...
Страница 254: ...40672201TH Rev 4 Appendix A PC Board Descriptions and Operation Second Edition December 1998 Oki Data Corporation...
Страница 255: ...40672201TH Rev 4...
Страница 313: ...40672201TH Rev 4...
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Страница 337: ...40672201TH Rev 4 C 6 Reading...
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Страница 357: ...40672201TH Rev 4 C 26 Low Voltage Low Voltage High Voltage High Voltage...
Страница 358: ...C 27 40672201TH Rev 4...
Страница 361: ...40672201TH Rev 4 C 30 Low Voltage secondary High Voltage primary...
Страница 365: ...40672201TH Rev 4 C 34 Low Voltage secondary High Voltage primary...
Страница 370: ...C 39 40672201TH Rev 4 High Voltage primary Low Voltage secondary...
Страница 383: ...40672201TH Rev 4 C 52...
Страница 387: ...40672201TH Rev 4 C 56...
Страница 390: ...40672201TH Rev 4...
Страница 393: ...OKIOFFICE84 OKIFAX 4500 40672201TH Rev 4 D 2 SECTION 1 CABINET ASSEMBLY FAX NIP FX051...
Страница 396: ...OKIOFFICE84 OKIFAX 4500 D 5 40672201TH Rev 4 SECTION 2 UNIT PRINTER...
Страница 398: ...OKIOFFICE84 OKIFAX 4500 D 7 40672201TH Rev 4 SECTION 3 UNIT 051 OPE PANEL...
Страница 400: ...OKIOFFICE84 OKIFAX 4500 D 9 40672201TH Rev 4 SECTION 4 OPEPANEL OPERATION PANEL ASSEMBLY...
Страница 402: ...OKIOFFICE84 OKIFAX 4500 D 11 40672201TH Rev 4 SECTION 5 FRAME ASSEMBLY SCANNER L...
Страница 404: ...OKIOFFICE84 OKIFAX 4500 D 13 40672201TH Rev 4 SECTION 6 PLATE ASSEMBLY SCANNER B...
Страница 406: ...OKIOFFICE84 OKIFAX 4500 D 15 40672201TH Rev 4 SECTION 7 PLATE ASSEMBLY SCANNER R...
Страница 408: ...OKIOFFICE84 OKIFAX 4500 D 17 40672201TH Rev 4 SECTION 8 FRAME ASSEMBLY SCANNER U...
Страница 410: ...OKIOFFICE84 OKIFAX 4500 D 19 40672201TH Rev 4 SECTION 9 COVER ASSEMBLY TOP...
Страница 412: ...OKIOFFICE84 OKIFAX 4500 D 21 40672201TH Rev 4 SECTION 10 PLATE ASSEMBLY BASE...
Страница 414: ...OKIOFFICE84 OKIFAX 4500 D 23 40672201TH Rev 4 SECTION 11 PRINTER BASE FRAME UNIT Heat assy...
Страница 417: ...OKIOFFICE84 OKIFAX 4500 40672201TH Rev 4 D 26 SECTION 12 PRINTER HEAT ASSY...
Страница 419: ...OKIOFFICE84 OKIFAX 4500 40672201TH Rev 4 D 28 SECTION 13 CABLES...
Страница 421: ...40672201TH Rev 4 Appendix E Boards Layout OKIOFFICE84 OKIFAX 4500 Second Edition December 1998 Oki Data Corporation...
Страница 422: ...40672201TH Rev 4...
Страница 424: ...E 1 40672201TH Rev 4...
Страница 425: ...40672201TH Rev 4 E 2...
Страница 426: ...E 3 40672201TH Rev 4...
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Страница 433: ...40672201TH Rev 4 E 10...
Страница 434: ...E 11 40672201TH Rev 4...
Страница 435: ...40672201TH Rev 4 Appendix F PC Loading Second Edition December 1998 Oki Data Corporation...
Страница 436: ...40672201TH Rev 4 FX 051 SYSTEM SPECIFICATION PC LOADING PART Ver 00 11 Oki Data Confidential...
Страница 448: ...40672201TH Rev 4 Appendix G RMCS SYSTEM MANUAL For Model 30 Second Edition December 1998 Oki Data Corporation...
Страница 473: ...40672201TH Rev 4 H 18 Figure 2 1 IC16 Pin 77 IC16 Pin 78 IC16 Pin 79 IC16 Pin 80...
Страница 481: ...40672201TH Rev 4 Appendix I FAX2NET FUNCTION First Edition October 1999 Oki Data Corporation...