![Canon LBP-1760 Скачать руководство пользователя страница 54](http://html.mh-extra.com/html/canon/lbp-1760/lbp-1760_service-manual_2553210054.webp)
D. Low-Voltage Power Supply Circuit
1. Outline
AC power is supplied to the low-voltage power supply circuit in the engine controller when the
power switch (SW101) is turned ON. The low-voltage power supply circuit su24VDC and
+3.3VDC required for the printer.
+24VDC is supplied to drive the main motor, scanner motor, and fan and to the high-voltage
power supply. +3.3VDC is used for the sensors and ICs on the engine controller PCB. +24VDC
is divided into, +24VA, which is normally supplied from the low-voltage power circuit and,
+24VB, which is interrupted when the door switch (SW101) is turned OFF by opening the upper
cover.
Figure 2-2-8
2. Protective functions
If a shortcircuit or other problems on the load side cause an excessive current flow from the
+24VDC or +3.3VDC power supplies or generate abnormal voltage, the excess-current protec-
tion system and excess-voltage protection system automatically shut off the output voltage to
protect the power supply circuit.
If excess-current or excess-voltage protection system is activated and the power supply cir-
cuit does not output DC voltage, it is necessary to turn the power OFF, correct the problem in
the faulty load, then power the printer ON again.
The circuit has two fuses which break and cut off the output voltage if excess-current flows
through the AC line.
2 - 16
CHAPTER 2
Low-voltage power supply circuit
/ZEROX
+24VA
+3.3V
Noise
filter
Control IC
(IC1)
Switching
FET (Q1)
ACH
Fuse
(FU2)
Fuse
(FU1)
Zero-cross
circuit
Power switch
(SW1)
ACN
To heater control circuit
Transformer
(T1)
Rectification
smoothing
circuit
Constant-
voltage
control
circuit
Protective
circuit
Error state latch
photocoupler
Constant-voltage
control photocoupler
To CPU
Noise
filter
(PC2)
Rectification
smoothing
circuit
(PC1)
Rectification
smoothing
circuit
Содержание LBP-1760
Страница 8: ......
Страница 10: ......
Страница 12: ...This page intentionally left blank 1 2 CHAPTER 1 ...
Страница 23: ...Figure 1 5 1 1 13 CHAPTER 1 100mm 1220mm 600mm 630mm ...
Страница 28: ...Figure 1 5 3 1 18 CHAPTER 1 ...
Страница 34: ...This page intentionally left blank 1 24 CHAPTER 1 ...
Страница 36: ......
Страница 38: ......
Страница 75: ...This page intentionally left blank 2 37 CHAPTER 2 ...
Страница 80: ...Figure 2 5 3 2 42 CHAPTER 2 ...
Страница 83: ...Figure 2 5 6 2 45 CHAPTER 2 ...
Страница 85: ...This page intentionally left blank 2 47 CHAPTER 2 ...
Страница 92: ......
Страница 114: ......
Страница 148: ...4 Remove the screw then take out the paper feeder driver PCB Screw Paper feeder driver PCB Figure 3 8 10 3 34 CHAPTER 3 ...
Страница 160: ......
Страница 162: ......
Страница 195: ...This page intentionally left blank 4 33 CHAPTER 4 ...
Страница 199: ...This page intentionally left blank 4 37 CHAPTER 4 ...
Страница 218: ...IX LOCATION OF ELECTRICAL PARTS A Switches Figure 4 9 1 4 56 CHAPTER 4 SW801 SW802 SW803 SW600 SW601 SW602 SW101 ...
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 ...
Страница 224: ...D Motors Others Figure 4 9 6 4 62 CHAPTER 4 FM101 H901 M101 FM701 M702 M701 ...
Страница 226: ...E PCBs Figure 4 9 7 4 64 CHAPTER 4 ...
Страница 229: ...Figure 4 9 9 4 67 CHAPTER 4 J604 J602 J601 J104 J105 J72 J110 J603 J6 J7 J1 J8 J5 J4 J3 J2 ...
Страница 231: ...APPENDIX I GENERAL TIMING CHART A 1 II GENERAL CIRCUIT DIAGRAM A 3 III LIST OF SIGNALS A 5 IV MESSAGE TABLE A 11 ...
Страница 232: ......
Страница 234: ......
Страница 248: ...PRINTED IN JAPAN IMPRIME AU JAPON 0598 AT 2 50 CANON INC The printing paper contains 70 waste paper ...
Страница 255: ...CD 1 4 COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ...
Страница 256: ...CD 1 5 COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ...
Страница 257: ...CD 1 6 COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ...
Страница 258: ...CD 1 7 COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ...
Страница 259: ...CD 1 8 COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ...
Страница 260: ...CD 1 9 COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ...
Страница 261: ...CD 1 10 COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ...
Страница 262: ...CD 1 11 COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ...
Страница 263: ...CD 1 12 COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ...
Страница 270: ...COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ...
Страница 272: ...CD 2 2 COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ...
Страница 275: ...CD 3 2 COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ...
Страница 277: ......
Страница 278: ...DUPLEX UNIT COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON CDDi ...
Страница 279: ......
Страница 280: ......
Страница 282: ...CDD1 2 COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ...
Страница 286: ......
Страница 287: ...COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON CDFi ENVELOPE FEEDER ...
Страница 288: ......
Страница 289: ......
Страница 291: ...CDF1 2 COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ...
Страница 294: ...COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON CDEi PAPER FEEDER ...
Страница 295: ......
Страница 296: ......
Страница 298: ...CDE1 2 COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ...
Страница 304: ......
Страница 306: ...PRINTED IN JAPAN IMPRIME AU JAPON 0698AB0 50 CANON INC ...
Страница 310: ...COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON iv ...
Страница 312: ...COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON vi ...
Страница 313: ...COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON vii ...
Страница 315: ......
Страница 335: ......
Страница 356: ......
Страница 357: ...Di COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON DUPLEX UNIT R73 5004 ...
Страница 358: ......
Страница 359: ......
Страница 366: ......
Страница 367: ...Fi COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON ENVELOPE FEEDER R73 5005 ...
Страница 368: ......
Страница 369: ......
Страница 377: ...Ei COPYRIGHT C 1998 CANON INC CANON LBP 1760 REV 0 MAY 1998 PRINTED IN JAPAN IMPRIME AU JAPON PAPER FEEDER R73 5006 ...
Страница 378: ......
Страница 388: ......
Страница 392: ......
Страница 394: ...PRINTED IN JAPAN IMPRIME AU JAPON 0698AB2 50 CANON INC The printing paper contains 70 waste paper ...