40055101TH Rev.4
432 /
Explanation on Operation
(1)
Noise filter circuit
The noise filter consists of L and C to reduce the normal mode noise and common mode noise
incoming from the AC line.
(2)
Rectifying and smoothing circuit
The input AC voltage is rectified by diodes D1 to D4 and smoothed by capacitor C6 for DC
voltage supply to the inverter. The rash current at power ON is prevented by TH1.
(3)
Switching circuit (RCC type)
This flyback converter (RCC) type switching circuit converts the DC input current to a high
frequency pulse train by switching Q1 ON and OFF. Energy is accumulated in the primary
winding of transformer T1 during the Q1 OFF period, and the accumulated energy is released to
the secondary side in the OFF period for power supply. On/OFF control is performed by gate
voltage control by Q3 via photocoupler PC1 from 5V output.
The overcurrent protection circuit is actuated upon rise in the Q3 base voltage through ZD2 when
the voltage of the bias winding as positive feedback rises due to the rise in the load current. When
a voltage exceeding the zenor voltage of ZD4 and ZD5 is input, ZD4 and ZD5 become conductive
to actuate the overvoltage protection circuit.
If the input voltage is excessive, ZD4 and ZD5 are broken down in the short mode to operate the
overcurrent protection circuit to reduce the output voltage.
The overcurrent protection circuit is automatically reset after the overcurrent state is eliminated.
If ZD4 and ZD5 are broken down by shorting, they should be replaced for recovery from the
overvoltage state.
0
0
0
Q1 drain-source
voltage waveform
Q1 drain current
waveform
Q1 gate voltage
waveform
Fig. 1
Fig. 2
Fig. 3
Содержание B4100
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Страница 545: ...40055101TH Rev 4 545 54 SECTION 1 CABINET ASSEMBLY FAX NIP FX048...
Страница 548: ...40055101TH Rev 4 548 SECTION 2 UNIT PRINTER...
Страница 550: ...40055101TH Rev 4 550 SECTION 3 UNIT 048 OPE PANEL...
Страница 552: ...40055101TH Rev 4 552 SECTION 4 OPEPANEL OPERATION PANEL ASSEMBLY...
Страница 554: ...40055101TH Rev 4 554 SECTION 5 FRAME ASSEMBLY SCANNER L...
Страница 556: ...40055101TH Rev 4 556 SECTION 6 PLATE ASSEMBLY SCANNER B...
Страница 558: ...40055101TH Rev 4 558 SECTION 7 PLATE ASSEMBLY SCANNER R...
Страница 560: ...40055101TH Rev 4 560 17 16 15 10 SECTION 8 FRAME ASSEMBLY SCANNER U...
Страница 562: ...40055101TH Rev 4 562 13 SECTION 9 COVER ASSEMBLY TOP...
Страница 564: ...40055101TH Rev 4 564 SECTION 10 PLATE ASSEMBLY BASE...
Страница 569: ...40055101TH Rev 4 569 SECTION 12 PRINTER HEAT ASSY...
Страница 571: ...40055101TH Rev 4 571 SECTION 13 CABLES...
Страница 574: ...40055101TH Rev 4 574 SECTION 1 CABINET ASSEMBLY...
Страница 576: ...40055101TH Rev 4 576 SECTION 2 CONTROL PANEL ASSEMBLY OKIFAX 5200 5300...
Страница 577: ...40055101TH Rev 4 577 SECTION 2 CONTROL PANEL ASSEMBLY OKIFAX 5500 5600...
Страница 579: ...40055101TH Rev 4 579 SECTION 3 PRINTER ASSEMBLY...
Страница 582: ...40055101TH Rev 4 582 SECTION 4 BASE ASSEMBLY 30 37 38...
Страница 585: ...40055101TH Rev 4 585 SECTION 5 SCAN UNIT...
Страница 587: ...40055101TH Rev 4 587 SECTION 6 PAPER GUIDE U ASSEMBLY...
Страница 589: ...40055101TH Rev 4 589 SECTION 7 CABLES 10...
Страница 591: ...40055101TH Rev 4 591 SECTION 8 OPTION TELEPHONE US...
Страница 594: ...40055101TH Rev 4 594 SECTION 8 OPTION TELEPHONE UK ITA NOR DEN BEL...
Страница 597: ...40055101TH Rev 4 597 SECTION 8 OPTION TELEPHONE HOL GER FRA SWITZ AUT INT L...
Страница 615: ...40055101TH Rev 4 615 5 2 PCB Layout TQSB 2PCB PU FG CONTROLLER MOTOR DRIVER SEN2 MOTOR OSC SEN1...
Страница 616: ...40055101TH Rev 4 616 Figure 6 1 6 PARTS LIST SECTION1 CABINET CASSETTE ASSEMBLY 7 2 8 1 6 5 3 4 O P...
Страница 617: ...40055101TH Rev 4 617 SECTION2 MECHANICAL ASSEMBLY Figure 6 2 0 D A E C K B L 9 M F H N G R Q S T U V J I B A B A...