D. Low-voltage Power Supply Circuit
1. Outline
When the power switch (SW6) is turned ON, the AC power is supplied to the low-voltage power
supply circuit in the power supply unit. This circuit supplies the power, +24VDC and +5VDC,
which are required for the printer, and 3.3/5VDC for the video controller.
Figure 2-2-20
When the power switch (SW6) is turned ON, the power supply circuit sets the POWER OFF sig-
nal (PSWOFF) to “L” and notifies the DC controller that the power switch is ON. The DC con-
troller sets the POWER OFF CONTROL signal (PCONT) to “H” and turns ON the control IC in the
power supply circuit, and the AC power supply is sent to the power supply circuit via the circuit
breaker and the noise filter. +24VDC is supplied for the paper pick up motor, scanner motor
and high-voltage power supply PCB. +5VDC is supplied for the sensors, IC, etc. in the DC con-
troller PCB.
+24VDC consists of +24VA, which is shut OFF when the front door switch (SW4) or the rear
2 - 25
CHAPTER 2
DC controller PCB
CB101
Rectifier
circuit
Power
switch
Circuit
breaker
+24VB
PSWOFF
DC-DC
convertor
Fuse
Switching
transistor
Control IC
DC-DC
Low-voltage power supply circuit
Noise filter
Rush current
prevention circuit
Photo-
coupler
Overcurrect/
overvoltage
detection
circuit
Connector
PCB
F1
/PCONT
24V overcurrent
detection circuit
Transformer
Rectifier
circuit
24V overvoltage
detection circuit
AC power
supply
Feed
PCB
+24V
A
+5V
SW4
SW5
+24V
A
Front door
switch
Video
controller
PCB
+3.3/5V
Multi-
purpose
tray PCB
+24V
A
+5V
Developing
PCB
+24V
A
+5V
High-
voltage
unit
+24V
A
+5V
Density
sensor
+24V
A
+5V
+24VB
Fans
+5V
Sensors
Scanner
motor
Laser
driver
+5V
BD
circuit
+5V
Solenoids/
clutches
+24VA
+24V
A
Option
• Duplexing unit
• Paper feeder
+24VA
+5V
SW6
+3.3/5V
+5V
Rear door
switch
Photo-
coupler
Photo-
coupler
Содержание CLBP-460PS
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Страница 245: ...D Electronic Components 1 Locations Figure 3 9 22 3 75 CHAPTER 3 Duplexing unit driver PCB Power supply unit ...
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Страница 263: ...b Configuration Page The Configuration Page lists the selected options for all Setup menus Figure 4 1 4 4 9 CHAPTER 4 ...
Страница 264: ...c PCL Font List The PCL Font List page lists the printer s resident PCL fonts Figure 4 1 5 4 10 CHAPTER 4 ...
Страница 267: ...f Menu Help An overview of the screens you can access from the control panel is printed Figure 4 1 8 4 13 CHAPTER 4 ...
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Страница 335: ...APPENDIX I GENERAL TIMING CHART A 1 II GENERAL CIRCUIT DIAGRAM A 25 III LIST OF SIGNALS A 29 IV MESSAGE TABLE A 36 ...
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Страница 429: ...DUPLEX UNIT COPYRIGHT C 1998 CANON INC CANON CLBP 460PS REV 0 OCT 1998 PRINTED IN JAPAN IMPRIME AU JAPON CDSi ...
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