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30 November, 1999
1.6 POWER DISTRIBUTION
1.6.1 DISTRIBUTION DIAGRAM
A C
Main
P o w e r
Main Switch
PSU
AC Switching
Circuit
24VIN
Fusing Lamp
O N / O F F
Switching
Circuit
F u s i n g L a m p
The PSU supplies +24V dc power to the FCU. The FCU converts the +24V into the
following supplies:
+5V
Normally on when the main switch is.
+5VE
Detects an activation signal from the NCU, document feeder, or operation panel
when the machine is in energy saving mode.
+5VT
For the thermistor.
+5VLD
Supplies the laser diode. It is interrupted if the fusing unit cover interlock switch
opens.
+5VV
This is a more stable power supply than +5V. It is used for the contact image
sensor.
+5VD
Supplies back up power for the DRAM and the optional IC card on the FCU. It can
back up stored data for one hour after the power is switched off. A rechargeable
battery on the FCU generates +5VD.
+5VBAT
Supplies back up power to the system RAM on the FCU to back up the
programmed data. A lithium battery generates +5VBAT.
+24V
Normally on when the main switch is.
+24VD
This is interrupted if the fusing unit cover interlock switch opens.
+24VIN
Supplies +24V to the fusing unit on/off switching circuit. It is interrupted if the fusing
unit cover interlock switch opens.
+24VMM
For the scanner, paper feed, and main motors.
+24VPP
For the power pack.
-9V
For the image sensor.
+5VP
For the optional IC card.
IC
P a p e r F e e d
P o l y g o n
C a r d
Unit
M o t o r
+ 1 2 V
- 9 V
D C - D C
Converter
+ 5 V
D C - D C
+ 2 4 V
Converter
+ 5 V E
2 4 V M
2 4 V D
+ 5 V
+5VLD
Interlock
Switch
L D D R
1-17
POWER DISTRIBUTION
Main
P a p e r F e e d
M o t o r
Clutch
+ 2 4 V M M
Paper Feed
FCU
+ 2 4 V M
Fusing Fan
+ 2 4 V P P
Power Pack
+ 5 V T
Thermistor
+ 5 V
Sensors
+ 5 V
+ 5 V O P P
+ 5 V E
D C - D C
Operation Panel
Converter
+ 2 4 V M M
Scanner Motor
+ 2 4 V
Toner End
Sensor
N C U
Image Sensor
H545V531.WMF
Motor
+ 5 V
-9V
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