Power Distribution; Distribution Diagram - Ricoh FAX3700l Service Manual

OVERALL MACHINE INFORMATION

POWER DISTRIBUTION

1.6. POWER DISTRIBUTION

1.6.1. Distribution Diagram *

AC
Main
Power
Main Switch
PSU
AC Switching
Circuit
24VIN
Fusing Lamp
ON/OFF
Circuit
Fusing
Lamp
The PSU supplies +24V dc power to the FDU. The FDU converts the +24V
dc power supply to the following supplies.
This is normally on when the main switch is on.
+5V
This is used for detecting an activation signal from the NCU, document feeder,
+5VE
or operation panel when the machine is in energy saving mode.
This supplies the laser diode. It is interrupted if the fusing unit cover interlock
+5VLD
switch opens.
This is a more stable power supply than +5V. It is used for the Contact Image
+5VV
Sensor.
This supplies back up power for the DRAM and the optional IC card on the
FCE. It can back up stored data for one hour after the power is switched off.
+5VD
A rechargeable battery on the FDU is used to generate +5VD.
This supplies back up power to the system RAM on the FCE to back up the
+5VBAT
programmed data. A lithium battery is used to generate +5VBAT.
This is normally on when the main switch is on.
+24V
+24VD This is interrupted if the fusing unit cover interlock switch opens.
This supplies +24V to the fusing unit on/off switching circuit. It is interrupted if
+24VIN
the fusing unit cover interlock switch opens.
This is interrupted if the machine enters energy saving mode.
+24VM
-5V This is used for the image sensor.
+12VP This is supplied to the Flash ROMs on the FCE and the optional IC card.
Optional 100
IC Optional
Sheet
Card Counter
Cassette
+12VP
+5V
+24VM
+24VD
+5VD
+5V
+12VD
+5VBAT
+5VD
+5V
12VP
DC-DC
Converter
+5V
+24V
DC-DC
Converter
+5VE
+24VM
+5vv
-5V
+24VD
+5VLD
Fusing Unit
Interlock
Switches
1-20
Printer RS232C
I/F I/F
+24V +5V
+5V
FDU
FCE
+5VD
DC-DC
Converter
Image Sensor
LDDR NCU
LED Array
August 2nd, 1995
+24VM
+5V
Optional PFU
+24VM
Motors
+24VD
Feed Clutch
+24VD
Stamp
+24VD
Cooling Fan
Ozone Fan
+24VD
Power Pack
+5V
Thermistor
+5V
Printer Sensors
+5V
+5VE
Operation Panel
Scanner Sensors
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