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October 9th, 1995
1.7. POWER DISTRIBUTION
AC Power
Main SW
AC Switching
Circuit
+5V
- 5V
+24V
PSU
+12V
Cooling Fan Motor
ADF Exp. Cover
Interlock SW
Platen Cover
Interlock SW
The PSU supplies +24V, +5V, -5V, and +12V to the machine through the
MBU.
The ac switching circuit on the PSU generates one +24V supply. This supply
also goes to the interlock switches. If the ADF exposure cover interlock
switch is closed, the +24V SDU supply is generated, and this is supplied to
the SDU board. If the platen cover interlock switch is closed, the +24V ADU
supply is generated, and this is supplied to the ADU board.
The SCU board provides +5V terminator power to the SCSI connector.
There are four LEDs on the MBU (one on each power line) to indicate the
condition of each power supply.
SBU
+5V
-5V
+12V
+5V
+5V
LED 2
-5V
-5V
LED 4
+12V
+12V
LED 3
+24V
+24V
LED 1
+24V SDU
+24V ADU
MBU
+5V
+5V
SCU
+5V
+5V
SIMM
IEU
1-13
OVERALL MACHINE INFORMATION
POWER DISTRIBUTION
+5V
+5V
+5V
+5V
+5V
+24V ADU
ADU
+24V
+24V
+24V
+24V
ADU
ADU
ADU
ADU
+24V SDU
+5V
+24V SDU
SDU
+24V SDU
Scanner Indicator
Panel
+5V
Home Position SN
+5V
+5V
DCU, VIU
Read SN
+5V
ADP
+5V
Scanner Motor
Xenon Lamp
G404V500.wmf
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