November 29, 1999
POWER DISTRIBUTION
1-15
Overall
Information
1.4 POWER
DISTRIBUTION
1.4.1 DISTRIBUTION DIAGRAM
The PSU su24V, -12V and +5V dc power to the FCU. The FCU controls
fusing lamp AC power supply
Item
Description
+24V
This is interrupted when the machine is in Level 2 energy saver mode (low power
standby).
+24VE
Normally supplied by the PSU when the main switch is on.
Activated when the CPU detects an activation signal from the OPIF board, NCU or
Printer unit when the machine is in energy saver mode.
+24VM
This is interrupted if the interlock switch opens.
+24VMM
For the scanner, paper feed, and main motors.
+24VPP
For the power pack.
+12V
For the SG3 and SiG4 board though the OPIF board.
+12VP
For the function upgrade card and FOD card.
+12VSBU
For the SBU.
-12VE
Normally supplied by the PSU when the main switch is on.
-12V
For the SG3 and SiG4 board though the OPIF board.
-12VOP
For the operation panel.
+5VE
Normally supplied by the PSU when the main switch is on.
Activated when the CPU detects an activation signal from the OPIF board,
document feeder, or operation panel when the machine is in energy saver mode.
FCU
P S U
Fusing Lamp
AC
Main
Power
AC Switching
Circuit
LDDR
Fusing Lamp
ON/OFF
Switching
Circuit
+24VE
+12V
SG3/G4
Unit
NCU
+5VE
+5V
+24VE
+5VE
PC Fax
Expander
+5VE
NIC Fax
Unit
+24VE
+12V
+5VE
+5V
Paper Feed
Unit
+24V
+5V
Paper Feed
Unit
+24V
+5V
+5V
JBIG
+5V
+5VD
2M/4M
Memory
Card
+5V
FOD/
Function
Upgrade
Card
Printer
Interface
+24VE
Controller
+5VE
+5V
+5VC
+5VC
Printer Unit
Operation Panel
+5VOP
+5VE
-12VOP
P o w e r P a c k
+24VPP
+5V
Sensors
+5V
SBU
Lamp Stabilizer
Stamp
Clutches
Main Motor
Fan Motor
Polygon Motor
+24VM
Scanner Motor
Paper Feed Motor
OPIF
AC115V or
230V
+12SBU
+24VMM
+24VM
NIB
+24VM
Main Switch
+24VM
Regulator
+5VLD
Interlock Switch
+5VLD
Regulator
+12V
+24V
+24VE
-12VE
+5VE
+24VE
N C U
: Option
H306V506.WMF