SPECIFICATIONS
B465 7-6 SM
3. OVERALL MACHINE CONTROL
3.1 SYSTEM CONTROL
The basic fax unit consists of two PCBs: the FCU and the NCU.
The FCU controls all fax communications and fax features. The NCU switches the
analog line between the fax unit and the external telephone.
Refer to Section 6 of the base copier's service manual for details.
3.2 POWER DISTRIBUTION
The PSU (Power Supply Unit) generates +5V (+5VE) and +24V (+24VE) DC, and
supplies these to the FCU.
The FCU includes regulators that generate +3V (specifically, +3.3V) and +12V for
internal use, as indicated below.
Source Voltage Description
+5VLD* For the LDDR
+12V For the SBU.
+24VES For the lamp stabilizer and DF relay board.
+24VM* For the main motor, polygon motor, PSU, cooling fan, clutches,
power pack, quenching lamp, mechanical counter, optional paper
tray.
+24VE
+24VMM* For the scanner motor and DF motor.
For the Op-port, sensors, and optional printer unit
+3V For the SDRAM, VPL, CIOP, and modem.
+3VA For analog communication processing
+3VBAT Supplied from a long-term lithium battery; backs up the SRAM
(programmed settings) on the FCU.
+3VD
Supplied from a rechargeable lithium battery; backs up stored data
DRAM and on optional IC card (both on the FCU) for 12 hours after
power goes off.
+3VE For the SCP2, flash ROM, and optional DIMM.
+3VV For the thermistor
+5V For the power pack, sensors, DF relay board, and optional paper
tray.
+5VA For analog communication processing
+5VCD For flash memory card
+5VDS For the NCU
+5VHCT For the card I/F
+5VSPD For the monitor speaker
+5VVA For video processing
+5VE
+5VVD For the SBU.
*Supply is cut off if interlock switch is open.
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