3. EXIO1, EXIO2 (External I/O)
•
Serial interface to the MFCE, operation panel, FPD, DTMF receiver, and
optional paper feed units
•
Parallel interface to the motors, clutches, sensors, and other electrical
components
4. Analog circuit with HIC (Hybrid IC)
•
2-4 wire switching
•
Filters and amplifiers
•
Monitor speaker driver
5. DTMF Receiver
•
DTMF signal detection for Transfer Request using DTMF and Fax On
Demand operations
•
Serial interface to the EXIO
6. DC/DC Converters
•
+5V, +12.4V, +12V, and -9V generation
7. DRAM Backup
•
+5VD generation for DRAM (SAF memory) backup
8. Interlock Switches
•
The top/front cover interlock switch disables the power supply to the
drive components, the laser diode, and the power pack.
•
The fusing exit cover interlock switch disables the laser diode power
only.
9. Fuse and Test Points
Item
Description
F1
250V/5A fuse for the +24VD power supply
TP1
-9V
TP3
COM1 ground
TP2
+5VE
TP4
+5VLD from both interlock switches
TP5
+24VD from the top/front cover interlock switch
TP6
Laser synchronization signal
TP7
+24V input from the PSU
Detai
led De-
scr
ip
ti
ons
December 21st, 1995
DETAILED SECTION DESCRIPTIONS
PCBs
2-73