2.4.2. FDU
1. Power Saver CPU
•
4 bit CPU for controlling the machine during power saver mode.
2. FPD (Facsimile Power Driver)
•
Stepper motor driver.
3. EXIO (External I/O)
•
Serial interface to the FCE and OPU.
•
Parallel interface to the main motor, clutches, and sensors.
4. HIC (Hybrid IC)
•
2-4 wire switching
•
Filters and amplifiers
•
Monitor speaker driver
5. DC/DC Converters
•
+5V generation
•
+12V generation
FCE
Power Saver
CPU
MFPD
External IO
HIC
M
M
Paper Feed Motor
TX Motor
Control
Serial I/F
+24V Interlock Sw.
+5V Interlock Sw.
DC/DC
Converter
+24V
+24VM
ON/OFF
+24VD
DC/DC
Converter
+12VP
+5VE
+5V
+5VV
ON/OFF
TB1
+5V
Flash ROM
Boot Block
Overwrite
ON/OFF
PSU
Fusing
Lamp
+5V
+5VLD
AC Input
Serial I/F
M
TX DATA
RX DATA
TX/RX DATA
NCU
CL
SOL
Sensors
OPU
Serial I/F
Main Motor
Clutches
Solenoids
Printer
I/F
Video I/F
h521d631.wmf
May 22nd, 1995
DETAILED SECTION DESCRIPTIONS
PCBs
2-73