PCBS
21 May, 1999
2-44
SRAM
•
128 KB SRAM for system and user parameter storage, backed up by the
battery on the FCU
Modem (Rockwell R288F)
•
V.21, V.27ter, V.29, V.17, V.33 (Ricoh mode only), and V.34 modems
Energy Saver CPU
•
4-bit CPU for controlling the machine during energy saver mode.
I/O Driver
•
Power pack and main motor control
•
Parallel to serial conversion of motor control signals
•
Parallel to serial conversion of JBIG data (only in the USA model)
JBIG LSI
•
JBIG Compression LSI (installed only in the USA model)
Oscillators
•
OSC1: 32.768 KHz oscillator for the real time clock. The battery on the FCU
backs this up
•
OSC2: 29.952 MHz oscillator for system, scanner and printer clock
generation
•
OSC3: 28.224 MHz oscillator for the R288F modem clock
•
OSC4: 16 MHz oscillator for the I/O Driver and JBIG LSI clock
•
OSC5: 8.00 MHz oscillator for the Energy Saver CPU clock
EXIO (Expand I/O)
•
Serial interface to the operation panel and optional paper feed units
•
Parallel interface to the motors, clutches, sensors, and other electrical
components
Switch
Item
Description
SW1
Switches the backup battery on/off
Analog circuit with HIC (AFE - Analog Front End)
•
2-4 wire switching
•
Filters and amplifiers
•
Monitor speaker driver
