Finisher Main Pwb - Olivetti DF-650 Service Manual

2-3 Operation of the PWBs
2-3-1

Finisher main PWB

Compact
Flash
The finisher main PWB (FMPWB) includes the CPU, EEPROM and, SRAM, ASIC and FLASH ROM. It controls each
device as well as the entire finisher according to the program in the EEPROM. The EEPROM contains the control program
that is executed by the SRAM. The ASIC is the extension I/O.
The machine and the finisher are controlled sequentially. The CPU of the finisher main PWB (FMPWB) controls the entire
finisher in line with communications with the machine. Though the finisher uses a different control PWB from the one for
the optional centerfold unit, operations are synchronized using the communication IC (UART).
Y104371-8
SRAM
(U8, U10)
Address/data bus
EEPROM
(U5)
CPU
(U1)
Crystal
oscillator
circuit
(X1)
Machine
Figure 2-3-1 Block diagram of the finisher main PWB
Service Manual
FLASH ROM
(U7)
XIO
(U6)
Electric parts drivers
Motor driver
Transistor array, etc.
Centerfold unit
main PWB*
CPU
Switches
and
sensors
Solenoids
and motors
*Option
3H3
2-3-1