Overall Machine Control - Ricoh FT4430 Service Manual

16 April '88

OVERALL MACHINE CONTROL

The base copier has two CPUs on the main board that control all machine
operations (the main CPU and the optics CPU).
The main CPU is the main controller of this copier. It monitors the input
signals from sensors and controls the electrical devices through program
mable 1/0 devices. The main board has a RAM (2 kilobytes) for the service
program function. A battery backs up the power to this RAM. This CPU con
trols the fusing lamp, via the heater control board, the exposure lamp, via the
lamp regulator, and motors directly from the main board.
The optics CPU controls the servomotor (15 volts) and the stepper motors
(24 volts) for the optics section.
The interface board is connected to the copier main board when the
document feeder and/or sorter are installed.
1-20