Specifications

8. OVERALL MACHINE CONTROL
The above diagram shows the control system of this copier in block form. The
CPU (IC123) on the main board controls the timing of all copier’s operation
based on the CPU’s internal clock. The CPU monitors the input signals from
all sensors and controls the dc components directly or through two I/O chips
(IC 105 and IC 124). It also controls ac components such as the fusing lamp,
exposure lamp, main motor quenching lamp, and exhaust blower motor (High
speed) directly via the ac drive board. The exhaust blower motor (Low speed)
is controlled via the I/O chip (IC 124) and ac drive board. The charge corona,
grid voltage and development bias are powered by the same power pack
(P1) but are controlled separately as shown above. The main board has a
RAM board for the service program mode and misfeed recovery. A battery
backs up the power to the RAM board.
Anti-condensation Heater
-Drum
-Optics
AC Power (115V or 220/240V)
Main Board
Cover Safety Switch
Main Switch
Main Motor
Quenching Lamp
Exhaust Blower Motor (H)
Exhaust Blower Motor (L)
Fusing Lamp
Exposure Lamp
Operation
Panel Board
Fusing Lamp
Drive Circuit
Main Motor Relay
AC Drive Board
Power Packs
Power Relay
TC/SC P.P.
Serial
Exposure Lamp
Drive Circuit
ARDF
Duplex
Serial
Sorter
Sensors/Switches/Thermistor
Image Density Sensor
Registration Sensor
Cassette Lift Sensor
Exit Sensor
Auto ID Sensor
Scanner HP Sensor
Lens HP Sensor
4th/5th Mirror HP Sensor
Toner Overflow Sensor
Toner End Sensor
Color Switch
1st/2nd/3rd Paper Size Switches
1st/2nd/3rd Paper End Sensors
Right Cover Switch
Manual Feed Table Switch
Solenoids/Clutches
Pick-up Roller Release Sol.
Cassette Lift CL Sol.
1st/2nd/3rd Paper Feed CL Sol.
Relay Roller CL Sol.
Registration Clutch
Upper/Lower Tray Lock Sol.
Development Drive CL Sol.
Toner Supply CL Sol.
Motors
Scanner Motor
Lens Motor
4th/5th Mirror
Optics Cooling Fan Motor
RAM
Board
CC/Grid/Bias P.P.
Charge Corona
Grid Voltage
Dev. Bias
Counters
Total Counter
Key Counter
Interface
IC 123
CPU
IC 124
I/O
IC 105
I/O
Board
IC 111
ROM
Fusing Thermistor
Platen Cover Closed Switch
Platen Cover/DF Position
Sensors
Original Width Sensor
Original Length Sensor
Relay Sensor
1 December 1990
11-16