Advertisement
B.
OUTLINE OF ELECTRICAL CIRCUITS
The major electrical operations of the copier are controlled by the microprocessor on the
DC controiler PCB. This microprocessor is programmed to read input signals from the sensors
and control panel keys, and to send commands to drive loads (motors, solenoids, lamps, and
other devices) in response at the necessary times.
For reference:
The microprocessor used in this copier incorporates an A/D converter enabling it to read
analog signals as well as digital signals. Signals marked by (A) in Figure 3-2 are analog signals.
Main motor M1
is a synchronous type and runs at a speed determined by the AC line frequency,
Scanner drive motor M2 is a stepping type, and runs at'a frequency determined by a crystal
controlled oscillator in the DC controller. Any variation of the AC line frequency will affect only
the main motor; this could result in compressed or elongated images.
DC controller
Control panel
keys
Scanner at HOME position;
Lens at HOME position
Cassette paper sensor;
Delivery unit paper sensor
Pick-up unit paper sensor
(Photointerrupter)
Cassette size sensor;
Manuat feed tray position
SW
sensor
.
5 a
a
Switch
3
2
|
£ a
i
5
I
3
f
:
®
=
:
Fixing roller surface
temperature
sensor
Thermistor
®
AE sensor
Remaining toner {black}
La |
sensor
24V power supply fault seivor
Control panel LED
indicators
HVT
Lamp
regulator
Poor aniten
Noise filter
D2 be foeHO [oee
Circuit breaker
Main switch
Figure 3-2
Exhaust fan;
Scanner cooling fan;
Feeder suction fan
Registration roller clutch
Pick-up roller clutch
solenoid
Preconditioning exposure
lamp
Scanner motor
Primary/transfer
corona unit;
Developing cylinder
(ua) Scanning lamp
Fixing roller heater;
Main motor;
DF/ADF {aption);
Sorter (option)
Advertisement
