Download Canon NP-2120 Technical information

B. Electrical Circuitry
The copier is controlled by the two microprocessors
and communication LSI on the DC controller PCB,
each of which functions as follows:
1 Microprocessors 1
Q301 (master)
. Controls the copy sequence.
. Controls the document size identification.
Note:
The main motor (Mi) is a synchronous motor
thatusesthefrequencyofthepowersupplyas
referente. The scanner motor (M2) and lens
motor (M3), on the other hand, are stepping
motors that use the oscillation frequency of
the crystal oscillator built in the DC controller.
As such, luctuations in the power supply frequency during copy operation in turn fluctuate
the main motor (MI), causing the copies to
carry expanded or contracted images.
Q302 (slave)
. Controls the stepping motor.
. Outputs the image formation control signals.
Q304 (IPC)
. Controls the serial communication with ADF
and sorter.
Note:
With the built-in A/D converter, the copie&
microprocessors can read both digital and
analog signals.
3-2
COPYAIGHT 0 1992 C A N O N I N C .
C A N O N NPZl20/2MO RN.0 M A Y 1990 PAINTEO I N J A P A N IIMPAIME AU JAPONI