REV.-A
● Gate Array (IC3A: E05A15HA)
This gate array
(IC3A)
directly controls phase switching
rotational direction, under control of the CPU. Data for
expanded in the paper feed motor phase switching circuit,
to switch the rotational direction of the paper feed motor.
CPU
(4B)
PD3
I
PDO
CR
~D
@
for the paper feed motor to switch the
phase switching is sent from the CPU,
and output as the phase switching signal
GA[E05A15HA)
1
( 3A)
4
Paper Feed
Motor
Phase Switching
—
Circuit
G
Latch
~D
1
i
Mode
Reg.
-
Figure
2-44. GA (E05A15HA) Function for Paper Feed Motor
Paper Feed Motor Excitation System
The paper feed motor is controlled by the open-loop constant voltage drive circuit. The phases of
the paper feed motor are controlled by
PFA-PFD
of the gate array
(IC3A:
E05A15HA).
2-2 Phase excitation system is used.
The paper feed motor has one driving transistor per winding
(unipolar drive), two driver’s become
active in the 2-2 phase excitation system.
Figure 2-45 shows the 2-2 phase excitation system.
(
IC2A)
A02 ‘
N
OFF
C02
ON
OFF
B02
‘
N
OFF
002 ‘
N
OFF
Step
Rotation
Figure 2-45.
I
I
I
I
I
I
I
1
1234
C.c. w
~
C.w
Phase Excitation System
,:.
”-’
2-54
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