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Timing
Chart
P60
J
P61
' '
'
I
'
'
'
i
I
!
'
Carriage
Motor
Signals
P62
1:.____
;-------'
P63
IC104
@
Gate
Array
(for
example)
Output
Signals
(25
bits)
at
cover
up
correction
(25
bits all)
'
'
1
L
(
(
t'
(
~
~
-
-
32
-
10.2.6
Carriage
Motor Drive
Circuit
The Carriage motor is
a
four-phase uni-polar PM type stepping motor. The motor drive
circuit
receives its
signals from P60-63
of
the CPU. These signals are L levels
and are
fed to the driver (IC106)
which
is a
M54532
.
This
driver contains 4
NPN Darlington transistors with clamp diodes. When the CPU sends
the
signals for
the Motor to
step,
the transistors
are
turned on
in
a given
sequence.
Once the motor has finished stepping,
all
the transistors are turned off and no current flows to the motor
,
because
P60-63 of the CPU become
L
levels
.
Circuit
Diagram
CPU
25
14
P60
~---1-----1
P61
26
11
10
9
27
3
I
P62
I
7
1 :
P63
28
6
I
I
102
51
0
Carriage Motor
._
____
IC106
I
I
L-----J
Timing
Chart
P60
I
I
I
I
I
I
P61
J
I
L
I
I
P62
J
L
'
I
I
I
P63
I
I
I
-33-
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