REV.-A
2.3.5.3 Paper Feed Control Circuit
The paper feed mechanism of this printer is driven by the paper feed motor. The paper feed motor is
controlled by a gate array
(IC3A:
E05A1 5HA) and the CPU. Figure 2-43 shows the paper feed motor
drive circuit block diagram.
vu
+5V
(4B)
‘c’
?’
A
COMCD
GA(E05A
ISHA)
COMAB
As you can see in
(3A)
?
7
Do
WA
ffB
Pfc
ffD
-i
1
r
Figure 2-43. Paper Feed Motor Drive Circuit Block Diagram
Figure 2-43, the paper feed motor drive voltage is controlled by PC7 from the CPU,
and phase switching is performed by the gate array (I
C3A).
The paper feed motor rotates in both forward
and reverse directions. Since the paper feed motor rotates in the reverse direction only for micro
adjustment or sheet load/eject, the paper feed motor cannot be rotated in the reverse direction by any
control codes.
● Paper Feed Motor Specifications
Type
4-phase 48-pole PM type stepper motor
Voltage
Driving:
+36
VDC
Holding: +5 VDC
Coil Resistance
78Q &
3fl
at 25” per phase
Current
Driving: 1.2 A (max.)
Holding: 0.08
A(typical)
Excitation
2-2 phase
Paper Feed Pitch
0.118 mm/pulse (4.23 mm: 1/6”: 36 pulse)
2-53
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