Epson LQ 1050 Technical Manual - Page 97

Paper Feed Motor Drive Circuit Block Diagram

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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 A (4B) ' c ' ?' GA(E05A ISHA) (3A) ?7 Do WA ffB -i Pfc ffD COMCD COMAB 1 r Figure 2-43. Paper Feed Motor Drive Circuit Block Diagram As you can see in 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. q Paper Feed Motor Specifications Type 4-phase 48-pole PM type stepper motor Voltage Driving: + 3 6 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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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