Epson FX 1170 Service Manual - Page 71

Paper Feed Motor Drive Circuit, MOTOR, ASSEMBLY, PF, UPA1476H

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. REV.-A 2.3.5 Paper Feed Motor Drive Circuit .,%. , The PF motor (a stepping motor) is used to advance the paper. The minimum advance rate is 1/216 inch. Th{e: motor is a 2-2 phase, constant voltage drive motor. CPU ports (P70 to P73) are used to control the PF motor. Phase data for the PF motor are outputted through these ports. PFA to PF-B are turned on or off within the uPA1476H (lCl) depending on the phase data sent from the CPU. When there is an output at A19 of the CPU, a +35 V voltage is supplied to the PFCOM terminal of the PF motor. Otherwise, a +5 V voltage is supplied through D1 to hold the motor. CPU UPA1476H (lCl) P70 PFAIN B1 cl H P72 PF&N B2 C2 P71 PFBIN B3 C3 P73 w PF~lN B4 C4 -d- PFA PF-A PFB PF-B MOTOR ASSEMBLY, PF 1 : +' : I t 1 1 t111111111 L J r '3:V F R5 I D1 R49 4-ph, 48-p PM type pulse motor 35W)C *1OYO 61(2=3(2 (per phase) (at 25 "C) Q1 A u +5V Figure 2-28. Paper Feed Motor Drive Circuit ~""' . . . 2-28

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.
REV.-A
2.3.5 Paper Feed Motor Drive Circuit
{:
%
The PF motor (a stepping motor) is used to advance the paper. The minimum advance rate is 1/216 inch. The
.,,.
,
motor is a 2-2 phase, constant voltage drive motor. CPU ports
(P70
to
P73)
are used to control the PF motor.
Phase data for the PF motor are outputted through these ports.
PFA
to
PF-B
are turned on or off within the
uPA1476H
(lCl)
depending on the phase data sent from the CPU.
When there is an output at A19 of the CPU, a +35 V voltage is supplied to the PFCOM terminal of the PF motor.
Otherwise, a +5 V voltage is supplied through
D1
to hold the motor.
CPU
P70
UPA1476H
(lCl)
MOTOR
ASSEMBLY, PF
PFAIN
B1
cl
PFA
:
--------
‘ -
‘
- - -
‘-‘-;
1
t
P72
H
PF&N
B2
P71
w
PFBIN
B3
P73
PF~lN
B4
-d-
r
PF-A
:
1
t
C2
1
1
1
PFB
+
‘
1
C3
1
1
1
PF-B
:
1
C4
1
I
1
L---------------
---J
‘3:V
F
<PF MOTOR>
4-ph, 48-p PM type pulse motor
R5
35W)C
*1OYO
61(2=3(2
(per phase) (at
25
“C)
I
D1
R49
Q1
A
u
+5V
Figure 2-28. Paper Feed Motor Drive Circuit
~“”’
. .
.
2-28