Read Sharp XE-A301 (serv.man3) Service Manual online
XE-A301V
HARDWARE DESCRIPTION
– 6 –
3. PRINTER CONTROL
3-1. STEPPING MOTOR CONTROL
The stepping motor is driven at a constant voltage by Sanken
STA471A.
STA471A.
1step: 0.125mm, 1dot: 1step
Printing speed 50mm/s
< CPU’s PORT >
< Driving steps >
RECEIPT MOTOR
* When the motor is at rest, the same phase as the final excitation
phase is RUSH energize for 10 ms to turn off all phases.
3
Turn all
RAS ~ RDS and JAS ~ JDS into L.
No energizing should be allowed at lease 30 ms after stopping the
motor before restarting.
When starting the motor, the first excitation phase is RUSH ener-
gized for 10 ms to start the motor.
3-2. HEAD CONTROL
HEAD:832 dots in all. Printable range: 384 dots at receipt side; 384 dots
at journal side
Related PORT
* When turning on or off the printer power supply, make sure to turn /
STB1, 2, 3, 4 to “H”.
* Do not turn on without paper.
* THERMAL HEAD power supply control : Turns ON when P81= “H”;
turns OFF when “L”. (The power supply for HEAD and STEPPING
MOTOR is shared). When printing is finished (when the motor is
stopped) Athe power should be turned OFF.
* Before printing or feeding paper, perform A/D conversion in
**
ms
after the printer head is turned ON and make sure the voltage is sta-
ble.
(The power supply of the printer head should be turned ON and OFF
by using the regulator IC.)
by using the regulator IC.)
No.
CPU PORT
Signal to be used
80
P10
RAS
79
P11
RBS
78
P12
RCS
77
P13
RDS
76
P14
JAS
75
P15
JBS
74
P16
JCS
73
P17
JDS
Driver IC input (CPU output)
Motor driving signal
STEP
RAS
RBS
RCS
RDS
/RPFA
/RPFB
/RPFC
/RPFD
1
H
L
L
H
L
H
H
L
2
L
H
L
H
H
L
H
L
3
L
H
H
L
H
L
L
H
4
H
L
H
L
L
H
L
H
Driver IC input (CPU output)
Motor driving signal
STEP
JAS
JBS
JCS
JDS
/JPFA
/JPFB
/JPFC
/JPFD
1
L
H
H
L
H
L
L
H
2
L
H
L
H
H
L
H
L
3
H
L
L
H
L
H
H
L
4
H
L
H
L
L
H
L
H
No.
CPU PORT
Signal to be used
30
TXD2
SO
29
RXD2
SI
28
CLK2
PCLK
93
P103
/STRB1
92
P104
/STRB2
91
P105
/STRB3
90
P106
/STRB4
89
P107
LATCH
21
P81
VHCOM
/STB1: 641 ~ 832dot: 192 dots in all
Total 832 dots
/STB2: 449 ~ 640dot: 192 dots in all
/STB3: 193 ~ 448dot: 256 dots in all
/STB4:
1 ~ 192dot: 192 dots in all
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