Sharp XE-A301, Руководство по обслуживанию

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XE-A301V HARDWARE DESCRIPTION
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3. PRINTER CONTROL
3-1. STEPPING MOTOR CONTROL
The stepping motor is driven at a constant voltage by Sanken
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.)
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