Read Sharp XE-A113 (serv.man3) Service Manual online
XE-A113 (V)
HARDWARE DESCRIPTION
– 9 –
4. PRINTER CONTROL
4-1. STEPPING MOTOR CONTROL
The two-phase bi-polar stepping motor is driven at a constant voltage.
1step : 0.087mm, 1dot : 2step
1step : 0.087mm, 1dot : 2step
<CPU PORT>
<DRIVE STEP>
4-2. HEAD CONTROL
HEAD : All 288dot, Width 0.167mm/dot (6dot/mm)
<CPU PORT>
4-3. PAPER TAKE UP MOTOR CONTROL
<CPU PORT>
4-4. OUT OF PAPER DETECTION
<CPU PORT>
4-5. PLATEN OPEN (HEAD UP DETECTION)
<CPU PORT>
5. A/D CONVERSION
The following three signals are inputted to the A/D conversion port.
<CPU PORT>
5-1. PRINTER HEAD TEMPERATURE MONITOR
The voltage divided by the thermistor for detecting the printer head tem-
perature and the resistor is inputted to the AN0 pin.
perature and the resistor is inputted to the AN0 pin.
5-2. PRINTER HEAD VOLTAGE MONITOR
The voltage supplied by the printer head power and passed through the
printer and divided by the resistor is inputted to the AN1 pin.
The printable voltage range for the printer is 140~252 in A/D conversion
value.
value.
5-3. BATTERY VOLTAGE MONITOR
The voltage of VDD is inputted to AN3 pin. For an A/D value of 189
(3.69V) or less, it is judged as LOW BATTERY. For 174 (3.40V) or less,
it is judged as NO BATTERY.
6. KEY/DISPLAY
The front display is of 10 digits of LED, and the POPUP display is of 7
digits of LED.
digits of LED.
<KEY/DISPLAY COMPOSITION>
Pin No.
CPU port
Use signal
Function
76
P14
IN2
Paper feed motor (IN2)
75
P15
IN1
Paper feed motor (IN1)
74
P16
ENA2
Paper feed motor (ENA2)
73
P17
ENA1
Paper feed motor (ENA1)
Driver IC input (CPU output)
Motor drive signal
STEP
IN1
IN2
ENA1 ENA2
A
(OUT1)
B
(OUT3)
/A
(OUT2)
/B
(OUT4)
1
L
L
H
H
H
H
L
L
2
H
L
H
H
L
H
H
L
3
H
H
H
H
L
L
H
H
4
L
H
H
H
H
L
L
H
Pin No.
CPU port
Use signal
Function
89
P107
STRB1#
Printer STB1#
94
P102
STRB2#
Printer STB2#
30
P70
DAT
Printer print data
28
P72
PCLK
Printer forwarding clock
90
P106
LATCH#
Printer data latch
91
P105
VPON
Printer head motor power
Pin No.
Port
Use signal
Function
21
P81
MOTOR
Printer paper take up motor
Pin No.
Port
Strobe signal
Function
6
P91
/S4
Printer out of paper detection
(It reads according to the timing of /S4)
(It reads according to the timing of /S4)
Pin No.
Port
Strobe signal
Function
6
P91
/S3
Platen open detection
(It reads according to the timing of /S3)
(It reads according to the timing of /S3)
Pin
No.
No.
Port
Use
signal
Function
97
AN0/P100
TM
Printer head temperature monitor
95
AN1/P101
VPTEST Printer head voltage monitor
93
AN3/P103
VBAT
Battery voltage monitor
Head
temperature
A/D conversion
value (DEC)
Operation
Less than
−
10°C
929~1023
Motor lock
−
10°C ~
Less than 0°C
869~928
Print in the conduction time at 0°C.
0°C ~
Less than 70°C
Less than 70°C
232~868
Print in the conduction time speci-
fied on the MT-T53II specifications.
fied on the MT-T53II specifications.
70°C or above
0~231
Motor lock
FRONT:
POP UP:
ST0#
㨪
ST9#
HC138
KS0
㨪
KS3
Front Display
10 segment
POPUP Display
㧣 segment
Keyboard / MODE SW
MATRIX
ST0#
㨪
ST9#
HC374
D0
㨪D7
a
㨪g, dp
P90
㨪P97
CPU
/CS0 30000h
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