Read Sharp XE-A303 (serv.man4) Service Manual online
XE-A303 (V)
HARDWARE DESCRIPTION
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7-5. DETECTION OF PAPER EMPTY
< CPU PORT >
For detection of paper empty, signal sampling is made for every 1 dot
line. If “Low” is detected for more than twice continuously, it is judged as
paper empty.
paper empty.
When paper empty is detected, printing operation is terminated. When,
however, paper empty is judged during printing operation, printing of
max. 15 dot liens (30 steps of the motor) can be made from the time of
max. 15 dot liens (30 steps of the motor) can be made from the time of
paper empty detection.
7-6. PLATEN OPEN
< CPU PORT >
To check the signals, signal sampling is made in the frequency of 1ms
or less. If open (Low) is detected twice continuously, it is judged as the
platen open status.
*
Since conduction to the head with the platen open may shorten the
life of the thermal head, printing operation is terminated when the
platen open is detected.
*
Under the platen open state (switch open state), it is inhibited to drive
the paper feed motor.
the paper feed motor.
8. A/D CONVERSION
The follwing four signals are inputted to the A/D conversion port.
< CPU PORT >
8-1. 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.
The printer head conduction must For the conductionbe controlled as
head, refer to the M-T203/205 specifications.
8-2. PRITER HEAD VOLTAGE MONITOR
To read the A/D conversion value, set the VPON signal (CPU P106) to
“H” and wait until the voltage is stabilized (after 20msec), and read the
value.
value.
The printable voltage range for the printer is 20.4V~26.4V, 684~886 in
A/D conversion value (A/D is 10 bit).
9. POWER
10. POFF PROCESS
The CPU shifts the service interruption mode within 10ms after POFF
interruption.
interruption.
PIN No.
PORT
SIGNAL NAME
FUNCTION
28
P77
PES1
PRINTER DETECTION OF
PAPER EMPTY
PAPER EMPTY
29
P76
PES0
PRINTER DETECTION OF
PAPER EMPTY
PAPER EMPTY
PIN No.
PORT
SIGNAL NAME
FUNCTION
30
P75
HUS1
HEAD UP SENSOR
31
P74
HUS0
HEAD UP SENSOR
PIN No.
PORT
SIGNAl NAME
FUNCTION
124
AN3/P103
VPTEST1
PRINTER HEAD VHJ
VOLTAGE MONITOR
VOLTAGE MONITOR
125
AN2/P102
VPTEST0
PRINTER HEAD VHR
VOLTAGE MONITOR
VOLTAGE MONITOR
127
AN1/P101
HTEMP1
PRINTER HEAD J SIDE
TEMPERATURE MONITOR
TEMPERATURE MONITOR
128
AN0/P100
HTEMP0
PRINTER HEAD R SIDE
TEMPERATURE MONITOR
TEMPERATURE MONITOR
HEAD
TEMPERATURE
A/D CONVERSION
VALUE (DEC)
OPERATION
Less than -10°C
929~1023
MOTOR LOCK
-10°C to less
than 0°C
than 0°C
869~928
Print in the conduction time
at 0°C.
at 0°C.
0°C to less
than 70°C
than 70°C
232~868
Print in the conduction time
specified on the M-T203/205
specifications.
specified on the M-T203/205
specifications.
70°C or above
0~231
MOTOR LOCK
Measures should be taken to restore within 15ms after a
POFF# occurs.
POFF# occurs.
24V
VDD 5.0V
VCC 5.0V
Battery
VLED 5.7V
BA033
POFF# detection point
24V
ON/OFF CONTROL
(MODE SW)
(MODE SW)
VCC3 3.3V
TRANS.
LM2574
+ Tr
+ Tr
PQ1CG2032
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