Sharp XE-A301 Service Manual page 10

5-3. KEYSCAN MATRIX
CPU STO
MODE P90 SRV
Others P91 PF-R
5-4. DISPLAY
This machine has an LCD display, 5 x 7 dots, 2 lines, at the front side
and a 7-digit LED at the pop-up side.
FRONT:
POP UP:
• Display DIGIT signal
The above ST0 ~ ST6 are display digit signals.
ST0: 1st digit ~ ST6: 7th digit
• Display SEGMENT signal
The LED segment signal is outputted by writing SEGMENT data in
the /CS3 space.
Correspondence of DATA ~ SEGMENT
D0 ~ D6 3 A ~ g
D7 3 DP
6. POWER SUPPLY
Measures should be taken to restore within 10 ms after a
power failure occurs..
TRANS.
/POFF detection
point
ST1 ST2
PGM
PF-J RPE
24V
LM2574 +
ON/OFF CONTROL
(MODE SW)
PQ1CG2032
VLED
VCC 5.0V
BATTERY
XE-A301V HARDWARE DESCRIPTION
ST3 ST4
Time REG
HEAD JPE
UP
7. REWRITING FLASH MEMORY
IPL from EP-ROM: After IPL SW is set to ONA the program is started
8. DRAWER
This machine has a 1 channel of drawer port. (+ 1 channel is reserved
for the CPU PORT) O R No open sensor is provided.
The driving time for the DRAWER solenoid are as follows: 50ms (max)
45ms (min)
9. PRINT RATE
384 dots/1 line
10. A/D CONVERSION
The printer power supply voltage should be measured at more than 10
ms after the printer is turned ON.
11. BUZZER
PIEZO type BUZZER
The oscillating frequency is 4.0kHz m 0.5kHz
12. RESET
The RESET signal is generated when:
1) The mode key switch is turned from SRV to a position other than
SRV'(excluding OFF).
VDD 5.0
2) The power is turned ON more than 10 seconds after the power is
turned OFF. (The reset signal may not be issued if the POWER-
OFF time is short.)
3) The mode key switch is turned from OFF to a position other than
OF (excluding the SRV position). (If the power-off time is less than 5
seconds, the reset signal may not be issued.)
– 9 –
ST5 ST6 ST7
MGR X1/Z1 X2/Z2
DRAWER MRS
OPEN
from EP-ROM by turning on the power.
The program on EP-ROM is transferred to flash
ROM by switching the banks through S-RAM.
ST8 ST9
RS/CI