Read Sharp ER-A410 / ER-A420 (serv.man3) Service Manual online
ER-A410/ER-A420
HARDWARE DESCRIPTION
– 14 –
12. PRINT RATIO LIMITATION
Max. 288dot/1line x 140line (Corresponds to black background LOGO
print.)
Ave. 108dot/1line or less (Corresponds to 12.5% of all dots.)
13. BUZZER
A buzzer of piezo type is used.
The oscillation frequency is 4.0kHz
m
0.5kHz.
14. RESET
The RESET signal is generated under the following condition.
1) When the MODE KEY SWITCH is moved from SRV’ to another
position (except for OFF).
15. POFF
The POFF signal is changed from 0 to 1 when the 5V system power
and the 24V system power reach the operating voltage. When they fall
and the 24V system power reach the operating voltage. When they fall
below the operating voltage, the signal is changed from 1 to 0.
POFF, RESET TIMING CHART
16. I/O
<LED Segment Signal> Write
<Serial I/O ch2 receive signal> Read
<LCD Write Data> Write
<Key Return Signal, Key Exchange Signal> Read
<LCD Read Data> Read
<LCD Control Signal/Key Strobe Signal> Write
<Key Return Signal> Read
<LCD Control Signal/Key Strobe Signal> Write
<EFT Data> Write/Read
<EFT Status> Read
+5V
+24V
/RESET
/POFF
/EFTRES
20.8V
POWER ON
Instant service
interruption
interruption
MODE
SRV'
SRV'
MODE
Other than
SRV'
Other than
SRV'
POWER OFF
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
04000h
dp
g
f
e
d
c
B
a
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
04000h
X
X
X
X
/CD2
/DR2
/CS2
/CI2
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
04001h
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
04001h
X
X
X
X
KR11 KR10
KR9
KR8
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
04002h
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
04003h
X
E
R/W
RS
KS3
KS2
KS1
KS0
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
04003h
KR7
KR6
KR5
KR4
KR3
KR2
KR1
KR0
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
04003h
X
E
R/W
RS
KS3
KS2
KS1
KS0
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
0400Eh
D7
D6
D5
D4
D3
D2
D1
D0
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
0400Fh
X
X
X
X
X
CLM
IBF
OBF
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