Read Sharp ER-A490 (serv.man2) Service Manual online
3) Pin description
Pin
No.
Symbol
Signal
name
In/
Out
Function
1
RES
RESET
I/O
Reset input
2
NMi
NMi
In
Non-maskable interrupt input
for SSP interrupt input.
for SSP interrupt input.
3
VSS
NU
In
GND
4
D0
Nu
In
GND
5
D1
Nu
In
GND
6
D2
Nu
In
GND
7
D3
Nu
In
GND
8
D4
Nu
In
GND
9
D5
Nu
In
GND
10
D6
Nu
In
GND
11
D7
Nu
In
GND
12
D8
D0
I/O
Data bus
13
D9
D1
I/O
Data bus
14
D10
D2
I/O
Data bus
15
D11
D3
I/O
Data bus
16
D12
D4
I/O
Data bus
17
D13
D5
I/O
Data bus
18
D14
D6
I/O
Data bus
19
D15
D7
I/O
Data bus
20
VSS
NU
In
GND
21
A0
A0
Out
Address bus
22
A1
A1
Out
Address bus
23
A2
A2
Out
Address bus
24
A3
A3
Out
Address bus
25
A4
A4
Out
Address bus
26
A5
A5
Out
Address bus
27
A6
A6
Out
Address bus
28
A7
A7
Out
Address bus
29
A8
A8
Out
Address bus
30
A9
A9
Out
Address bus
31
A10
A10
Out
Address bus
32
A11
A11
Out
Address bus
33
A12
A12
Out
Address bus
34
A13
A13
Out
Address bus
35
A14
A14
Out
Address bus
36
A15
A15
Out
Address bus
37
VSS
NU
In
GND
38
A16
A16
Out
Address bus
39
A17
A17
Out
Address bus
40
A18
A18
Out
Address bus
41
A19
A19
Out
Address bus
42
A20
A20
Out
Address bus
43
A21
A21
Out
Address bus
44
A22
A22
Out
Address bus
45
A23
A23
Out
Address bus
46
VSS
NU
In
GND
47
P30
WAIT
In
Wait signal
48
P31
BACK
Out
Bus control request
acknowledge
acknowledge
49
P32
BREQ
In
Bus control request
50
P33
DOPS
In
Drawer open signal
51
P34
DR0
Out
Drawer open signal
52
P35
DR1
Out
Remote drawer open signal
53
P36
DR3
Out
Remote drawer No.3 open
signal (NU)
signal (NU)
54
P37
DR4
Out
Remote drawer No.4 open
signal (NU): GND
signal (NU): GND
55
VCC
VCC
In
+5V
56
P40
NU
Out
NU
57
P41
PTMG
In
Printer timing signal
Pin
No.
Symbol
Signal
name
In/
Out
Function
58
P42
NU
Out
NU
59
P43
NU
Out
NU
60
P44
PRST
In
Printer reset signal
61
P45
NEJ
In
Near end sensor journal side
62
P46
SHEN
In
CKDC Interface shift enable
signal
signal
63
P47
OPBS
Out
Option ROM/RAM PWB sens
signal
signal
64
VSS
VSS
In
GND
65
P50
TRGI
Out
NC
66
P51
NU
Out
NC
67
P52
NU
Out
NC
68
P53
NU
In
GND
69
P54
NU
Out
NC
70
P55
NU
In
GND
71
P56
NU
Out
NC
72
P57/STOP
STOP
Out
System reset output. Normally
73
P60
NU
Out
NC
74
P61
J1
In
Thermal head rank: J1
75
P62
J2
In
Thermal head rank: J2
76
P63
NU
In
NC
77
P64
NU
Out
NC
78
P65
NU
Out
NC
79
P66/RCO
RCO
In
+5V
80
P67
NU
In
GND
81
VSS
NU
In
GND
82
AVSS
NU
In
GND
83
AN0
Vrf
In
84
AN1
NU
In
GND
85
AN2
VPTEST
In
+24V test input
86
AN3
TM
In
87
AVCC
AVCC
In
+5V
88
VCC
VCC
In
+5V
89
IRQ0
IRQ0
In
Interrupt signal 0
90
IRQ1
IRQ1
In
Interrupt signal 1 (RS-232C)
91
SCK1
UASCK
In
I/R control signal (Shift clock)
92
SCK2
SCK1
In
CKDC Interface sync shift
clock
clock
93
RXD1
/UARX
In
I/R control signal
(Receive data)
(Receive data)
94
TXD1
/UATX
Out
I/R control signal
(Transmit data)
(Transmit data)
95
RXD2
RXD2
In
CKDC Interface shift input
data
data
96
TXD2
TXD2
Out
CKDC Interface shift output
data
data
97
VSS
NU
In
GND
98
EXTAL
EXTAL
In
Crystal oscillator connection
99
XTAL
XTAL
In
Crystal oscillator connection
100
VSS
NU
In
GND
101
PHAI
PHA1
Out
System clock
102
E
NU
Out
NC
103
AS
AS
Out
Address strobe
104
RD
RD
Out
Read
105
HWR
WR
Out
Write
106
LWR
LWR
Out
Nu
107
RFSH
RFSH
Out
Refresh cycle
108
VCC
VCC
In
+5V
109
MD0
MD0
In
+5V (MODE 3)
110
MD1
MD1
In
+5V (MODE 3)
111
MD2
MD2
In
GND (MODE 3)
112
STBY
STBY
In
+5V (Nu)
12
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