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KX-FT21RS
Serivce manual
Panasonic KX-FT21RS Serivce Manual page 103
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
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Pin
Pin Name
Buffer Power supply
93
TEST3
94
XOUT
95
XIN
96
VSS
97
3.3V
98
TEST4
99
XHSTWR/IOP41
100
XOPRBE/MUX/OP53
101
XRAS/IOP42
102
XCAS1/IOP43
103
XCAS2/IOP44
104
DB3
105
DB2
106
DB4
107
DB1
108
DB5
109
DB0
110
DB6
111
DB7
112
XROMCS
113
XRD
114
3.3V
115
XWR
116
ADR0
117
ADR1
118
ADR2
119
VSS
120
ADR3
121
ADR4
122
ADR5
123
ADR6
124
ADR7
125
ADR8
126
ADR9
127
ADR10
128
VSS
129
3.3V
130
ADR11
131
ADR12
132
RBA0
133
RBA1
134
RBA2
135
RBA3
136
RBA4
137
RBA5/OP
138
RBA6/IOP
139
XRESCS1/OP72
140
XRESCS2/OP71
141
XMDMCS/OP
142
VSS
143
XRESCS3/OP52
144
20KOSC/IOP56
145
ADR13
146
ADR14
147
3.3V
148
ADR15
149
RM0/IOP00
150
RM1/IOP01
151
RM2/IOP02
152
RM3/IOP03
153
RXE/IP04
154
TM0/IOP10
155
TM1/IOP11
156
TM2/IOP12
157
TM3/IOP13
158
TXE/IP14
159
STB1
5V Tolerant
3.3V
NO
3.3V
-
3.3V
NO
3.3V
NO
3.3V
YES
3.3V
-
3.3V
NO
3.3V
NO
3.3V
NO
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
NO
3.3V
-
3.3V
-
3.3V
-
3.3V
-
3.3V
YES
3.3V
-
3.3V
-
3.3V
-
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
3.3V
YES
MULT3/5
NO
Signal Name
I/O
+3.3V
Test pin. fixed High
XOUT
24MHz oscillator
XIN
24MHz oscillator
DG
Ground
+3.3V
Power supply
+3.3V
Test pin. fixed High
RLY
O Tel line relay control
SP-MUTE
Speaker mute control
OPEN
O Not used
OPEN
O Not used
OPEN
O Not used
D3
Data bus
2
Data bus
4
Data bus
1
Data bus
5
Data bus
0
Data bus
6
Data bus
D7
Data bus
XROMCS
ROM chip select
/RD
Read signal output
+3.3V
Power supply
/WR
Write signal output
A0
Address bus
1
Address bus
2
Address bus
DG
Ground
3
Address bus
4
Address bus
5
Address bus
6
Address bus
7
Address bus
8
Address bus
9
Address bus
10
Address bus
DG
Ground
+3.3V
Power supply
11
Address bus
12
Address bus
A13
Bank address
14
Bank address
15
Bank address
16
Bank address
17
Bank address
18
Not used
19
O Not used
OPEN
Not used
OPEN
Not used
OPEN
Not used
DG
Ground
OPEN
Not used
OPEN
O Not used
OPEN
Not used
OPEN
Not used
+3.3V
Power supply
OPEN
Not used
T5
O Motor control
T4
O Motor control
T3
O Motor control
T2
O Motor control
T0
O Motor control
LEDON
O CIS LED control
OPEN
O Not used
OPEN
O Not used
OPEN
O Not used
PULL DOWN
I
Pull down
STB1
O Thermal head strobe 1
103
KX-FT21RS
Description
Table of
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Table of Contents
Troubleshooting
TROUBLESHOOTING GUIDE
18
TROUBLESHOOTING DETAILS
21
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