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Fax Machine
KX-FT21BX
Service manual
Panasonic KX-FT21BX Service Manual page 140
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
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KX-FT21LA
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
160
STB2
161
STB3
-
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
PULL DOWN
3.3V
NO
MULT3/5
NO
MULT3/5
NO
MULT3/5
- 114 -
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
Pow er 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
Pow er 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
Pow er 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
I
Pull dow n
STB1
O Thermal head strobe 1
STB2
O Thermal head strobe 2
OPEN
O Not used
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Chapters
Table of Contents
28
Troubleshooting Guide
47
Disassembly Instructions
120
Circuit Operations
134
Table of Contents
Troubleshooting
troubleshooting guide
47
Troubleshooting Summary
48
Troubleshooting Details
51
Table of troubleshooting items
52
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Kx-ft21bx-w
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