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VHF Troubleshooting Tables:
Troubleshooting Table for Board and IC Signals (VHF)
9-5
(DTMF decoder)
2
IN-
1.6
3
GS
1.6
4
Vref
1.6
8
OSC1
1.6
3.579545 MHz input
10
VSS
0
11
TOE
3.3
17
STD
High
At DTMF detecting
18
EST
3.3
19
ST/GT
3.3
20
VDD
3.3
FL701(VCTCXO)
1
VCON
1.9
2
GND
0
3
OSC out
osc
Generate the 12.8 MHz
4
VCC
5
Q206(N/S SW)
E
GND
0
B
N/S SW
12.5 kHz: Low
C
Collector
12.5 kHz: High
25 kHz: Low
Q304
E
+5V
5
At RX Mode
B
To Q305 collector
Low
C
RX_B+
4.7
Q305
E
GND
0
At RX Mode
B
RX_EN
High
C
To Q304 base
Low
Q503
E
GND
0
At TX Mode
B
TX_EN1
High
C
To Q706 base
Low
Q407
E
+5V
5
At TX Mode
B
To Q408 collector
Low
C
TXVB
4.7
Q408
E
GND
0
At TX Mode
B
TX_EN2
High
C
To Q407
Low
Table 9-4. Troubleshooting Table for Board and IC Signals (VHF) (Continued)
IC Designator
Pin
Pin Function
DC Voltage (V)
Comments (Condition)
Summary of Contents for P100 Series
Page 1: ...P100 Series Portable Radios Detailed Service Manual ...
Page 2: ......
Page 8: ...iv Notes ...
Page 18: ...xiv List of Tables Notes ...
Page 22: ...xviii Summary of Printed Circuit Boards and Bands Available Notes ...
Page 30: ...Notes 2 4 Test Equipment Service Aids and Service Tools Service Aids ...
Page 54: ...7 4 UHF2 Schematic Diagrams Overlays and Parts Lists Speaker and Microphone Schematic Notes ...
Page 128: ...7 78 Circuit Board Schematic Diagram and Parts List UHF2 435 480 MHz Notes ...
Page 150: ...7 100 Circuit Board Schematic Diagram and Parts List UHF2 MDC QCII R TTE 435 470 MHz Notes ...
Page 166: ...10 4 VHF Schematic Diagrams Overlays and Parts Lists Speaker and Microphone Schematic Notes ...
Page 192: ...10 26 Circuit Board Schematic Diagram and Parts List VHF 136 174 MHz Notes ...
Page 218: ...10 52 Circuit Board Schematic Diagram and Parts List VHF 136 174 MHz Notes ...
Page 242: ...10 76 Circuit Board Schematic Diagram and Parts List VHF MDC QCII R TTE 136 174 MHz Notes ...
Page 258: ...13 4 UHF1 Schematic Diagrams Overlays and Parts Lists Speaker and Microphone Schematic Notes ...
Page 328: ...13 74 Circuit Board Schematic Diagram and Parts List UHF1 MDC QCII R TTE 403 447 MHz Notes ...
Page 332: ...A 4 Warranty Service Support and Replacement Parts Further Assistance From Motorola Notes ...
Page 335: ......