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12-4
UHF1 Troubleshooting Tables:
Troubleshooting Table for Board and IC Signals (UHF1)
12.4 Troubleshooting Table for Board and IC Signals (UHF1)
Table 12-4. Troubleshooting Table for Board and IC Signals (UHF1)
IC Designator
Pin
Pin Function
DC Voltage (V)
Comments (Condition)
U201(IF IC)
1
Osc1
3.9
44.645 MHz input
2
Osc2
3.3
4
VCC
4.7
9
Audio frequency
1.2
12
RSSI out
Approximately 1
At -47dBm (with conducted)
13
N–DET(BUSY)
Low
At busy
15
GND
0
16
RF input
1
45.1 MHz input
U701(PLL IC)
1
Reference OSC input
1.4
12.8 MHz input
4
VCC
3.3
6
GND
0
7
XF IN
2.2
8
F IN
2.2
12
Power save
High
13
GND
0
14
LD_out
High
If pll unlock is low
15
@P
2.4
16
@R
Low
U601
1
Mode (Mute con)
0
(Audio Amp.)
2
SVR
3.8
3
IN+
3.8
4
IN-
3.8
5
OUT-
3.8
6
VCC
7.5
This voltage depends on Battery
7
GND
0
8
OUT+
3.8
U103
1
IN+
1.6
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: ......