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Chapter 12 UHF1 Troubleshooting Tables
12.1 Troubleshooting Table for Receiver (UHF1)
Table 12-1. Troubleshooting Table for Receiver (UHF1)
Symptom
Possible Causes
Procedure
Corrective Action
Radio Dead (no
turn–on beep, no
LED indication)
1. Battery dead or
defective
Substitute good battery or battery
eliminator
Change or replace battery.
2. Defective battery
contacts
Inspect battery contacts for
corrosion or bent terminals
Clean/Repair/Replace J602
3. Microprocessor not
starting up
Verify clock input to U101 Pin 13 is
7.3728 MHz using high impedance
probe.
Verify U101 Pin10(reset) is high.
Troubleshoot/Replace FL101.
If reset is Low, troubleshoot
regulator U506 or U107.
4. Regulator fault
Verify U506 Pin 4 is 3.3V
Verify U505 Pin 4 is 5.0V
Check for shorts on outputs
Troubleshoot/Repair as
needed, replace faulty regulator
5. Flexible Cable fault
Check connection of the 12 pin
flexible cable between J104 & J105
Re–assemble or replace flexible
cable
No RX Audio (with
LED indication)
1. Speaker dead or
defective
Substitute a good housing (with
speaker)
Verify J603 connection
Change the housing (with
accessory)
Change the housing (with
accessory)
2. Audio Processor IC
not starting up
Verify clock input U102 Pin 14 is
3.5795 MHz using high impedance
probe.
Troubleshoot/Replace FL102
3. Audio Amp IC not
starting up
Verify U601 Pin 6 is battery voltage.
If battery voltage is being supplied to
Pin 6, then verify audio output at
Pin 5 & 8.
Troubleshoot/Replace U601
No Receive (with
no LED indication)
1. IF IC dead or fault
Verify clock input to U201 Pin 1 & 2
is 44.645Mhz using high impedance
probe.
Troubleshoot/Replace FL201
No RX
1. RX–B+
Verify Q304’s collector voltage is
4.8V when RX–EN is high.
Check/Replace Q304
Содержание P100 Series
Страница 1: ...P100 Series Portable Radios Detailed Service Manual ...
Страница 2: ......
Страница 8: ...iv Notes ...
Страница 18: ...xiv List of Tables Notes ...
Страница 22: ...xviii Summary of Printed Circuit Boards and Bands Available Notes ...
Страница 30: ...Notes 2 4 Test Equipment Service Aids and Service Tools Service Aids ...
Страница 54: ...7 4 UHF2 Schematic Diagrams Overlays and Parts Lists Speaker and Microphone Schematic Notes ...
Страница 128: ...7 78 Circuit Board Schematic Diagram and Parts List UHF2 435 480 MHz Notes ...
Страница 150: ...7 100 Circuit Board Schematic Diagram and Parts List UHF2 MDC QCII R TTE 435 470 MHz Notes ...
Страница 166: ...10 4 VHF Schematic Diagrams Overlays and Parts Lists Speaker and Microphone Schematic Notes ...
Страница 192: ...10 26 Circuit Board Schematic Diagram and Parts List VHF 136 174 MHz Notes ...
Страница 218: ...10 52 Circuit Board Schematic Diagram and Parts List VHF 136 174 MHz Notes ...
Страница 242: ...10 76 Circuit Board Schematic Diagram and Parts List VHF MDC QCII R TTE 136 174 MHz Notes ...
Страница 258: ...13 4 UHF1 Schematic Diagrams Overlays and Parts Lists Speaker and Microphone Schematic Notes ...
Страница 261: ...Circuit Board Schematic Diagram and Parts List UHF1 403 447 MHz 13 7 Figure 13 5 Transmitter Schematic Diagram ...
Страница 328: ...13 74 Circuit Board Schematic Diagram and Parts List UHF1 MDC QCII R TTE 403 447 MHz Notes ...
Страница 332: ...A 4 Warranty Service Support and Replacement Parts Further Assistance From Motorola Notes ...
Страница 335: ......