User Guide
PAMS Technical Documentation
9. Troubleshooting
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Transceiver Troubleshooting ......................................................................................... 5
Baseband Troubleshooting ..........................................................................................5
General testing information....................................................................................... 5
Troubleshooting ........................................................................................................ 5
Phone does not start up normally or does not stay on............................................... 8
Flash Programming does not work.......................................................................... 10
Charging.................................................................................................................. 12
Audio failures.......................................................................................................... 13
Accessory detection................................................................................................. 15
Sleep Clock ............................................................................................................. 16
User Interface .......................................................................................................... 18
Receiver Troubleshooting ..........................................................................................22
General Instructions for RX troubleshooting.......................................................... 22
Path of the received signal ...................................................................................... 22
Fault-finding charts for receiver chain.................................................................... 23
Transmitter fault-finding ...........................................................................................30
General instructions for TX troubleshooting .......................................................... 30
Path of the transmitted signall................................................................................. 30
Fault-finding charts for transmitter ......................................................................... 30
Power control loop .................................................................................................. 33
Synthesizer fault-finding ...........................................................................................36
19.44 MHz reference oscillator............................................................................... 36
RX VHF VCO......................................................................................................... 38
TX VHF VCO......................................................................................................... 39
UHF Synthesizer ..................................................................................................... 39