Nokia NSB-7 Series Service Manual page 250

NSB-7
Disassembly & Troubleshooting
Table of Contents
Disassembly & Troubleshooting..............................................................................................1
Disassembly of NSB-7 ............................................................................................................................ 4
Transceiver Troubleshooting................................................................................................................. 8
Baseband Troubleshooting ................................................................................................................. 8
PCB Test Points................................................................................................................................... 8
Testing ...................................................................................................................................................22
Troubleshooting............................................................................................................................... 23
System Clock .................................................................................................................................... 24
Sleep Clock ....................................................................................................................................... 25
Power Supplies ................................................................................................................................ 26
Phone is totally dead ..................................................................................................................... 28
Flash programming fails ............................................................................................................... 28
Power doesn't stay on or phone is jammed ............................................................................ 29
Contact service on the phone display....................................................................................... 29
SIM related faults........................................................................................................................... 30
Audio faults ...................................................................................................................................... 31
Charging fault.................................................................................................................................. 32
RF testpoints ........................................................................................................................................33
RX ........................................................................................................................................................ 33
TX......................................................................................................................................................... 33
VCO ..................................................................................................................................................... 34
VCTCXO .............................................................................................................................................. 35
PICTURES FROM MEASUREMENT POINTS ............................................................................... 36
Receiver Fault Finding .......................................................................................................................41
General............................................................................................................................................... 41
Hagar.................................................................................................................................................. 41
AGC-block .......................................................................................................................................41
Controlling AGC with WinTesla ................................................................................................41
LNA ..................................................................................................................................................... 41
RX-filters ........................................................................................................................................... 41
Antenna Switch............................................................................................................................... 41
Transmitter fault finding ..................................................................................................................42
General............................................................................................................................................... 42
Antenna Switch............................................................................................................................... 42
PA-Module, Directional Coupler and Power Detector.......................................................... 42
HAGAR ............................................................................................................................................... 42
RF path ............................................................................................................................................42
Power control ................................................................................................................................42
Synthesizer fault finding ..................................................................................................................43
General............................................................................................................................................... 43
VCTCXO .............................................................................................................................................. 43
VCO ..................................................................................................................................................... 43
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