NPM-5
Troubleshooting PAMS Technical Documentation
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General instructions for Synthesizer troubleshooting ................................................46
26 MHz reference oscillator ( VCTCXO ) ................................................................46
Measuring on the VCTCXO component................................................................. 46
Measuring on the VCTCXO buffer......................................................................... 47
VCO ...........................................................................................................................47
14. Troubleshooting chart for PLL Synthesizer ........................................................48
14.1 Dead phone troubleshooting............................................................................ 49
Frequency lists ...........................................................................................................50
Hagar and serial interface ............................................................................................ 63
UI Module Troubleshooting ..............................................................................66
Troubleshooting method .............................................................................................. 66
Display Module .........................................................................................................67
LCD/Keyboard Backlight ..........................................................................................67
LCD Backlight ........................................................................................................ 67
Keyboard Backlight................................................................................................. 67
Keyboard/Hotkeys Functions ....................................................................................67
Music Player Function ...............................................................................................68
Line-In Recording Function ......................................................................................68
FMR Function ............................................................................................................69
FMR Recording Function ..........................................................................................70
Phone Audio Routing Function .................................................................................71
USB Connectivity Function .......................................................................................72
Appendix A: UI Module Voltages And Current Consumption ................................... 73
Appendix B: Signals on oscilloscope screen ............................................................... 74
Appendix C: Troubleshooting flow charts................................................................... 78
15. General UI troubleshooting .................................................................................78
16. Display module malfunction ................................................................................79
17. No backlight in LCD or keyboard .......................................................................80
18. Keyboard or hot keys do not respond ..................................................................81
19. No audio in Music Player ....................................................................................82
20. No FM audio or manual FM tuning malfunction ................................................83
21. FM recording not possible ...................................................................................84
22. Stereo audio malfunction .....................................................................................85
23. Stereo headset microphone malfunction ..............................................................86
24. Mono headset malfunction ..................................................................................86
25. Phone speaker malfunction ..................................................................................87
26. Phone microphone malfunction ...........................................................................88
27. USB detection malfunction ..................................................................................89
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Fig 1 Topside Components..................................................................................................8
Fig 2 Bottom Side Components...........................................................................................8
Fig 3 Power test points.........................................................................................................10
Fig 4 CPU test points...........................................................................................................11
Fig 5 Flash programming.....................................................................................................11
Fig 6 .Dead phone................................................................................................................12
Fig 7 Flash programming troubleshooting...........................................................................14
Fig 8 Flash programming troubleshooting 2........................................................................15
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