Fmtx2.1 Si4713 Visual Inspection Troubleshooting; Checking Validity Of Signals - Nokia N900 Service Manual

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BB Troubleshooting

FMTx2.1 Si4713 visual inspection troubleshooting

Troubleshooting flow

Checking validity of signals

Please refer to Access to signals figure as a reference. Generally all power supply levels and clocks willbe
consistent. Signals on the analogue audio input pins (R6181 and R6182) will be dependant on the audio
content being injected to the device. During the audio self test (initiated from Phoenix) it is possible to
monitor these pins and check that the DSP generated 1KHz tones can be seen at some point during the test.
Check that the signals are clean and that no obvious distortion can be seen such as clipping of the signals.
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