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UI Module Troubleshooting PAMS Technical Documentation
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• U801 FMR
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Diagnostic Tests:
• Check the stereo headset has proper contact with the UI module since the ste-
reo headset is used as antenna to FM signal
• Check Music Player function. This will ensure the MCU, DSP, NAND, and
Audio Codec are functioning.
• Check presence of VBAT, and FM_VCC (Figure 47, “MCU Clock Waveform –
32.768kHz,” on page 74).
• Check operating current during recording mode (Table 7, “UI module volt-
ages,” on page 73).
• Connect Stereo headset and check signal line ST_DET @ U301-Pin20
(Table 8, “UI current consumption in normal conditons,” on page 73)
• Check the presence of 75kHz @ U801-Pin27 (Figure 49, “FMR Clock Wave-
form – 75kHz,” on page 76).
• Tune the FM to 87.5MHz and 108MHz using the Manual Tuning Menu. Check
the voltage at C815 and the reading should be 0.9V and 2V respectively.
• Check the 3-wire bus FM_WREN (U801-Pin31), FMR_DATA (U801-Pin30)
and FMR_CLK (U801-Pin29) lines using oscilloscope. Check for activities
when tuning is in progress.
• Check for analog audio activities @ C808 and C809 using oscilloscope. This
check will verify that the modulated “live” FM signal is successfully demodu-
lated by U801.
• Check the Audio Routing Select, U602-Pin10 and U602-Pin9 are routed cor-
rected (Table 10, “Audio routing select,” on page 73).
• Check for analog activities @ U601-Pin19 and U601-Pin20 using oscilloscope.
This check will verify that the FM music is successfully routed to the Codec.
• Check for analog activities @ U601-Pin9 and U601-Pin10 using oscilloscope.
This check will verify that the FM music has successfully by-pass the Codec.
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• U301 MCU
• U101 DSP
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