Checking Validity Of Signals; Fmtx2.0 Troubleshooting Faults; Phoenix Pc Tool - Nokia RM-235 Service Manual

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 (RIN & LIN – pins 15 and 16 respectively) 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. Typical maximum swing of these tones will be ~636mV peak to peak. The maximum
swing may vary between Nokia handsets but for the FMTx 2.0 implementation, the swing should not be
greater than the aforementioned value.

FMTx2.0 troubleshooting faults

Possible faults
Expected fault reports relating to the FMTx 2.0 implementation may consist of one or more of the following;
1 No left audio.
2 No right audio.
3 No audio.
4 Can't start FMTx.
5 Can't locate FM transmission on an FM receiver or no FM transmission.
6 Distortion on audio.
7 Poor reception on FM receive.r
8 No RDS information.
Initial fault analysis
Where possible, attempt to reproduce and verify the reported fault. Intermittent problems are likely to be
due to bad connections or broken components/solder joints. Any faults relating to poor FM transmitter
performance or frequent failure to locate usable frequencies when performing a scan are likely to be due to
some kind of antenna issues.
In handsets that utilise an antenna solution in a removable cover it is likely that the connecting interface
pins are either damaged, dirty or that the cover fits poorly perhaps due to broken tabs/latching lugs. Poor
audio fault reports may also be due to the above antenna issues.

Phoenix PC tool

Setting Up Phoenix
Required equipment;
• A Deskey security dongle for Phoenix to run.
• The latest version of Phoenix that has the FMTx 2.0 GUI installed on a PC (version 2007.21.000.27897 or
greater).
• A jig suitable for the handset.
• A cable to connect the jig/handset to the PC. Run Phoenix and select the FMTx panel.
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RM-235
FMTx 2.0 troubleshooting
Issue 1