Preparing For Synthesizer Troubleshooting - Nokia 6260 RM-25 Service Manual

Nokia Customer Care
Assumption
• No soldering or component failure for simple SMD components such as resistors, inductors and capacitors
• Failure in one particular operating GSM channel, whether Tx or Rx, in which the synthesizer is the cause of
the failure, causes failure in all other GSM channels in Tx/Rx.

Preparing for synthesizer troubleshooting

Steps
1. Place the phone (mechanics removed) on module jig.
2. Connect the module jig to the PC via a DAU-9P cable.
3. Connect the module jig to a power supply (4.2V).
4. Connect the RF output to a spectrum analyzer or another measurement instrument.
5. Use a 10dB attenuator at the input to spectrum analyzer to avoid damage.
6. Make sure the dongle is connected and start Phoenix.
7. In Phoenix, select File -> Open Product -> RM-25 (Nokia 6260) Product Menu.
8. Select Testing -> RF Controls.
9. In the toolbar: set Operating Mode -> Local.
10. Select Band -> GSM 1800.
11. Set Operation Mode -> Continuous.
12. Set Active Unit -> Rx.
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Figure 143 Synthesizer key components without shielding frames
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Company Confidential
RM-25
RF troubleshooting
9235618 (Issue 2)