Fm Radio; How The Fm Radio Works; Fm Radio Test; Fm Radio Troubleshooting - Nokia 6235 Baseband Description And Troubleshooting

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FM Radio

How the FM Radio Works

D2800 turns on the FM radio and sets the frequency using CBUS serial interface as the
communication channel. A high frequency FM radio signal come in through RFIN1 Pin to
the FM radio chip, then it gets demodulated into a low frequency signal and send to
UEMEK for amplification. The amplify signal then get routed back to either universal
headset or to the system connector for stereo headset.
Figure 12: FM Radio (N356), Audio (N150), antenna, and digital interface connections

FM Radio Test

To hear the FM radio, you first connect headset to Pop-Part™ or UHJ ports because the
headset will be an FM radio antenna. And you have to connect headset to UHJ port to
control the FM radio by using Phoenix. But if you connect a headset (such as HDS-3) to
Pop-Part™ connector, then you can't control the phone because you've already occupied
the connection port (Pop-Part™), so in this case you have to have jumper wires on
production test points (Fbus Tx/RX,GND).

FM Radio Troubleshooting

When troubleshooting the FM radio, make these common checks (see
• Check Power Supply VIO and VANA
• Check SleepCLK
• Check FMANT
• Check for activity on CBUS
• Check output of FM radio on VAFR and VAFL
• If 6 is not correct, then Check FM radio chip for shorts, voids, and misalignments
Issue 1 04/2005
Figure 11: Camera Control in Phoenix
©2005 Nokia Corporation
6235/6235i/6236i (RM-60)
Baseband Description and Troubleshooting
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Figure 13):
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