Gsm Transmitter Troubleshooting - Nokia 6120 classic Service Manual

RM-243
RF troubleshooting
Note: Never activate the GSM or WCDMA transmitter without a proper antenna load. Always connect
a 50 Ω load to the RF connector (antenna, RF-measurement equipment or at least a 2 W dummy
load); otherwise the GSM or WCDMA Power amplifier (PA) may be damaged.

GSM transmitter troubleshooting

Steps
1. Set the phone to local mode.
2. Activate RF controls in Phoenix (Testing→GSM→Rf Controls ).
Use the following settings:
3. Check the basic TX parameters (i.e. power, phase error, modulation and switching spectrum), using a
communication analyser (for example CMU200).
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