Transmitter Troubleshooting; General Instructions For Transmitter (Tx) Troubleshooting; Gsm Transmitter Troubleshooting - Nokia 5130 Service Manual
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Transmitter troubleshooting
General instructions for transmitter (TX) troubleshooting
Please note the following before performing transmitter tests:
• TX troubleshooting requires TX operation.
• Do not transmit on frequencies that are in use!
• The transmitter can be controlled in local mode for diagnostic purposes.
• The most useful Phoenix tool for GSM transmitter testing is "RF Controls".
• Remember that re-tuning is not a fix! Phones are tuned correctly in production
Note:
Never activate the GSM 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 power amplifier may be damaged.
GSM transmitter troubleshooting
Steps
1. Set the phone to local mode.
2. Activate RF controls in Phoenix (Testing→GSM→Rf Controls ).
Make settings as shown in the picture:
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RM-495; RM-496
RF troubleshooting
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