Transmitter Troubleshooting; Introduction To Transmitter (Tx) Troubleshooting; Gsm Transmitter Troubleshooting - Nokia RM-627 Service Manual

Transmitter troubleshooting

Introduction to 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 Control"; in WCDMA transmitter testing
the best tool is "TX Control".
• Remember that re-tuning is not a fix! Phones are tuned correctly in production.
• The RX path for GSM and WCDMA are using the same filters in some bands. Please refer to
reference (page 4–26 )
Note: Never activate the GSM or WCDMA transmitter without a proper antenna load. Always connect
a 50Ω load to the RF connector (antenna, RF-measurement equipment or at least a 2W 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. In Phoenix, select Testing → GSM → Rf Controls . The RF Controls window opens.
3. Make the following settings:
Page 4 – 14
for details.
Figure 23 Phoenix RF Controls window
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RM-627
RF troubleshooting
RF components
Issue 1