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RM-721; RM-722
RF Troubleshooting
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 TX path for GSM and WCDMA are using the same filters in some bands. Please refer to
reference (page 4– 0
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.
Issue 1
)
for details.
Figure 17 Phoenix RF Controls window
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