Wcdma Receiver Troubleshooting Flowchart; Transmitter Troubleshooting; General Instructions For Transmitter (Tx) Troubleshooting - Nokia RM-555 Service Manual

RM-555
RF Troubleshooting

WCDMA receiver troubleshooting flowchart

Troubleshooting flow

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", in WCDMA transmitter testing
the best tool is "TX Control".
• Remember that re-tuning is not a fix! Phones are tuned correctly in production.
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.
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