Wcdma Rssi Measurement; Transmitter Troubleshooting; Introduction To Transmitter (Tx) Troubleshooting; Gsm Transmitter Troubleshooting - Nokia 3555 Service Manual

WCDMA RSSI measurement

Prerequisites
WCDMA RX must be activated before RSSI can be measured. For instructions, please refer to
activation for manual measurement (page
Steps
1. From the Phoenix testing menu, select WCDMA→RX Power measurement
2. In the RX Power measurement window, select:
• Mode: RSSI
• Continuous mode
3. Click Start to perform the measurement.
Note: WCDMA RSSI measurement is accurate only with WCDMA modulated signal.

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 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.

GSM transmitter troubleshooting

Prerequisites
Always start troubleshooting the lowest band, e.g. GSM850.
Steps
1. Set the phone to local mode.
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RF troubleshooting
WCDMA Rx chain
Issue 1