Appendix A: RF Troubleshooting
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2005 Nokia. All rights reserved
A-99
“Receiver troubleshooting”.
•
Connect an RF-generator to the WCDMA-antenna connector
•
Set RF-generator frequency to 2141.0 MHz (unmodulated signal)
•
Measurements can be done with a spectrum analyser and an RF probe. Remember to make correct
frequency settings to the spectrum analyser (Centre frequency should be set to the same
frequency as the RF-generator). RBW = VBW = 10 kHz, Span = 0, sweep time = 100 ms.
•
Connect the probe to the T7500 input. The RF level should be roughly -80…-85 dBm in the input
pad when input signal level in WCDMA antenna connector is -50 dBm.
4.2.1.1.1 Replace filter Z7502
4.2.1.2 Replace balun T7500
4.2.2 Hinku WCDMA LNA output ok?
•
WCDMA receiver has to be active before measurements. Procedure is explained in section
“Receiver troubleshooting”.
•
Connect an RF-generator to the WCDMA-antenna connector
•
Set RF-generator frequency to 2141.0 MHz (unmodulated signal)
•
Measurements can be done with a spectrum analyser and an RF probe. Remember to make correct
frequency settings to the spectrum analyser (Centre frequency should be set to the same
frequency as the RF-generator). RBW = VBW = 10 kHz, Span = 0, sweep time = 100 ms.
•
Connect the probe to the Z7501 input. The RF level should be roughly -65…-70 dBm in both input
pads when input signal level in WCDMA antenna connector is -50 dBm.
4.2.2.1 Replace Hinku N7500
4.2.3 WCDMA SAW Z7501 in place and working correctly?
•
WCDMA receiver has to be active before measurements. Procedure is explained in section
“Receiver troubleshooting”.
•
Connect an RF-generator to the WCDMA-antenna connector
•
Set RF-generator frequency to 2141.0 MHz (unmodulated signal)
•
Measurements can be done with a spectrum analyser and an RF probe. Remember to make correct
frequency settings to the spectrum analyser (Centre frequency should be set to the same
frequency as the RF-generator). RBW = VBW = 10 kHz, Span = 0, sweep time = 100 ms.
•
Connect the probe to the Z7501 output. The RF level should be roughly -70…-75 dBm in both
output pads when input signal level in WCDMA antenna connector is -50 dBm.
4.2.3.1 Replace SAW Z7501
4.2.4 Are RX-IQ signal waveforms and levels correct?
