Hinku Wcdma Lna Output Ok; Wcdma Saw Z7501 In Place And Working Correctly; Are Rx-Iq Signal Waveforms And Levels Correct - Nokia RM-42 Service Manual

Appendix A: RF Troubleshooting
"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?

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