User Guide

6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)

Troubleshooting - RF Nokia Customer Care

2. If all DC voltages are present, check the AGC control voltages. (See Figure 13 on

page 19).

• If the voltages are incorrect, check the SMDs around the TX_AGC1 and

TX_AGC2 lines.

• If SMDs are all good, replace the UPP.

3. Using an oscilloscope, look at the input modulation waveforms on R603, R604,

R605, and R606. They should all be present with an AC swing of about 500 mVpp

and a +1.2 V offset.

• If one or more waveforms are missing, look for SMD problems around these

resistors.

• If the SMD is good, replace the UEM.

4. Probe the Cell TX output of Jupiter using AAS-10 type RF probe.

5. Use the spectrum analyzer to probe the RF center frequency (see the "AMPS TX

Setup", "Cell TX Setup", or "PCS TX Setup" section for the correct spectrum

analyzer settings).

• If there is no RF or low RF, look for faulty SMD around the Jupiter chip.

• If the SMD is good, replace the Jupiter chip.

6. Probe the PA input. If level is low, look for an SMD issue on the TX filter. Reflow

or replace the filter as necessary.

7. Probe the PA output. If the RF is missing or low, look for Vbatt voltages and SMD

issues on and around the PA. If these voltages are good, replace the PA.

8. Probe the duplexer output. If the RF is missing or low, reflow or replace the

duplexer.

9. Probe the coupler output. If the RF is missing or low, reflow or replace the

coupler.

10. Probe the diplexer output. If the RF is missing or low, reflow or replace the

diplexer.

Failed Test: TX PA Detector

1. Use Phoenix to set the phone in Local Mode, and activate the TX with default

output power. The output power at the RF test connector should read

9 dBm +/- 4 dB.

2. Use a voltmeter on DC, and probe the detector output at C813. The voltmeter

should read approximately 1.4 V. If not, replace the detector (N803).

See Figure 13 on page 19 for test point location and common power and voltage

variations.