User Guide

CC Technical Documentation Troubleshooting - RF (Part 2)

RM-11

Use PDM settings from the previous section. Here are the approximate power levels you

should expect for CELL BAND (Channel 384):

• C677 Output of Robin, Input to the Tomcat Driver

Probed power ≅ -3dBm (If not, then replace Robin)

• Pin 6 of Tomcat Driver is the output (Gain ≅ 14dB)

Probed power ≅ +11dBm (If not, then replace Tomcat)

• C80 Output of the TX Saw filter (Loss ≅ 1dB)

Probed power ≅ +10dBm (If not, then replace the filter)

• R801 Output of Cell PA (use 10dB pad on probe or just sniff part)

Probed power ≅ +21dBm (If not, then replace Cell PA)

• C811 IREF into Cell PA should be ≅ 2.7V (If not, then trace back to Robin and then

to BB)

TX AMPS Troubleshooting Using Phoenix

Use the following steps to troubleshoot the TX AMPS using Phoenix:

1. In Local Mode/Main Mode, select AMPS Band.

2. Use PDM controls to adjust the PA, RF AND IF AGC.

Figure 21: AMPS Control dialog box

3. Local Mode:

• PA Gain PDM = 229

•RF AGC PDM = -416

• IF AGC PDM = -137

With PDMs set to the above values:

• Phone TX Pout ≅ +26dBm

Current ≅ 998mA

Note: If you do not measure the correct TX power at the RF connector, then repeat Cell band

Local Mode troubleshooting to find where the failure occurs. AMPS and Cell band share the

same TX path.