User Guide

RM-11

Troubleshooting - RF (Part 2) CC Technical Documentation

Receiver DC Troubleshooting Layout

Figure 30: Receiver DC troubleshooting layout

Table 1 includes the measure logic levels for the Rx front end.

Note: If logic levels are significantly off (+/- 0.2V), replace Alfred (N750) and re-measure. If voltages

are still out-of-spec, consult Troubleshooting - Baseband section of this manual.

Table 1: Measure Logic Levels for Rx Front End (N750)

Logic Inputs Voltages

Modes Band (1) Gain_CTU (2) IF_SEU (3)

CELL CDMA HI-GAIN 0.1 V 2.75 V 0 V

CELL CDMA LOW-GAIN 0.1 V 0 V 0 V

PCS CDMA HI-GAIN 2.68 V 2.75 V 0 V

PCS CDMA LOW-GAIN 2.68 V 0 V 0 V

AMPS HI-GAIN 0.1 V 2.76 V 2.76 V

AMPS LOW-GAIN 0.1 V 0 V 2.76 V