Receiver Rf Test Points - Nokia 2125 Troubleshooting Manual

2125/2125i/2126/2126i/2128i (RH-71)
RF Description and Troubleshooting
Table 5 includes the descriptions and values for Rx DC troubleshooting test points shown
in Figure 16.
Test
Description
Point
1 LO Vdd
2 RFA Vdd
3 C_LNA Vdd
4 P_LNA Vdd
5 IFA Vdd
6 IFA Vdd
7 RX LO lock voltage

Receiver RF Test Points

For the test points in
RF input. The signal was then traced throughout the receiver chains. An Agilent 8960 call
box is recommended. (Open Call Setup, press the Active Cell soft button, and then
select CW.)
Inject a continuous wave (CW) signal for PCS (1960MHz) or Cell/AMPS (881.52MHz) at a
fixed –25 dBm power level. Measurements were taken with the AAS-10 RF Probe. Signal
levels are approximate, and the accuracy may be +/- 2 dB or more depending on the
probe position and grounding.
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Table 5: Rx DC Test Points
Value
2.6 VDC LO Amp Vdd supply lines for Cell and PCS
2.8 VDC RF Amp Vdd supply line for Cell band
2.8 VDC External Vdd supply line for Cell LNA
2.8 VDC External Vdd supply line for PCS LNA
2.8 VDC IF Amp Vdd supply line for CDMA and AMPS IFs
2.8 VDC IF Amp Vdd supply line for CDMA and AMPS IFs
1.2 to 1.7 VDC
Figure 17, an external signal source of –25 dBm was injected to the
©2005 Nokia Corporation
Company Confidential ISSUE 1 08/2005