Gps Rf Test Points - Nokia 2125 Troubleshooting Manual

2125/2125i/2126/2126i/2128i (RH-71)
RF Description and Troubleshooting
Table 14 gives the description and values for the test points as shown in

GPS RF Test Points

Use the following steps for RF testing:
1. Open the Troubleshooting menu, and click GPS Control.
The GPS Control dialog box appears.
2. Select Simple Rx Actions in the Function area.
3. Select On in the Options area, and click Execute.
4. Inject a -50 dBm tone at 1575.52 MHz into the GPS connector (X6250) with a
signal generator or call box.
5. Measure the test points with either a voltmeter or an AAS-10B probe with a
spectrum analyzer set at a center frequency of 1575.25 MHz and a span of
500hh kHz. (All points are 1575.52 MHz, except for TCXO, which is at
16.368 MHz.)
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Table 14: GPS Test and DC Test Point Values
Test
Description
Point
1 VDD_IO_GPS
2 TCXO Vcc
3 LNA Vcc
4 LNA_Base
5 VRF_GPS
Figure 39: GPS Control dialog box
©2005 Nokia Corporation
Value (V)
1.8
2.8
1.5
0.8
2.8
Company Confidential
Figure 38.
ISSUE 1 08/2005