Receiver Uhf Synthesizer - Nokia 2125 Troubleshooting Manual

2125/2125i/2126/2126i/2128i (RH-71)
RF Description and Troubleshooting
Table 10 shows the values and description for the VCTCXO test points in
Test
Point
1
2
3
4
5
6
7

Receiver UHF Synthesizer

The UHF LO frequency varies with the channel. Use the following steps to troubleshoot
the UHF synthesizer using Phoenix.
1. Open the RF menu, and click Frequency Calculator.
Page 36
Table 10: VCTCXO Test Point Values and Descriptions
Description
CLK19M2_UPP to UPP
CLK19M2_GPS to GPS module
VR3: 2.8 V
AFC voltage: DC between 1 and 3 V:
• 1.3 V for PDM 0
• 0.8 V for PDM -1024
• 2.5 V for PDM 1023
Oscillator in to UHF PLL
F_REF_RX to N7100
F_REF_TX to N7000
©2005 Nokia Corporation
Company Confidential
Figure 27.
ISSUE 1 08/2005