Receiver Uhf Synthesizer - Nokia 2125 Troubleshooting Manual

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Table of Contents

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

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

Company Confidential

Figure

27.

ISSUE 1 08/2005

Table of Contents

2125i 2126 2126i 2128i Rh-71