Rf Troubleshooting; Introduction - Nokia NHL-2NA Series Troubleshooting Instructions

CCS Technical Documentation

RF Troubleshooting

Introduction

Measurements should be done using Spectrum Analyzer with high-frequency 1kW (20:1)
passive probe (LO-/reference frequencies and RF-power levels) and Oscilloscope with a
10:1 probe (DC-voltages and low frequency signals).
Please note that the grounding of the PA-module is directly below PA-module so it is dif-
ficult to check or change. Most RF semiconductors are static discharge sensitive! So
ESD protection must be taken during repair (ground straps and ESD soldering irons). The
Hagar IC is moisture sensitive so parts must be pre-baked prior to soldering.
Apart from key-components described in this document here are a lot of discrete compo-
nents (resistors, inductors and capacitors) which troubleshooting is done by checking if
soldering of the component is done properly, for factory repairs (checking if it is missing
from PCB). Capacitors can be checked for shortening and resistors for value by means of
an ohmmeter, but be aware in-circuit measurements should be evaluated carefully.
Please be aware that all measured voltages or RF levels in this document are rough
figures. Especially RF levels varies due to different measuring equipment or different
grounding of the used probe.
All tuning must be done with Phoenix Service Software, version 02.90.001, or later.
Issue 1 07/02 ¤Nokia Corporation
NHL-2NA
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