Introduction To Bb Troubleshooting - Nokia 301 Service Manual

RM-839; RM-840; RM-841
BB Troubleshooting and Manual Tuning Guide

Introduction to BB troubleshooting

The following sections contain guidelines how to identify and correct basic baseband related faults. Access
to normal LAB equipment (power-supply, digital multi-meter and oscilloscope) is a prerequisite for following
the guidelines. Due to the small size of the components and test-points, access to a microscope or magnifying
glass is recommended.
Initial baseband troubleshooting normally involves the measurements of various power supply voltages and
control signals. The location on the most important test-points is indicated in the following figure:
Issue 1 NOKIA INTERNAL USE ONLY Page 3 – 5
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