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Introduction
This troubleshooting guide has been prepared to help assist engineers' in the
process of repairing the DB2000 mobile phone. A comprehensive range of RF
readings, signals and voltage values have been recorded from key parts of the
DB2000's logic and RF circuits. These readings can then be utilised by the
engineer and used as a reference guide from which they can compare these
signals with one's taken from faulty or suspect boards.
Part 1 : Equipment configurations
The test equipment configurations for repair and testing are shown below.
Figure: 1.1 Repair bench configuration
Spectrum Analyzer
Oscilloscope
Power Supply
3.8vdc
GSM/PCN test set
DC Power Leads
Logic and TRX boards
Dummy
battery
(optional)
RF Test Cable
GSM/PCN
Test Jig
DB2000 Repair
Fixture
Data Test Cable
This configuration is only an illustration of the types of equipment required. The
requirement for a Spectrum Analyser will be dependent upon which GSM/PCN
Test Set is chosen.
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