Chapter 6 Basic Troubleshooting
6.1 Introduction
If the board does not pass all the performance checks in Chapter 3, then the circuit board should be
replaced. If repair requires knowledge of details of component level troubleshooting, please send
radio to a Motorola Service Center listed in Appendix A.
6.2 Replacement Back Cover Kit Procedures
Once a problem has been isolated to a specific board, install the appropriate service kit (See Model
Charts in Chapter 1), which is orderable.
If a board is replaced, it does not necessarily need to be retuned if it has been factory tuned. It
should however be checked for performance before being placed into service. Of particular concern
is the Bias DAC, which will need to be set for the appropriate final device bias current prior to keying
up the radio. If the bias is not properly set it may be possible to cause damage to the transmitter.
The Tuner Tool only allows the serial number of the blank board to be entered
once. Be very attentive during this procedure.
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