Motorola VRS750, Service Manual

Page: 79 / 104

67
Troubleshooting Charts
8
Introduction to this
Section
This section contains detailed troubleshooting flowcharts. These
charts should be used as a guide in determining problem areas. They
are not a substitute for knowledge of circuit operation and astute
troubleshooting techniques. It is advisable to refer to the related circuit
descriptions in the “Hardware Detailed Theory of Operation,”
Chapter 6.
List of
Troubleshooting
Charts
Chart
Number Description
Page
Number
1 VRS Enable Failure 68
2 Error 12/10 69
3 Error 12/81 69
4 Error 12/82, Codeplug Checksum Error* 69
5 Error 12/84, Configuration Register Corruption* 69
6 Error 12/88, HC11 RAM Failure 69
7 VRS 001, VRS Synthesizer Lock Failure 70
8 Single Tone Encode Failure 71
9 Single Tone Failure 72
10 Base-to-Portable Repeat Failure 73
11 Portable-to-Base Repeat Failure 74
12 VRS ICM Audio Failure 75
13 Serial Bus Failure 76
14 Portable Audio at Local Speaker Issue 77
15 Programming/Tuning Failure 78
*Older VRS-EP versions may show a 12/82 Error flashing every 5 seconds for
Codeplug Checksum Error, and a 12/82 Error at power-up only for
Configuration Register Corruption.