8
Digital Control Troubleshooting
INTRODUCTION
Use this procedure only if you have followed the procedures in the
Troubleshooting
chapter,
and believe the problem to be in the digital control group. This procedure is designed to let
you identify the bad assembly within the digital control group in the shortest possible time.
Whenever an assembly is replaced in this procedure, refer to the
Table of Related Service
Procedures
in the
Post-Repair Procedures
chapter in this manual.
Figure 8-1 shows the digital control group in simplied block diagram form. The following
assemblies make up the digital control group:
A1 CPU
A30 Front Keyboard
A32 I-BASIC Interface
A33 EXT I/O Interface
A51 GSP
A52 LCD (Liquid Crystal Display)
A53 FDD
Digital Control Troubleshooting 8-1
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