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Chapter
4
Status Display Board Diagnosis
Introduction
This chapter contains information pertaining to the diagnosis of problems using the 09895-
66506 Status Display Board.
General Description of Diagnosis Method
The 9895 Controller contains 2 kbytes of code dedicated to a self-exercise of the drive
system to verify its correct operation. The self-exercise is designed to halt at any failure.
Fortunately, status of the self-test can be monitored as 15 bits of data. Ten bits indicate
which test and subtest are being performed, and the other five contain miscellaneous infor-
mation such as format being used (see Table 4-1 for complete list of bit functions). When a
halt occurs, the ten bits may be read as an error code, and the problem narrowed down to a
smaller area. The next few sections detail how to initiate the self-exercise, how to use the
Status Display Board to obtain the error code and how to translate the error code into a
specific problem area.
Figure 4-1. Self· Test Functions
4-1
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