Trace Table Usage; Intermittent Problem Diagnostic Approach - IBM 6360 Product Support Manual

SECTION 17. TRACE TABLE USAGE
The trace table can be used to analyze
the path of the steps taken in the
MDl. When in the loop mode, compar-
ison of the steps in each loop will
show any differences in the path
taken. For example:
Diskette MDI trace.
001-y 003-y 005-y OO.9-y 013-y 015-f
001-y 003-y 005-y 009-n 010-y 012-n
This trace shows step 009 was answered
differently. The supplementary infor-
mation at MDI step 009 might supply a
clue to the cause of the intermittent
problem. The supplementary information
displayed at MDI step 009 reads: trThe
purpose of this test is to check the
diskette drive's speed." Because this
step had failed, the diskette unit
should be checked for any problems
that might cause s
lo~
diskette rota-
tion (slipping drive belt, etc.).
Chapter 10. Intermittent Problem Diagnostic Approach 10-25