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01-110
RULES FOR USING MAPS
You will usually be using MAPs or MAP diagnostic
integration (MOl) tests to diagnose a failure with
symptoms that remain constant. MAPs and MOl tests
used in this way should identify a failing
field-replaceable unit (FRU).
If the failure symptoms do not remain constant, you
should still use the MAPs and MOl tests when
attempting to isolate the problem. If the MAPs and MOl
tests fail to find the problem, perform the following:
• Reseat the cards and cables
• Use the error recording procedures (Section 80-000)
• Use the intermittent failure replacement list (MAP
5000)
When using a MAP or running an MOl test, the MAP or
MOl test always describes how to prepare the machine
or operate the switches needed to answer the MAP
questions or run the tests. Additional information
describing the purpose of the MAP or MOl test is also
given.
You should observe the following procedures when
using the System/34 MAPs or MOl tests:
1.
Always analyze any unusual noise or distinct errors
before going through the MAPs by using the table
of contents or index to find information that
pertains to the symptom, or, use the MAP for the
specific part of the machine that is failing. If you
cannot determine the cause of the failure from
these sources of information, start at the system
entry MAP for a detailed analysis of the symptom.
2.
3.
4.
For other system failures, or failures reported by
the customer, you should normally start at MAP
0101.
Always start using a device MAP or MOl test at
entry point A unless you are instructed not to, and
check to see that the START conditions are met.
Always power down before removing or installing
a fuse, cable, or card, unless you are instructed
not to.
5.
When a MAP indicates that a card or cable is bad,
do the following:
a. Inspect the card and socket, then reseat the
card and run the test that failed.
b. Remove the bad card or cable, install a good
one, and run the test that failed.
c. If the card has top card connectors, reverse the
connectors end for end and run the test that
failed to see if the symptom changes.
d. Swap cards in the system unit to see if the
symptom changes. Card swapping information
is in the Field Service Logics on page AC5OO.
e. Install new cards for each card in the LOGIC
CARDS TESTED list at the start of the MAP or
MOl test.
6.
Always probe all lines indicated, observing the
status of each line, before answering the question
that follows in the MAP or MOl test, unless you
are instructed to perform some other action.
7.
Names of all switches and indicators are shown in
MAPs in the same way that they· appear on the
panel itself.
8.
Hexadecimal numbers are shown as hex AB23 or
X'AB23'.
9.
An X inside single quotation marks indicates a
don't care position. For example, the second X in
X'X54B' could represent any hexadecimal number.
10.
After you diagnose and repair a problem, run the
failing MAP or MOl test again to verify that the
problem is corrected.
01-120
PROBING INFORMATION WHEN USING
MAPS
Use the General Logic Probe II tool, (IBM part 453212)
to measure signal levels when the MAPs instruct you to.
This probe is used instead of an oscilloscope for normal
System/34 maintenance. Detailed information on using
and maintaining the'probe is in the IBM General Logic
Probe
/I
Manual, SY27-0127, and in paragraphs 02-015
through 02-045 of this manual.
6
01-120
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