MAINTENANCE PHILOSOPHY
down (1A power switch with
PWR OFF
lamp lighted and
OFF
a major or minor alarm. It is assumed that the user
can locate the frame which was automatically powered
NORM
lamp off) due to the power fault. The user can
follow the aisle pilot lights or read the
REPT:PA
The precise structure of the message is given in the
GENERAL
based upon the design of equipment (hardware),
trouble-clearing tasks. The degree to which these
procedures accomplish this depends upon input and
feedback from the user. Additions, corrections, and
Power problems are sensed by scan points which generate
TAP PHILOSOPHY
improvements to the data are encouraged. Manufacturer,
The maintenance philosophy contained in this volume is
Procedures are intended to aid personnel in performing
of frame are identified by that frame’s SD number. If not
In general, most logic circuit failures cause the fault
identified. Procedures unique to a particular modification
so identified, the procedure applies to all modifications.
recovery program to request a diagnostic program. This
method of requesting the diagnostic program includes
diagnostic software, and test equipment employed.
TASK INDEX LIST (IXL) PHILOSOPHY
access to those procedures pertinent to the symptoms
reflects this in the TTY printouts listed. Other than the
ANALY:TLPFILE
supplementary messages which include the
phrases
"
SUSPECTED FAULTY EQUIPMENT
"
or
"
NULL PACK TEST
pertain to problems in generating a suspected faulty
equipment list and refer to procedures (TAPs) which
attempt to correct the problem. If successful in
generating a suspected faulty equipment list, these
common trouble-clearing approach.
The Task Index List is structured to provide fast
When documenting a procedural approach to trouble-
with this list. If a suspected faulty equipment list is
not successfully generated, the TTY messages refer to
the next level of trouble-clearing, raw data analysis
clearing, certain assumptions are made. It is assumed
that one fault is being cleared at a time. When directing
the user to perform an action, it is assumed that the
user performs that action correctly. Similarly, when the
user is directed to make replacements, the replacement
the trouble-locating program (TLP) option. The IXL
GENERATED,
"
all
ANALY:TLPFILE
supplementary messages
procedures refer to the appropriate procedure [TAP-103,
TAP-102, or TAP-104] which tells the user what to do
[TAP-105], which is an alternative to the first and most
engineering and software documentation such as input/
output (I/O) manuals, SDs, PKs, PRs, etc., are referred
to where applicable rather than duplicating that
information in TOP. Some portions of those documents
may be utilized in procedures, but only as examples for
purposes of explanation. Test equipment (oscilloscopes,
voltmeters, etc.) and parameters involved in circuits
being tested, adjusted, or checked are usually prescribed.
unusual or unique in some manner.
I/O message manuals. Symptoms described in IXL reflect
the previous assumptions and indicate other conditions,
observable at the frame, that would enable the user to
access the proper trouble-clearing procedure. These
conditions are fuse blown, lighted LEDs on converters,
or lighted LEDs on power function circuit packs.
Setup and method of use is not described; unless, it is
printout which identifies the frame with power fault.
234-151-013
100
Issue 8
DEC 1995
TAD
PAGE 1 of 2
