10.1
Chapter
10
Reference
Information
Introduction
This chapter contains Portable PLUS reference information
and
additional service information:
• 10.2 Diagnostic test results.
• 10.3 Descriptions of diagnostic tests.
• 10.4 Service references.
• 10.5 Service equipment.
10.2
Diagnostic Test Results
Use the information in table 10-1 to interpret the results of built-in
and
disc-based diagnostic tests.
Table 10-1. Diagnostic Test Results
This
table
is
a re
peat
of
table
8-
2.
Messages sent by the built-in tests are translated into the
local
language of the computer. Disc-based
messages are in English.
For assembly-level repair, replace the assembly indicated in the
"assembly-level" column (or take the
steps listed).
For component-level repair, replace the component indicated in the
"component-level" column (or
take the steps listed). However, replacing the IC may not solve the problem; there might be other
problems, such as a short
on
the PC board or a
bad
passive component. When directed, use the
osciIIoscope routines indicated in the last column
to
help locate the fault,
and
refer to the wave-
forms
on
the schematic diagrams.
Test Result
Failure Codes:
116-118
127-129
Assembly-Level
Replacement
Replace individual
ROM
IC
s:
116-118
....
AIUI6
127-129
....
AIU27
If
not fixed, replace
memory PCA.
*t
Component·Level
Replacement
Replace individual
ROM
ICs:
116-118
....
AIU16
127-129
....
AIU27
If
latch or transceiver
suspected, trace using
scope routine.*t
Oscilloscope
Routines
Internal ROM read
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