8.1
Overview
Chapter
8
Troubleshooting
This chapter presents the procedures for checking
and
repairing the Portable PLUS at both the assem-
bly
and
the component levels.
• Troubleshooting procedures (section 8.2).
• Using oscilloscope routines (section 8.3).
• Burning an EPROM (section 8.4).
• Testing the recharger (section
85)
.
• Testing the SNALj3270 software drawer (section 8.
6).
Troubleshooting
is
often begun by the customer, using the built-in diagnostic tests described
in
the
owner's manual.
The troubleshooting procedures
you
will use are based upon additional, more extensive diagnostics.
These
service
disc-based diagnostic tests
and
the diagnostic module oscilloscope routines are explained
in table 8-1.
Table 8-1. Comparison
of
Diagnostic Tests
Diagnostic Test
Customer Tests:
Built-in tests
Additional Service Tests:
Service disc tests
Diagnostic module oscilloscope
routines
1
Strengths
Contained in ROM (requires
minimum functionality).
Tests most functions.
Contained in
EPROM (requires
minimum functionality).
Tests many functions.
I
Limitations
Doesn't test all functions.
Loaded from disc into
RAM
(requires much functionality).
Unit must be disassembled to
probe signal lines.
Doesn't test several functions.
Oscilloscope required: fail
mode information not
displayed.
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