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Troubleshooting
This
section
provides the information necessary to
troubleshoot
a
faulty
instrument
to
the
Field
Replaceable
Unit (FRU)
level.
In
most cases an FRU is a circuit
board. The primary means
for
troubleshooting
is
to cross-reference
the
error index
code
output
from the Extended (Ext)
Tests
Diagnostics and
to
the suspect circuit
boards, using the FRU
Guide tables below.
In
addition, other
troubleshooting
techniques are described at the end of this section to
llelp
identify a faulty CRT.
CRT
Termination, Distnbuted
Capacitance Plate,
Power
Supply Assembly, or
Regulator
board.
After the faulty FRU
is
replaced,
some recalibration of the
instrument is normally required.
Diagnostics Overview
Diagnostics are composed of two levels. The first
is
the Kernel Diagnostics that
verifies
the
main processor and its associated hardware such as ROM, RAMs and
control signals.
After
all the Kernel Diagnostics have
passed
without failure,
the
second-level
Self-Test Diagnostics run.
The
Self-Test
Diagnostics
verify the
remainder
of
the
instrument circuitry. A
Self-Test fault causes
the
instrument to enter
Ext
Test Diagnostics. The
Ext
Tests
Diagnostics are a superset of the instrument's Self-Tests. These diagnostics
allow
selective, interactive
testing.
Other
Troubleshooting,
at
the
end
of
this section, lists the circuits
that
Diagnostics
do not fully test.
Level 0: Kernel Diagnostics
The
processor cannot execute code correctly with Kernel errors present. The
Kernel
Diagnostic
output
is
used as a troubleshooting tool
when
repairing kernel
faults. Once
the
kernel
is functioning, the Self-Test Diagnostics and
Ext
Tests
Diagnostics
test
the
remainder
of the instrument.
Level 1: Self-Test Diagnostics
3-80
The Self-Test
Diagnostics
consist of power-up diagnostic software routines that
verify instrument
functionality.
The Self-Test
Diagnostics
are invoked
automatically at power-up, manually with
a
front-panel menu, or
externally
through
the RS-232-C and GPIB ports. Once invoked, these routines run
automatically
without
operator
intervention. IT a test failure occurs, then the instrument
ceases
testing. Refer
to
RS-232-C/GPIB for external interface information.
Maintenance-11302A Service Reference
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Table of Contents
Troubleshooting
