REV.-A
5.1
An
Introduction
to
Troubleshooting
Troubleshooting
is usually
to
easy; vaned
symptoms
appear
depending
on
points
of
failure.
This
section
describes
two
procedures
which
may
allow
easier
troubleshooting
and subsequent repair:
1.
Check-out
procedure
Objective:
To
guide
the
user
through
a
problem
isolation
process
when
symptoms
do
not
indi-
cate a specific
component
malfunction.
Fault
isolation
level: Repair
by
unit
replacement, repair can be
accomplished
with
a basic
know-
ledge
of
computer
hardware.
2.
Unit
repair
flowchart
Objective:
To
guide
the
user
through
a
component
level repair process.
Allow
a
component-level
repair
of
an
individual
faulty
unit.
Fault isolation level:
Component
level - Requires an advanced
knowledge
of
computer
hardwa-
re engineering, and electronics.
General
troubleshooting
procedure
• First, isolate and replace
the
faulty
unit
according
to
the
check-out
procedure
faulty
each
time
a
unit
is replaced,
to
make sure
the
new
unit
is
not
faulty.
This
process
will
prevent
confusion
with
a
problem
caused
by
poor
connector
contacts.
• Second, isolate and replace
the
faulty
component
in
the
unit
according
to
the
appro-
priate
unit
flowchart
or
the
trouble
table.
Step
1
Check-out
procedure
Repair
by
unit
replacement
)
Step 2
Unit
repair
flowchart
Repair
at
com-
ponent
level
Note
1)
All
checks indicated
on
the
flowchart
must
be made.
Should any
unit
or
component
be replaced
disregarding
any check,
the
newly
installed
one
might
be damaged.
Note
2)
Whenever
you are
lost
in
the
repair procedure, return
to
the
entry
and
restart
the
procedure.
Note
3)
When
no
exit is found,
during
a
diagnostic
procedure (e.g.,
the
test
process has resul-
ted in repeating a
diagnostic
loop), proceed
with
the
repair
according
to
the
trouble
ta-
ble.
5.2
Test
Program
A
test
program
is supplied stored in an E-PROM
with
carrier
which
can be installed in
the
com-
puter
ROM capsule. The
test
program
provides
tests
for
the
ten
functions
listed in Table 5.1.
It
al-
lows
either
one
of
the
following
two
execution
modes
• AUTO
Modo
In
this
mode,
the
program
automatically
performs
a six
test
cycle.
If
desired,
the
cycle
may
be
repeated up
to
99
times. The
number
of
cycles
may
be selected
after
loading
the
program.
This
mode
is suitable
for
an aging
test
after
repair
or
a
test
on a
problem
of
very
low
reproducibility.
5-1
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