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HP 300

HP 300
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Troubleshooting
Procedures
System
Level
System level troubleshooting consists of finding
out
what
part
of a
computer
system is
not
working correctly. A system consists of
the
computer
and
its installed accessories,
the
interfaces,
the
peripherals,
and
the
power source
the
hardware
is
connected to. Each of these system
elements is subject
to
the
environment which includes, physical, electrical,
and
human
factors.
When
part
or
all
of
the
computer
system fails,
the
initial activity should
be
directed towards
finding
what
part
of
the
system has
the
problem.
One
of
the
best things
to
do first
is
to
talk
to
the
users
and
ask
them
to
give specific information on
what
they
and
the
system was doing
when
the
system,
or
part
of
it, failed. You may have
to
duplicate
their
activities in
order
to
make
the
failure occur.
If
the
failure
is
intermittent,
this
process may
take
some time.
Running
tests
on
the
system
can
also
be
helpful. A
test
is
nothing
more
than
a specific action
with
the
system
that
should result in a specific response. Simple
tests
are nothing more
than
typing
in siInple instructions on
the
keyboard
and
executing theIn. A
command
to
print
or
plot
specific
date
is
an example. Mass storage, graphics,
or
other
functions
can
be
checked in
the
same way. These
type
of
tests
are called Quick Checks.
After determining
what
part,
or
product,
of
the
system
is
failing,
the
next
step
is
to
find
out
what
part
of
the
product
is
causing
the
problem.
In
this
case,
it
is
assumed
that
the
computer
or
bus
expander
has
the
problem.
The
rest of
this
chapter
covers troubleshooting these products.
Computer
/Bus
Expander
Troubleshooting
Both
units
may
be
troubleshot
the
same, except for
the
boards
in
the
computer's
system
slots.
Each has
the
same power supply,
motherboard,
fans,
and
backplane system.
Three
levels of troubleshooting these
products
are explained. For each level different portions
of
these
products
Inust
be
operational. A
summary
of these levels
and
what
must
be
operational
is
shown in Table 5-1.
104
Troubleshooting
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