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HP 3000 Series Installation And Service Manual

HP 3000 Series
80 pages
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Maintenance
The
following
paragraphs
briefly
describe
each
test
in
the
self-
tes
t
program.
5-5.
Basic
Instruction
Set
Test
The
first
portion
of
the
self-test
program
is
a
basic
instruction
set
test.
Most
of
the
INP
microprocessor's
instructions
are
tested.
LED
7
is
lighted
before
the
start
of
the
test.
If
the
test
is
successful,
LED
7
is
extinguished
and
LED
6
is
lighted.
If
the
test
fails,
LED
7
remains
lighted.
5-6.
ROM
Test
The
second
portion
of
the
self-test
program
tests
a
calculated
checksum.
The
ROM
contains
a
"burned-in"
constant
that
is
used
in
the
calculation
of
the
current
ROM
checksum.
A
net
result
of
zero
should
result
when
the
old
and
new
checksums
are
compared.
This
is
the
only
test
conducted
on
the
ROM.
LED
indicator
6
is
lighted
at
the
start
of
this
test.
If
the
test
is
successful,
LED
indicators
5
and
6
are
lighted.
If
the
test
fails,
indicator
6
stays
lit.
5-7.
Timer
Interrupt
Test
The
third
portion
of
the
self-test
program
checks
to
determine
that
a
timer
interrupt
occurs.
This
test
includes
a
timing
routine
that
executes
in
12
milliseconds.
During
that
interval,
a
timer
interrupt
should
have
occurred.
This
test
does
not
check
the
accuracy
of
the
timer,
but
rather
it
verifies
that
the
inter-
rupt
has
actually
occurred.
At
the
start
of
the
test,
LEDs 5
and
6
are
lighted.
At
the
successful
completion
of
the
test,
LED
3
is
lighted
and
LEDs
5
and
6
are
turned
off.
If
the
test
fails,
LEDs 5
and
6
are
left
on.
5-8.
RAM
Test
The
fourth
portion
of
the
self-test
program
is
the
RAM
Test,
which
consists
of
two
routines.
In
the
first
routine,
each
memory
location
has
its
address
written
into
it
and
then
read
from
it,
starting
at
location
0001
and
progressing
to
3FFF.
The
second
routine
fills
memory
downward
with
the
complement
of
the
address
and
reads
it
upward.
LED
indicator
3
is
lighted
at
the
start
of
the
test.
If
the
test
is
successful,
LED
indicator
4
is
lighted
and
indicator
3
is
turned
off.
If
it
fails,
LED
indicator
3
stays
lit.
A
further
test
is
performed
on
the
memory
refresh
circuitry.
Every
2
milliseconds,
all
of
memory
must
be
read
from
and
written
to
by
the
hardware
to
prevent
data
loss.
If
the
refresh
circuitry
were
to
fail,
it
would
show
up
as
a
failure
in
a
read
from
memory
after
this
test
wrote
to
memory.
5-4

Table of Contents

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HP 3000 Series Specifications

General IconGeneral
BrandHP
Model3000 Series
CategoryDesktop
LanguageEnglish

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