Filter
Top Products
Model
89048
Instrument Changes
7-6.
FIRMWARE
UPDATES (A2U12 AND A2U13)
The -ware
is
changed whenever anomalies are found
in
the
instrum
ent’s
operation which can
be
corrected by altering the Controller’s program. Firmware
is
also
changed
to
add new features, which
may
only
be
changes
in
the
program, or which may
also
result
from
instrument hardware changes.
Replacing the
ROMs
Use the following procedure
to
install
new
ROMs:
The
ROMs
(MU12 and MU131 are static sensitive devices. Takeprecau-
tions
against electrostatic discharge
@SD)
before handling these compo-
nents.
NOTE
In instruments with serial prefix 2942A and below, the finware is stored
in two
ROMs
(MU12 andA2U13). In instruments with serialprefix2948A
and above, the firmware
is
stored only in
one
ROM
(MU12).
(MU13 serves
a different
function)
1.
Unplug the power
cord.
2. Remove the top cover.
The
cover may
be
tightly secured
in
the groove of the bottom cover.
If
the top cover does not
pull
off
easily after backing out the screw on the rear edge, back out the
screw on the rear edge of the bottom cover also.
3.
For
instruments
with
serial
prefix 29428 and below, inlocate U12 and U13 onthe
A2
assembly
(front horizontal board). For
instrum
ents with
serial
prefix 2948A and above, locate only U12.
They are
in
sockets.
The
reference designator
is
labeled beside the IC.
4.
Pry
out
the old
ROM
or
ROW
with
a
blade-type screwdriver.
5.
Plug
in
the new ROM or
ROMs
in
the correct sockets and with
the
correct pin orientation.
6.
Check
the
operation
of
the
instrument.
Serial Prefix 2740A and
below:
The recommended replacement for MU12
is
HP
Part
08904-87010. The recommended replacement
for MU13
is
HP
Part
08904-87008.
If
either MU12
or
MU13 fails, replace the other part
also
if
its
part number differs.
Serial Prefix 2742A and above:
The recommended replacement for MU12
is
HP
Part
08904-87011. The recommended replacement
for MU13
is
HP
Part
08904-87009.
rev.
01
JUL91
Firmware UpdatesBardware Modifications
7-9