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Service Model 8904A
HOW
TO
RESTORE OPTIONS
001,003,
AND
005
IN
A REPLACEMENT A2 DIGITAL ASSEMBLY
Description
If the
A2
Digital Assembly has been replaced by a new
or
exchange assembly, the instrument’s serial
number suffix will need to be entered into non-volatile memory (RAM). (Restoration of the serial
number
is
documented in the previous procedure.) After the serial number has been restored, Options
001,
003, and
005
can, where applicable, be restored.
The procedure requires entering of an option Codeword which is unique to the serial number and
option number. The Codeword is printed on a label inside the instrument.
The procedure
is
written with simple steps followed by detailed notes. Normally,
it
is
only necessary
to
follow the simple steps and ignore the notes. Refer to the notes when a step doesn’t work quite right.
Procedure
1.
Switch
LINE
to
OFF
and then back to
ON.
After the instrument powers up, the display should
read
*
HP
8904A
Main
Selection
Level
*
fl
Channel Config.
2.
Press
SHIFT PRESET.
Check that the serial
suffix
matches the number on the rear panel and
check that the option being restored is not already present. The display will look something like
the following then after about
3
seconds
it
will time out. (The example shows an instrument
with serial suffix 12345 with Options 002 and
001
installed.)
I
HP
8904A
Opts
02/01
I
Firmware Revision
18387A
Serial
No
12345
NOTE
a. The
SHIFT
key
is
the blue key. The
PRESET
key
is
labeled in blue above
the
C.
key.
b. After
3
seconds
the
display will time out and read
as
in step
1.
Press
SHIFT PRESET
as
often
as
needed to view the option and serial display.
c.
If the serial
suffix
is
00000,
the instrument will need its serial number
entered. Refer to
How to Restore the Serial Number in a Replacement
A2 Assembly.
d. The displayed option numbers are only
two
digits (for example,
01)
even
though
the
official option numbers are three digits (for example,
001).
e. The presence of options other than the one being retrofit doesn’t ’matter.
8-46
Troubleshooting (Options
001,
003, and
005)