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Model
8904A
Service
Tools:
No.
2
Pozidriv Screwdriver
Needlenose Pliers
PC Board Extractor
(included with Service Manual
or order:
HP
08904-00013)
1.
Turn instrument
off,
unplug power cord
and remove bottom cover.
2.
Disconnect ribbon cable, W17. from
A1
OJ1
\
3.
Remove hold-down screw and washer
from center of A10 Ouput Assembly
using Pozidriv screwdriver.
\
4.
Pull A10 from each of its seven
mounting posts. Release each mounting
post by compressing the holding tang
on mounting post with needlenose pliers
while applying gentle upward pressure
with the PC board extractor. (Extractor
should exert pressure on metal shield,
not on PC board, except where post
does not extend through shield.)
\
\
5.
Lift A10 from instrument and carefully
lay A10 aside (coax cables will still be
connected).
6.
Replace hold-down screw (from step 3)
with spacer (found under A10) into
mounting hole in center
of
A3. This
screw must be in place during
adjustment procedure for A3.
I
Figure
8-1
1.
How
to
Access
A3
in
Instruments Equipped
with
Option
002
Troubleshooting (Digital/Output Interface)
8-3
1