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Model
8904A
Instrument Changes
7-1
1.
MODIFICATION FOR FRONT PANEL
ASSEMBLY
(Serial Prefix 2712A
to
2917A)
INTRODUCTION
HP
part number
08904-61023
contains the parts to replace the front panel in
HP
8904A
Multifunction
Synthesizers with serial prefix
2917A
or
below. The front-panel keys in these instruments may have
a tendency to intermittently
stay
down when pressed. This problem cannot usually be cured by
mechanical adjustment of front-panel parts
or
by replacement of individual parts.
The kit is easy to install and requires no special tools. The contents of the kit are listed in table
7-3.
The
A5
LCD
Display is not included in the kit and must be transferred from the old front-panel
assembly.
Table
7-3.Parts List
for
HP 08904-61023 Bont-Panel Kit
Qty
1
11
2
3
4
1
1
1
1
1
Description
Keycap
Screw,
3.0~6
mm,
Panhead,
Torx,
Screw,
25x4
mm,
Flathead, Pozidriv
Flatwasher,
3
mm
ID
Hole
Plug,
0.5
inch Diameter
Display Shield
Line Switch Bracket
Keypad
Keyboard
Assembly
(Al)
Front Panel Assembly
with Captive Lockwasher
HPPartNumber
1
CD
0371 -3802
051 5-1 851
051 5-2028
3050-0891
6960-01 32
08904-00021
08904-00022
08904-40006
08904-60201
08904-61 021
3
4
9
7
1
4
1
5
4
8
INSTALLATION PROCEDURE
Removing Covers
Use standard electrostatic discharge
(ESD)
precautions when working around
electrostatic-sensitive components such
as
on the display and digital assem-
blies.
NOTE
Refer to the figures
in
Section
6
of
the HP 89044
Service Manual
and
figure
7-6
in
this
installation note for part identification and location.
1.
Turn the instrument
off
and unplug the power cord.
2.
Remove the top and bottom covers by unscrewing the screw in the middle
of
the rear edge
of
the
covers. This is a captive screw and will cause the cover
to
push away from the frame.
reu.15DEC89
Firmware UpdatesIHardware Modifications
7-15