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Instrument Changes Model 8904A
GOOD WRAPPING
Wire is mechanically secure prior to
soldering.
The
wire wrap is at least
three quarters
to
one full turn.
POOR
WRAPPING
(1)
Wire is not mechanically secure prior
(2)
Wrap is less than three quarters turn.
(3)
Wrap
exceeds
one full turn.
to soldering.
~~ ~ ~~
________~
Figure
7-5.
Ground Wire Wrapping
Replacing
the
Ground
Wire
1.
If the wrap on either end of the ground wire
is
not within specification, the ground wire must
2. Remove the screw holding the ground wire to the instrument standoff. (Use a T10
or
T15 Torx
3.
Cut the gray cable tie which secures the main wire harness to the standoff with a pair
of
diagonal
4.
With the main harness free, move
it
up and to the left
so
as not to interfere with soldering.
5.
Heat the soldering iron. You will also need a roll of solder wick.
6. On the line cord socket, heat the solder on the lug where the ground wire is attached and apply
the solder wick.
At
the same time move the ground wire around and pull the ground wire out
of
the lug. Avoid touching any of the loose wires with the soldering iron.
7.
Cut an
8
cm (3.2 inch) length of new
18
gauge ground wire
(HP
8150-2919). Strip
8
mm (5/16
inch)
of
insulation from each end of the wire.
8.
Wrap and solder one end
of
the stripped ground wire onto a new solder lug
(HP
0360-0036).
Refer to figure
7-5
for
wrapping details.
9. Insert the other end of the new ground wire into the empty lug on the line cord socket. After the
wire is properly wrapped, solder
it
in place.
be replaced.
screwdriver as needed.)
wire cutters. Avoid cutting into the insulating sheath of the harness.
7-12 Firmware Updates/Hardware Modifications
rev.
15DEC89