Service and Maintenance
2
Keysight U1818A/B Operating and Service Manual
35
2
Make sure soldering iron tip is free of excess solder. Grab each wire lead with
tweezers and pull very gently up. Touch the soldering iron to solder joint just
long enough for the wire to come free of the probe head tip. Do not keep the
soldering iron in contact with the tip any longer than necessary in order to limit
burning and damage to the PC board. This solder joint has very low thermal
mass so it should not take very long for the joint to melt and release.
3
Prepare the mounting hole(s) for new wire(s) by insuring that the holes are
filled with solder. If they are not, use the soldering iron and solder to fill the
holes. Again, do not leave the iron in contact with the tip any longer than
necessary. When the hole(s) are filled with solder use the flux pencil to coat
the solder joint area with flux.
4
Cut two wires to a length of about 12.7mm (0.5inches).
5
Using tweezers, put 90 degree bend at the end of the wire. Leave enough wire
at the bend such that it will protrude through the board when the wire is
installed.
6
Holding the wire in one hand and the soldering iron in the other hand, position
the end of the wire lead over the solder filled hole. Touch the soldering iron to
the side of the hole. When the solder in the hole melts, the wire lead will fall
into the hole. Remove soldering iron as soon as lead falls into the hole. Again,
the thermal mass of the joint is very small, so extra dwell time is not needed
with the soldering iron to insure a good joint.
7
Cut the wires that protrude on the bottom side of the probe head board even
with the solder pad.
8
Place the wires through the hole in the trim gauge with the probe head
perpendicular to the trim gauge. Refer to
Figure 2-27
.
