(2) Remove the earphone shield (8), the
the pins with the contacts may dam-
preformed packing (7), and the ear-
age the element.
phone element (6) from the handle.
(2) Replace the preformed packing (7)
over the earphone element (6).
d. Replacing Earphone Element.
(3) R e p l a c e the earphone shield (8)
(1) Place the earphone element (6) in
over the preformed packing.
the handle with the pins aligned
with the contacts in the handle.
cover (9) and tighten it by turning
Failure to properly align
Microphone element (MK1)
Earphone element (HT1)
P r e f o r m e d packing (MP7)
Preformed packing (MP8)
Microphone shield (E2)
Earphone shield (E1)
M i c r o p h o n e mouthpiece (MP6)
Cable assembly (W1)
Figure 2. Handset H-189/GR, microphone and earphone elements removed.
e. Lubrication of O-ring in Connector U-
Compound (FSN 5870-221-5903) to the O-
The O-ring (10, fig. 2) fits
in a groove
ring to permit it to roll in its groove. Apply
inside the body of the U-229/U. It provides
it as often as necessary to obtain smooth con-
a seal when the H-189/GR is connected to a
nect and disconnect of the U-229/U.
radio set. The O-ring may become lost or
Caution: DO NOT allow any of the
damaged when it is being connected or dis-
lubricant to be applied to the con-
connected. To prevent this, apply a small
amount of Dow-Corning Co. DC-4 Silicone