3M Littmann Classic II S.E. Manual page 7

Removing the Diaphragm and
Cleaning the Chestpiece
With the diaphragm side up,
grasp the rim with the thumbs
and index fingers of both hands
and roll the rim off the edge of
the chestpiece. Remove the
diaphragm from the rim and
clean the parts in soapy water or
wipe with alcohol. Chestpiece
surfaces can be wiped with
alcohol or soapy water. Dry all
parts and surfaces thoroughly
before reassembly.
Assembly and Replacement of
the Tunable Diaphragm
Using your fingertip, apply a small
amount of talcum powder to the
inside surface of the flexible edge
of the diaphragm. This will
facilitate assembly and maintain
smooth and quiet low/high
frequency alternation. Snap the
diaphragm with your fingers to
remove excess talc.
Insert the flexible edge of the
diaphragm into the groove of the
rim. This is best accomplished by
starting with the rim positioned
above the legible side of
the diaphragm.
Visually examine the ring to
ensure that the flexible edge is
smoothly engaged inside the rim.
If necessary, flex the assembly by
pinching the outer rim edge
between the thumb and fingers.
Repeat this flexing procedure
after rotating the assembly
one quarter.
To attach the rim/diaphragm
assembly to the chestpiece,
engage the groove of the rim
(with the diaphragm attached)
around the chestpiece at one
point and hold it in place with
your thumbs.
Slowly roll the rim around and
over the chestpiece edge using
both thumbs, moving in opposite
directions around the chestpiece.
Visually inspect the edge where
the diaphragm engages the rim
for uniform containment. Minor
adjustments may be made by
slightly pulling and rolling the rim
away from the diaphragm,
allowing the diaphragm to slip
into position.
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