3LP700 Rev10
(4C35/4D35/3255/MK05 Service Manual)
Page 4 of 5
yoke vertical position relative to the
head. Retighten the screw, making
sure that the yoke/clapper/stir wire
assembly does not rotate in place.
b. To adjust the vertical position of the
stir wire, loosen the two stir wire
setscrews (Figure 1) in the clapper,
then reposition the stir wire so that it
is resting on top of the small step, as
shown in Figure 3.
c. Firmly retighten the stir wire
setscrews.
Cryoscope Instructions:
1. Facing the instrument from the front,
slide the alignment tool squarely up onto
the mandrel, round-end first, with the
stir/freeze wire located as shown in
Figure 5.
2. Check the probe alignment by making
sure that the probe shaft is lined up along
the raised V centerline of the alignment
tool and the probe level by making sure
that the end of the probe rests on the hori-
zontal surface below the raised V center-
line, as shown in Figure 5. Note that the
orientation of the alignment tool is 90º
from the way the tool is used with an
osmometer.
3. If necessary, make probe centering adjust-
ments:
a. If aligning a metal probe, bend the
metal probe stem gently by hand, as
necessary, to align the probe along the
raised V centerline of the probe align-
ment tool.
b. If aligning a non-metallic probe, DO
NOT ATTEMPT TO BEND THE
PROBE; instead, loosen the probe
setscrew (see Figure 1) and then
rotate the probe so that any curvature
in the probe is in the back-to-front
direction (parallel to the stir wire
action).
c. Gently retighten the probe setscrew
(overtightening will crack or distort
the thin plastic wall of the mandrel).
4. If necessary, make probe vertical adjust-
ments:
a. Loosen the probe setscrew (Figure 1)
and then raise or lower the probe
within its mandrel, as necessary.
b. When the bottom of the probe is
exactly level with the horizontal step,
gently retighten the probe setscrew
(overtightening will crack or distort
the thin plastic wall of the mandrel).
5. After completing any adjustments,
recheck the probe alignment and level.
6. Check the stir wire alignment and level
(see Figure 5 notes). In the front-to-back
direction, the stir wire should be even
with the sample probe.
7. If necessary, make stir wire adjustments:
a. To realign the stir wire in the slot in
the mandrel, note the position of the
top of the yoke relative to the top of
the head, then partially loosen the coil
core/yoke screw (see Figure 4) from
the back of the head. Move the
yoke/clapper/stir wire assembly side-
to-side until the stir wire is in the cor-
rect position relative to the slot.
Make sure to maintain the previously
noted yoke vertical position relative
to the head. Retighten the screw,
making sure that the yoke/clapper/stir
wire assembly does not rotate in
place.
b. To adjust the vertical position of the
stir wire, loosen the two stir wire
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