Mandrel Replacement
3LH500
Reference: Use this instruction with replace-
ment part 3LH500.
Tools Needed: Phillips screwdriver, flat-
bladed screwdriver, 1/16”
Allen wrench, probe align-
ment tool and instructions
(included).
CAUTION: Improper connections may
cause damage to the instrument.
Instruction:
1. Turn off the power and unplug the instru-
ment.
2. Remove the two screws from the head
cover (A) and lift off the head cover.
3. Loosen the two mandrel setscrews (B)
and the probe setscrew (C).
4. Hold the probe gently while pulling the
mandrel down past the probe and off.
5. Carefully, push the new mandrel up past
the probe and into position on the flange.
6. Seat the mandrel firmly up into the man-
drel hole, with the stir/freeze wire channel
perpendicular to the front edge of the
chassis and no gaps between the flange
and the underside of the chassis.
7. Without overtightening (overtightening
can damage the mandrel), re-tighten the
two mandrel setscrews to hold the man-
drel in place.
8. Use the probe alignment tool and instruc-
tions to properly position the probe and
stir/freeze wire.
9. When the probe is in the position
required, tighten the probe setscrew just
enough to firmly hold the probe, but not
crack or distort the thin plastic wall of the
mandrel.
10. Arrange the probe leads so that they will
not touch the clapper or be pinched by the
head cover, and replace the cover.
11. Plug in the power cord and return the
instrument to operation.
For additional information or technical assistance,
please contact Advanced Instruments Hot-Line
®
Service Center (U.S. 1-800-225-4034, outside
North America +US 1-781-320-9000).
3LHP500 Rev1
(4D35/3255 Service Manual)
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