Olympus BHSU, Complete Teardown, Cleaning, And Reassembly

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Complete Teardown, Cleaning, and Reassembly of the Olympus BHSU/BHTU Reverse Nosepiece Assembly Revision 3 Page 17 of 19
Figure 50 – Tighten the corrective optics assembly
Reinstall the Reverse Nosepiece Assembly
Hold the reverse nosepiece assembly in place on the
top of the arm (see
Figure 51 ) and align the three screw
holes in the arm with the tapped holes in the wedge
mount on the reverse nosepiece assembly (see
Figure
52 ).
Figure 51 – Hold reverse nosepiece assembly up to arm
Figure 52 – Align holes for the mounting screws
While holding the reverse nosepiece assembly in this
position, use a suitable JIS screwdriver to reinstall three
M2.6X14 pan-head screws to secure the reverse
nosepiece assembly onto the arm (see
Figure 53 ).
Figure 53 – Reinstall three screws to secure it to the arm
Ready for Service
The microscope stand with the newly reconditioned
reverse nosepiece assembly is now ready to be put back
into service.
Requirements for Periodic Maintenance
Periodic cleaning and application of fresh grease to the
mechanical detent notches in the stationary base is
necessary to minimize wear of the mechanical detents,
thereby maximizing the useful service life of the reverse
nosepiece assembly. Follow the procedures detailed in
this document to remove the reverse nosepiece
assembly from the microscope stand, remove the
wedge mount and corrective-optics assembly, and then
remove the protective cover to expose the mechanical
detent notches. Next, clean and re-grease the exposed
mechanical detent notches and reassemble the reverse
nosepiece assembly, and then reinstall it onto the
microscope stand. If the equipment sees heavy usage,
this service should be performed on a six-month
interval
3
.
Problems with the Turret Assembly
A few problems with the turret assembly can
sometimes be found in the reassembled nosepiece. The
first will be seen if one or more of the mechanical
detents are excessively worn. This will cause radial float
of the revolving turret in one or more of the objective
positions, and these objectives will have trouble
returning to and maintaining their proper index
position. This can make it difficult to utilize some
illumination types, such as phase contrast, since the
3
Field experience has shown that even heavily used scopes (such as those
used in hospitals and clinical lab settings), when lubricated on a six-month
interval, can be expected to provide many years of trouble-free service.