Olympus BH2-BI30, Complete Teardown, Cleaning, And Reassembly

Page: 31 / 34

Complete Teardown, Cleaning, and Reassembly of the Olympus BH2-BI30 Binocular Viewing Head
(
Rev. 1) Page 31 of 34
Use a suitable JIS screwdriver to reinstall an M2x10 JIS
screw into the front of the right-hand plastic finger grip
to secure it to the right-hand ocular slide (see
Figure
128
)
Figure 128 – Reinstall front screw into the finger grip (right)
Use a suitable JIS screwdriver to reinstall two M2.6x5 JIS
screws through the two holes in the right-hand ocular
slide (from the back) to secure the right-hand finger grip
to the ocular slide (see
Figure 129
).
Figure 129 – Reinstall back screws into the finger grip (right)
If desired, you may skip the precise alignment
procedure in the following section and proceed instead
to the to the
Reinstall the Helical Focus Ring (Left) –
Less Accurate section of this document, which will allow
you to install and adjust the zero-diopter point of the
helical focus ring quicker and more simply, but with
potentially less accurate results
.
Reinstall the Helical Focus Ring (Left) – Most Accurate
Place the helical focus ring onto the left-hand ocular
tube (see
Figure 130 ) and use a 1.3mm Allen wrench or
driver to temporarily snug the three M2.6x4 set screws
to temporarily secure the focus ring in position (see
Figure 131 ).
Figure 130 – Place helical focus ring onto ocular tube (left)
Figure 131 – Tighten set screws to secure helical focus ring
Temporarily reinstall the BH2-BI30 binocular viewing
head onto a suitable BH-2 microscope stand and place a
single 10x ocular into the right-hand ocular tube. Set
the microscope up to view a suitable specimen through
this single ocular, and carefully focus on an easily-
identified test feature of the specimen slide. Now take
the 10x ocular out of the right-hand ocular tube and
place it into the left-hand ocular tube. Using the same
eye as before, once again view the specimen (with the
ocular in the left-hand tube this time) and carefully
adjust the helical focus ring on the left-hand ocular tube
(but do not touch the coarse or fine focus knobs on the
stand) to obtain a sharp focus on the test feature,
similar to what was previously observed through the
other ocular tube. Once the image has been optimally
focused, the helical focus tube is adjusted to the zero-
diopter point, although the zero-diopter marking on the
focus ring will likely not be aligned with the white dot
on the plastic finger grip. To correct this, use a 1.3mm
Allen wrench or driver to carefully loosen the three
M2.6x4 set screws securing the helical focus ring to the
black helical tube, without turning the black helical tube
in the process (see
Figure 132 ).