Olympus BH2 Series Smontaggio, pulizia e rimontaggio completi - Pagina 13
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Figure 18 – A view of the fine-focus gear cluster
Remove the Fine-Focus Thrust Washers
Figure 19
shows the two fine-focus thrust washers that
are located beneath the left-hand fine-focus knob.
These consist of a curved-disk spring washer, which sits
on top of a nylon thrust washer, which in-turn sits on
the shoulder of the brass shaft mount. These two
washers will be visible once the left-hand fine-focus
knob has been removed. Although these washers are
normally found in position over the shoulder of the
brass shaft mount (see
them there, look inside the fine-focus knob which was
removed from the left-hand side.
Figure 19 – A view of the fine-focus thrust washers
Remove the curved-disk spring thrust washer from the
nylon thrust washer first, and then remove the nylon
thrust washer from the shoulder of the brass shaft
mount. The spring thrust washer will come off easily,
but the nylon thrust washer may be somewhat
stubborn due to the presence of dried grease beneath
it, holding it in place. If this proves to be the case, use
gentle heat and a sharp X-Acto® knife to separate the
nylon thrust washer from the shoulder of the brass
shaft mount (see
Figure
heat here so as to not melt or deform the plastic knob
Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism
Figure
19), if you don't find
20). Be careful when applying
or the nylon thrust washer. Also, be careful that you do
not damage the nylon thrust washer with the X-Acto®
knife blade.
Figure 20 – Remove the nylon thrust washer
Remove the Left-Hand Coarse-Focus Knob
Use a suitable JIS screwdriver to remove the three
M2.6X5 screws securing the left-hand coarse-focus
knob onto the brass shaft mount (see
that these screws can be somewhat stubborn, and it is
surprisingly easy to strip the screwheads while trying to
remove these screws. To improve the odds of removing
these screws without damaging the screwheads, apply
gentle heat with a heat gun (don't melt or deform the
plastic knob) and then seat the screwdriver tip into the
screw heads and lightly tap the screwdriver handle with
a soft-faced mallet to try to break the screws loose
before removing them. Do not strike the screwdriver
handle too hard with the mallet or you may crack the
plastic knob.
Figure 21 – Remove screws holding the coarse-focus knob
Once the three screws securing the left-hand coarse-
focus knob onto the brass shaft mount have been
removed, pull the knob free of the brass shaft mount
(see
Figure
22).
Figure
21). Note
Revision 4
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