Remove the First Fine-Focus Knob
Obtain two 2.5mm Allen tools or drivers and insert one
into each of the M3X6 hex socket-head cap screws
securing the fine-focus knobs to the fine-focus shaft
(see
Figure
14).
Figure 14 – Insert Allen drivers into screws in both knobs
Hold the Allen driver in the right-hand knob stationary,
while turning the Allen driver in the left-hand knob
counterclockwise, to loosen one of the screws. Only
one of the two screws will loosen, and it doesn't
particularly matter which one does
that comes loose, along with its accompanying lock
washer. If the screw in the left-hand knob is the one
that came loose, pull the left-hand knob free of the fine-
focus shaft and remove it (see
Figure 15 – Remove fine-focus knob from shaft (left side)
If instead the screw in the right-hand knob is the one
that came loose, hold the right-hand fine-focus knob
stationary with one hand, and with the other hand
simultaneously pull and rotate the left-hand fine-focus
knob until the shaft which is attached to the left-hand
fine-focus knob pulls free of the back of the right-hand
focus knob (which is being held stationary). Once this
happens, carefully remove the right-hand fine-focus
1
Note that, unless stated otherwise, the various images in this document
show the disassembly and reassembly that results when the left-hand screw
loosens.
Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism
1
. Remove the screw
Figure
15).
knob by pulling it straight out, without allowing it to
rotate, until it comes free. It is important to not allow
the knob to rotate while pulling the knob free,
otherwise the fragile nylon gear that is pressed into the
back of the knob could become damaged (see
16).
Figure 16 – Plastic gear in the right-hand fine-focus knob
Remove Second Fine-Focus Knob with Shaft
Grasp the fine-focus knob on the side opposite from
which the knob was just removed and pull straight out
on the knob (see
Figure
and attached fine-focus shaft are free of the hollow
coarse-focus shaft. Place the knob with attached shaft
someplace where it will not roll off onto the floor and
become damaged.
Figure 17 – Withdraw the fine-focus shaft (right side)
Figure 18
shows a view of the fine-focus gear cluster
that is located within the right-hand coarse-focus knob.
The small nylon gear that is pressed into the back of the
right-hand fine-focus knob (see
this gearing, and because nylon gears are somewhat
fragile, you must always exercise caution when
installing or removing the right-hand fine-focus knob, to
prevent damage to these gears.
17) until the fine-focus knob
Figure
16) meshes with
Revision 4
Page 12 of 40
Figure
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