Olympus BH2 Series Vollständige Demontage, Reinigung und Wiedermontage - Seite 7
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Introduction
The various microscopes in the Olympus BH-2 line (BHS,
BHSP, BHSU, BHT, BHTP, and BHTU) have largely been
replaced in the professional and clinical world, due to
their advancing age and the lack of repair parts from
Olympus. A great many of these microscopes were
produced in their day, and because of this they are
readily available on the used market for very reasonable
prices. Thanks to their excellent build quality and solid
optical performance, these scopes are now very popular
with hobbyists, providing an affordable, high-quality
alternative to the Chinese-made scopes prevalent
today. One problem that is frequently encountered
when purchasing one of these scopes is that the focus
action may feel stiff and may have objectionable
hysteresis, due to the decades-old grease in the coaxial
focus mechanism. This document addresses both of
these issues in the Olympus BH-2.
Scope of this Document
This document shows the complete teardown,
cleaning/lubrication, and reassembly of the coaxial
focus mechanism in an Olympus BHTU stand.
similarity, this applies to the following models.
BHT/BHTU (20W versions) BHS/BHSU (100W versions)
BHT
BHTP
BHTU
A Few Notes Before Starting
A Caution Regarding Stiff Focus Mechanisms
Avoid turning the fine-focus knobs on any BH-2
microscope stand whose coarse-focus mechanism feels
abnormally stiff. Turning these knobs when there is
excess resistance in the mechanism, such as may be
caused by dried grease, puts high stresses on the plastic
drive gears in the fine-focus mechanism, which can be
damaged if these stresses are too high.
Left-Hand and Right-Hand Side Designations
Throughout this document, references are made to the
left-hand and right-hand sides of the microscope stand.
These designations are from the perspective of the
equipment operator; the tension-adjustment knob is on
the right-hand side and the pre-focus stop collar and
condenser height knob are on the left-hand side.
Label Parts for Identification and Reassembly
There are many small parts that make up the BH-2
coaxial focus mechanism. It is critical that these be
bagged and tagged as they are removed, to prevent
them from getting lost and to facilitate their proper
identification during reassembly.
Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism
BHS
BHSP
BHSU
Cleaning Grease from Parts
When cleaning old grease from the various mechanical
parts, submerge the part in the solvent (if possible) and
allow it to soak for a sufficient time for the grease to
dissolve to the point where it can be scrubbed off with a
stiff brush or wiped away with a tissue or rag wetted
with the solvent.
green wax) between the teeth of the gears and
between the teeth of the focus-rack, although
stubborn, can be removed by physically scraping it out
with the tip of a toothpick, following a sufficient soak in
a suitable solvent.
Tools Needed
The following tools will be needed to complete the
teardown, cleaning, and reassembly of the coaxial focus
mechanism in a BH-2 microscope stand.
• Allen tool or driver: 1.3mm
• Allen tool or driver: 1.5mm
• Allen tools or drivers (2): 2.5mm
• Allen tool or driver: 3mm
• Electric heat gun (item T1 of
By
• Pliers, tongue-and-groove
• Pliers, soft jaws (item T2 of
• Screwdriver set, JIS (item T3 of
• Screwdriver, slotted, 3mm
• Tweezers, fine-tipped
• X-Acto® knife
Electric Heat Gun
An electric heat gun is an absolute necessity for
servicing BH-2 microscopes. Heat is ideal for loosening
old grease to free stuck or stubborn mechanisms and
for softening the glues and thread-locking adhesives
used throughout these microscopes. Do not try to
service your BH-2 stand without a suitable heat gun.
Stripped fasteners will be the result if you ignore this
warning.
A Few Words about JIS Screws
Screws with JIS heads are found in much of the older
equipment designed and manufactured in Japan. JIS
screws look very much like standard Phillips screws, but
they differ in that JIS screws were designed to not cam-
out under torque, whereas Phillips screws were
designed to intentionally cam-out as a means to limit
the torque applied to the fasteners. Because of this
crucial difference in the geometry of the two screw
types, JIS screws will be damaged by standard Phillips
drivers if too much torque is applied during installation
or removal. JIS screws can usually be identified by the
presence of a single dot, or by an "X", stamped into one
The solidified grease (resembling
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Appendix
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