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Introduction

The microscopes in the Olympus BH-2 line (BHS, BHSU,

BHT, 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 are they 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.

The BH2-CH substage assembly (sometimes referred to

as the Condenser Holder) on the BH-2 equipment

mounts onto the sliding focus block of the stand, and

provides a ring for the mechanical stage to mount onto,

as well as a centering mount for the substage

condenser. The height of the substage condenser can

be adjusted, relative to the stage, by a rack-and-pinion

mechanism, and the maximum condenser height can be

precisely set by the adjustable condenser-height stop.

Due to the age of BH-2 equipment, the BH2-CH

substage assembly frequently needs disassembled and

regreased to function well again.

Scope of this Document

This document describes the complete teardown,

cleaning/lubrication, and reassembly of the BH2-CH

substage assembly used on the Olympus BH-2 series of

microscopes.

Tools Needed

The following tools are needed to service the BH2-CH

substage assembly:



Allen wrench or driver, 1.5mm (item 4 of



Allen wrench or driver, 2.5mm (item 5 of



Allen wrench or driver, 3.0mm (item 6 of



Center punch (or nailset)



Pliers, needle-nose (fine-point)



Screwdriver set, JIS (item 7 of



Screwdriver set, slotted

A Few Words about JIS Screws

Screws with JIS heads are found in much of the

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. JIS screws can

Complete Teardown, Cleaning/Lubrication, and Reassembly of the Olympus BH2-CH Substage Assembly

Appendix

usually be identified by the presence of a single dot, or

by an "X", stamped into one of the four quadrants of

the cross-point depression (see

Figure 1 – Head of a typical JIS screw

Supplies Needed

The following supplies are needed to service the

BH2-CH substage assembly:



Cleaning solvent (see

Recommended Solvents



Cotton swabs



Grease (see

Recommended Lubricants



Tissues, oil-free

Recommended Lubricants

Dow Molykote® 44 (item 2 of

(item 3 of

Appendix

1) is recommended for the BH2-CH

substage assembly.

sufficiently light for the greased dovetail slides, and

both types will remain stable and serviceable for many

years to come.

Recommended Solvents

Some type of cleaning solvent will be needed to remove

the old grease from the various components of the

BH2-CH substage assembly. Solvents that can be used

are acetone, diethyl ether, heptane, hexane, mineral

spirits, turpentine, and xylene.

Safety Considerations with Solvents

Regardless of which solvent is chosen, make sure that

adequate ventilation is present during the cleaning

process, and that any necessary personal protective

equipment is utilized to minimize exposure. Consult the

MSDS sheet before using any unfamiliar solvents. Many

of the solvents listed above are flammable, and their

vapors may represent an explosion hazard if

mishandled. Whichever solvents are chosen, be sure to

follow all manufacturer's instructions and safety

precautions.

Solvent Compatibility with Parts and Finishes

Many solvents will damage the finish of painted

surfaces (isopropyl alcohol or 409 Cleaner may be safely

Figure

1).

section below)

Appendix

1) or Nye 704C

Both of these greases are

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