Olympus BH2-CH Substage Assembly - Page 7

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used to clean most painted surfaces).

many solvents will dissolve or damage plastic parts. Do

not allow untested solvents to contact the plastic

condenser-height knob or the plastic gear rack, as these

parts may be damaged by exposure to solvents. Before

using any solvent to clean plastic parts, test a small

amount of the solvent in an inconspicuous area of the

part (such as inside the knob) to ensure compatibility

with the plastic. Never use xylene to clean nylon parts,

as xylene dissolves nylon.

trichloroethylene will cause swelling of nylon due to

solvent absorption.

considered safe for nylon includes acetone, diethyl

ether, heptane, mineral spirits, naphthalene, and

turpentine.

Common Problems with the BH2-CH Substage

A few of the more common problems which can affect

the BH2-CH substage assembly are discussed below.

Inability to Center the Condenser

Stiffness in the centering plunger or in the centering

yoke in the condenser-centering mechanism can cause

impaired condenser centering of the BH2-CH. This is

usually caused by dried, stiff grease in the centering

mechanism, and can be corrected by performing the

teardown,

cleaning/lubrication,

procedure described in the relevant sections below.

Stiffness in the Condenser-Slide Mechanism

Stiffness in the condenser-slide mechanism can cause

damage to the plastic condenser-height rack if the

problem gets bad enough. This is usually caused by

dried, stiff grease in the condenser-slide mechanism,

and can be corrected by performing the teardown,

cleaning/lubrication,

described in the relevant sections below.

Erratic Condenser-Height Adjustment

Erratic operation, no operation, or binding of the

condenser-height mechanism can be caused by dirt or

debris in the teeth of the pinion gear or in the teeth of

the plastic condenser-height rack, or by damage to the

teeth of the condenser-height rack. If the problem is

caused by dirt or debris in the teeth of the rack or

pinion gear, this can be corrected by performing the

teardown,

cleaning/lubrication,

procedure described in the relevant sections below. If

the problem is caused by damage to the condenser-

height rack, this can be corrected by replacing the rack

but the rack should only be replaced as part of the full

teardown,

cleaning/lubrication,

Parts for the BH2-CH, including the condenser-height rack, are no longer

available from Olympus.

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

Additionally,

Isopropyl alcohol and

The list of solvents generally

and

reassembly

and

reassembly

procedure

and

reassembly

and

reassembly

procedure described below, since damage to the new

rack can be caused by dry, thickened grease in the

condenser-slide mechanism.

Teardown/Reassembly of BH2-CH Substage

The procedure for disassembling, cleaning/lubricating,

and reassembling the BH2-CH substage assembly is

described in the sections below. During the teardown

of the BH2-CH substage assembly, be sure to bag and

tag the various components, to prevent their loss and to

facilitate their proper identification during later

reassembly.

Remove the Condenser-Slide Assembly

The first step in the disassembly procedure is to remove

the condenser-slide assembly from the main housing of

the substage. To do this, use the condenser-height

knob to adjust the position of the condenser slide until

the hole in the condenser slide aligns with the slotted

stop screw (see

Figure 2 – Adjust condenser height until screw is visible

Next, use a suitable slotted screwdriver to remove the

M2.6x4 slotted stop screw (see

Figure 3 – Unscrew and remove the slotted stop screw

Rotate the condenser-height knob clockwise until the

condenser-slide assembly disengages from the bottom

of the main housing (see

Figure

2).

Figure

3).

Figure

4).

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