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1. Introduction

If this is the case, it means that the field diaphragm was

not at its maximally open position when the knurled

field-adjustment ring was reinstalled. If this happens,

remove the filter holder and knurled ring, and then

reinstall them to obtain a different mesh point of the

geared portion of the knurled ring with the field

diaphragm assembly, such that the full range of motion

can be obtained (see

Figure 188

take a few attempts to find the correct mesh point.

Once the full adjustment range of the field diaphragm

has been verified, use a suitable JIS screwdriver to

reinstall the three m2x7 screws to secure the filter

holder in place (see

Figure

Figure 190 – Secure filter holder in recess of knurled ring

The Light Exit Assembly is now reassembled and ready

to be put back into service.

Figure 191 – Light Exit Assembly ready for service

Collimating the Integral Substage Lighting

If during the course of servicing the stand, the Light Exit

Assembly and/or the pillar arm have been separated

from the base casting, it is recommended that you

perform a collimation of the substage lighting system,

per the

Collimating the Substage Lighting of the

Olympus

BHS/BHSU/BHT/BHTU

document in this series, before using the microscope.

Teardown, Cleaning, and Reassembly of the Miscellaneous Parts of the Olympus BH-2 Microscope Frames

and

Figure

189). It may

190).

Microscopes

Although this collimation is not strictly required

should be done if you wish to obtain the best optical

performance that your microscope is capable of

providing.

A Few Words About Dust Protection

The bases of the BHS/BHSU and the BHT/BHTU stands

are reasonably well sealed against dust intrusion during

normal operation when the lamphouses are installed.

There are, however, a few things to be aware of for

long-term storage of these stands. On the BHT/BHTU

stands, the barrel of the Light Inlet Assembly seals the

light-inlet port on the back of the base, whether or not

the 20W lamphouse is installed, so long-term storage of

BHT/BHTU scopes should not be a problem.

The rear opening of the BHS/BHSU scopes is a different

story, however. The light-inlet port on these scopes is

only sealed when the 100W lamphouse is attached to

the stand, since the light-inlet optics are integral to the

lamphouse and are not present in the stand.

Accordingly, if the BHS/BHSU stand is stored without

the lamphouse attached, the light-inlet port on the back

of the base will be wide open, allowing dust to foul the

primary surface mirror. Olympus provided a plastic dust

cap (see

Figure 192

and

port when the lamphouse is not installed, and this

should be used to keep dust out of the base whenever

the stand is stored without the lamphouse attached.

Figure 192 – Dust cap for BHS/BHSU light port (top view)

A great many of the BH-2 scopes in use today have been disassembled for

service at one time or another and have not been re-collimated upon

completion of the repair.

Figure

193) to seal the light

Revision 1

Page 43 of 45

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