Olympus BH-2 BHTU Manual - Página 9
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Common Problems with the BHT/BHTU Electronics
The electronics in the BHT/BHTU microscopes have proven to be remarkably reliable over the years, but with heavy
usage, failures do occur. The most likely problems in the electronics will be bad or intermittent contacts in the lamp
house and erratic lamp intensity due to dust, dirt, and oxidation within the intensity control.
Worn or oxidized contacts in the socket in the lamp house will cause the halogen bulb to not illuminate, to flicker, or to
illuminate only intermittently. If a replacement lamp house is not available, the troublesome lamp socket may be
replaced with a new one, as described later in this document. It may also be possible to effect a temporary repair by
disassembling the existing lamp socket and cleaning the oxidized contacts with emery paper, but this should be viewed
as a temporary fix only.
Dust, dirt, and oxidation within the intensity control can cause erratic lamp intensity as the control slider is moved
throughout its adjustment range. This can usually be corrected by spraying a short blast of volume control/contact
cleaner (after unplugging the AC line cord) into the intensity control and moving the slider throughout its full range of
motion a few times to distribute the cleaner (see Appendix 1 of this document for a suggested cleaner). Exercise caution
when spraying the cleaner into the control so as to minimize overspray and blow‐back onto nearby components. Be
sure to allow the contact cleaner sufficient time to evaporate out of the control before re‐applying power to the
electrical base.
Obtaining Replacement Components
The BHT/BHTU microscopes are no longer supported by Olympus, and with few exceptions, factory replacement parts
are not available. Some electrical parts (or suitable substitutes) are available from third party sources, and these parts
are listed in Appendix 1 of this document, along with sources and pricing.
The BHT/BHTU microscopes were very popular in their day, and used stands and their various bits and pieces frequently
show up for sale on ebay. If necessary, replacement electrical components can be salvaged from a spare electrical base.
If exact replacements cannot be found, make sure that any substitute parts chosen for repairs have suitable electrical
and mechanical specifications and that they are installed in such a way that it is not possible for the operator to contact
any live voltage points while using the microscope.
Power Transformer
The good news here is that the power transformer (shown in Figure 7) rarely fails. The bad news is it may be difficult to
locate a suitable substitute for it if it ever does fail, due to the unique form factor which allows it to fit into the base of
the BHT/BHTU stand. If a suitable substitute cannot be found for the transformer, this may be a good time to start on
that LED conversion project, while looking for another electrical base.
Figure 7 – Power Transformer Mounted to BHT/BHTU Electrical Base (100/115V Version)
Olympus BH‐2 (BHT/BHTU) Electronics
Revision 2
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