Olympus
BH
‐
2
(BHT/BHTU)
Electronics
Revision
2
Page
15
of
24
Figure
16
‐
AC
Inlet
Jack
Mounted
to
BHT/BHTU
Electrical
Base
(100/115V
Version)
Lamp
House
There
were
two
styles
of
lamp
house
used
on
the
BHT/BHTU
microscopes
(see
Figure
17
).
The
original
LS20
‐
H
version
supplied
by
Olympus
(as
part
number
5
‐
LB402)
did
not
have
a
metal
reflector
behind
the
bulb.
Later
in
the
life
of
the
BHT/BHTU,
Olympus
upgraded
the
lamp
house
to
the
LS20H
‐
M2
(part
number
5
‐
S119),
which
incorporated
a
reflector
behind
the
lamp
in
order
to
provide
more
usable
light.
Since
the
LS20H
‐
M2
lamp
house
is
directly
interchangeable
with
the
earlier
LS20
‐
H
part,
it
should
be
used
whenever
possible.
Figure
17
–
Original
Lamp
House
(left)
and
Newer
Lamp
House
with
Reflector
(right)