Teardown, Cleaning, and Reassembly of the Miscellaneous Parts of the Olympus BH-2 Microscope Frames Revision 1 Page 22 of 45
Field-Diaphragm Assembly
There were two versions of the field-diaphragm
assembly used on the BHS/BHSU/BHT/BHTU
microscopes. The older style field-diaphragm assembly
is shown in Figure 74, and the newer style is shown in
Figure 75.
Figure 74 – Field-diaphragm assembly (old style)
Figure 75 – Field-diaphragm assembly (new style)
Remove the Field-Diaphragm Assembly
Using a suitable JIS screwdriver, loosen and remove the
two m2.6x6 screws securing the field-diaphragm
assembly to the base casting (see Figure 76).
Figure 76 – Remove screws securing the field diaphragm
Remove the (now loose) field-diaphragm assembly from
the base casting (see Figure 77), being very careful so as
to not damage the Light Exit Assembly with the field-
diaphragm assembly (the two assemblies are very close
in proximity, and the reflective coating of the primary-
surface mirror of the Light Exit Assembly is extremely
fragile).
Figure 77 – Remove the field diaphragm assembly
Servicing the Field-Diaphragm Assembly (Old Style)
This section applies only to the older style field-
diaphragm assembly (see Figure 74). The newer style
filed-diaphragm assembly is covered later in this
document.
Disassemble the Field-Diaphragm Assembly (Old Style)
The various components of the older style field
diaphragm assembly are shown in Figure 78 (except for
the stop pin, which is shown in Figure 79).
Figure 78 – Components of field diaphragm (old style)
Using a suitable slotted screwdriver, loosen and remove
the slotted diaphragm stop pin from the diaphragm
rotor. See Figure 79.
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