Olympus BH-2 BHT Manual - Halaman 11

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Light Preset Board

The light preset board, which is present on later stands only, contains a single‐turn, 500Ω linear taper potentiometer and

an SPDT rocker switch (see Figure 10). When the rocker switch is in the OFF position, the intensity slide potentiometer

controls the lighting intensity, and when the switch is in the ON position, the screwdriver‐adjust potentiometer controls

the lighting intensity. The schematic for the light preset board is included in Appendix 3 of this document. A suitable

replacement for the potentiometer could likely be found, if necessary. However, the rocker switch is more problematic,

since it is this switch which supports the light preset board in the chassis. Since this board is not necessary for basic

operation of the illumination system, it may be removed and electrically bypassed if suitable replacement parts cannot

be found, or to permit the installation of a newer electrical base into an earlier stand that does not have the chassis

notches to accommodate this board.

Removing and Bypassing the Light Preset Board

Remove the light preset board from the electrical base by unplugging the two connectors from J1 and J2 on the circuit

board. Next, cut the two connectors off of the wires, making the cuts as close to the connector shells as practical, in

order to leave sufficient wire lengths for the remaining steps. Strip the ends of the two orange wires that were

connected to the four pin connector and solder them together, insulating with heat‐shrink tubing in order to prevent

shorting to the chassis. Do the same thing for the two blue wires (one was connected to the two‐pin connector and the

other was connected to the four‐pin connector) and the two red wires (one was connected to the two‐pin connector

and the other was connected to the four‐pin connector). Be sure to route these spliced wires such that they will not be

pinched and will not interfere with the optical path of the illumination system once the stand is reassembled.

Figure 10 – Olympus DV2288‐01 Light Preset Board on Later BHT/BHTU Electrical Base (100/115V Version)

Olympus BH‐2 (BHT/BHTU) Electronics

Revision 2

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