UVP TB-101 User Manual

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1/16” Allen

Wrench

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Transilluminator Selector Switch Replacement

Overview

The purpose of this Technical Bulletin is to explain the process of uninstalling a faulty selector
switch and installing a replacement switch on a UVP transilluminator. This instruction applies to
transilluminator selector switches used either for wavelength or intensity selection.

To complete this procedure, the following tools will be required:

• Phillips-head screwdriver

• 1/16" Allen wrench

• Pliers

• Flat-head screwdriver

Caution: This procedure requires a moderate level of technical competence. If you are not
comfortable working with electronics, tools and/or related components, contact UVP for
information on returning your transilluminator for repair or replacement.

Note: For information on replacing the transilluminator power switch, see TB-100, “Power Switch
Replacement Instructions”.

Removal Procedure

When performing the following procedure, place all components (screws, nuts, etc.) in a secure
location as they will be reused for installation.

1. Turn off the transilluminator by placing the power switch on the front of the unit in the OFF
position. Then, unplug the unit from the wall power.

2. Using a 1/16” Allen wrench, loosen the set screw securing the selector switch knob to the
selector switch shank.

3. While firmly holding the transilluminator housing, pull forward on the knob to remove it from
the selector switch shank. Note: This process may require a fair amount of force as the knob
fits snugly over the shank.

TB-101 Rev STD

Two of Four

Securing Nut

Selector

Switch Shank

Transilluminator

4. Remove the four Phillips-head screws and washers securing the transilluminator filter
frame to the body of the transilluminator. Lifting up, remove the transilluminator filter frame
from the transilluminator body. Place the filter frame aside.

Filter Frame

Phillips-Head

Transilluminator

Body

Screws and

Washers

5. Using the pliers, remove the securing nut securing the selector switch to the transilluminator
body.

6. Inside the unit, locate the side reflector panels which are two reflective metal panels located

Side

Panel

Back Side of

Switch

at each end of the transilluminator light tubes. Note how these panels are installed prior to
removal, as this will aid with reinstallation later on.

Reflector

7. Pulling straight up, remove the two side reflector panels from inside the transilluminator.

8. Looking inside the front panel of the transilluminator body, locate the back side of the
transilluminator selector switch. Trace the wires from the back of the switch to the gray
wiring junction block located at the front-left corner of the unit. Note which wires are
connected from the switch to the junction block.

Selector