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Lamp House Repair Procedure

As an alternative to the J.C. Ritchey repair kit, a Bender and Wirth 990 lamp socket (available from J & H Microscope

Services or from Bulbworks) may be used to replace the existing lamp socket. To replace the socket with the new

Bender & Wirth part, start by removing the halogen lamp and setting it aside, being careful to not touch the glass with

your fingers. Next, remove the lamp reflector, if present, by removing the small screw securing the reflector to the

support post. Remove the back cover by carefully heating the perimeter of the housing with a heat gun to loosen the

adhesive, while pushing from inside the housing, behind the lamp socket, with a screwdriver tip to free the loosened

back piece. Avoid direct heat or pressure to the ventilation slots on the back cover, as they are fragile and can be

damaged. Once the back cover has been removed, clean off any remaining adhesive and remove the two screws

securing the old lamp socket in place. Unsolder the two wires to free the old socket from the housing. Trim and strip

the wires on the new socket to match those of the original socket, and solder the new socket in place. Reinstall the two

screws to secure the new socket in its proper position. Reinstall the back cover, securing with suitable epoxy, and

reinstall the lamp reflector (if applicable). Reinstall the halogen lamp (better still, install a new lamp), being careful to

not touch the glass with your fingers. If the glass is accidentally touched, clean it with isopropyl alcohol before use.

Halogen Lamp

The BHT/BHTU stand uses a Philips #7388 halogen projector lamp with a clear quartz envelope and a G4 base (see Figure

20). This lamp, which has a color temperature of 3200K, a color rendering index of 100, and outputs 475 lumens, is

rated for 6V/20W with an advertised life of 100 hours at full brightness. The Philips #7388 may be purchased from

Bulbworks or Amazon. Alternatively, any of the manufacturer's part numbers listed in

replacements as well.

Lamp house repair procedure courtesy Jerry Clement of J & H Microscope Service, Inc.

Olympus BH‐2 (BHT/BHTU) Electronics

Figure 20 –Philips #7388 FHE/ESB T3 Halogen Projection Lamp

Manufacturer

Philips

Osram

Ushio

Nikon

Olympus

Reichert

Swift

Table 1 – Suitable Halogen Lamps for Olympus BHT/BHTU Microscopes

778 (49718) or 788 (943117)

Revision 2

Table

Part Number

7388 (256784)

54261 or 64250 HLX

FHE/ESB (1000532)

79099

8‐C405

11143

MA‐780

1 may be used for

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