OlympusBH‐2(BHT/BHTU)Electronics Revision2 Page17of24
LampHouseRepairProcedure
1
Asan alternativetotheJ.C.Ritcheyrepair kit, a BenderandWirth990 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&Wirthpart,startbyremovingthehalogen
lampandsettingitaside,beingcarefultonottouchtheglasswith
your fingers.Next, remove the lamp reflector, if present, by removing the small screw securing the reflector to the
supportpost.Removethebackcoverbycarefullyheatingtheperimeterofthehousingwithaheatgun
toloosenthe
adhesive,while pushingfrom inside the housing,behindthelamp socket,withascrewdrivertiptofreethe 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
securingtheoldlampsocketinplace.Unsolderthetwo wirestofreetheoldsocketfromthehousing.Trimandstrip
thewiresonthenewsockettomatchthoseoftheoriginalsocket,andsolderthenew
socketinplace.Reinstallthetwo
screws to secure the new socket in its proper position.Reinstall the back cover, securing with suitable epoxy, and
reinstallthelampreflector(ifapplicable).Reinstallthehalogenlamp(betterstill,installanewlamp),beingcarefulto
nottouchtheglasswithyourfingers.
Iftheglassisaccidentallytouched,cleanitwithisopropylalcoholbeforeuse.
HalogenLamp
TheBHT/BHTUstandusesaPhilips#7388halogenprojectorlampwithaclearquartzenvelopeandaG4base(seeFi gure
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 Table 1 may be used for
replacementsaswell.
Figure20–Philips#7388FHE/ESBT3HalogenProjectionLamp
Manufacturer PartNumber
Philips 7388(256784)
Osram 54261or64250HLX
Ushio FHE/ESB(1000532)
GE 778(49718)or788(943117)
Nikon 79099
Olympus 8‐C405
Reichert 11143
Swift MA‐780
Table1–SuitableHalogenLampsforOlympusBHT/BHTUMicroscopes
1
LamphouserepairprocedurecourtesyJerryClementofJ &HMicroscopeService,Inc.
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