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Complete Teardown, Cleaning/Lubrication, and Reassembly of the Olympus BH2-CH Substage Assembly   

Revision 1      Page 25 of 26 

 

Figure 106 – Reinstall the condenser-slide stop screw 

Adjust the Condenser-Height Stop 

The  purpose  of  the  condenser-height  stop  on  the 
BH2-CH substage assembly is to allow the condenser to 
be  raised to the  height  required  to  achieve  the  proper 
setup  for  Köhler  illumination,  yet  prevent  the  upper 
lens  element  from  contacting  the  bottom  of  the  glass 
specimen slide.  The height stop can be adjusted by first 
mounting  the  condenser  into  the  BH2-CH  substage 
assembly,  and  then  adjusting  the  condenser-height 
knob until the stop pin in the condenser slide either hits 
the  stop  (see 

Figure  107

,  shown  with  the  condenser 

removed  for  clarity),  or  reaches  the  desired  maximum 
height (i.e., just short of the point where the upper lens 
element  of  the  condenser  contacts  the  bottom  of  a 
glass slide sitting on the stage surface).   

 

Figure 107 – The condenser set to maximum height 

If  the  mechanism  reaches  the  stop  at  the  proper 
condenser height, no further adjustment is needed.  If it 
does not, use a 1.5mm Allen wrench or driver to loosen 
the  M3x4  set  screw  securing  the  stop  pin  in  position 
(se

Figure 108

and turn the condenser-height knob to 

set the condenser to the desired maximum height, then 
retighten the set screw to lock the stop pin to this new 
position.  The condenser-height stop should be checked 
anytime  a  different  condenser  is  mounted  into  the 
BH2-CH substage assembly, and should be readjusted if 
necessary to prevent the condenser from contacting the 

bottom  of  the  glass  slide.   

Caution:

  Never  loosen  the 

M3x4 set screw securing the condenser-height stop pin 
(se

Figure  108

)  unless  the  condenser  is  at  or  near  its 

maximum  height  setting,  otherwise  the  spring  in  the 
stop mechanism might eject the stop pin.   

 

Figure 108 – The set screw for the condenser-height stop 

Ready for Service 

The BH2-CH substage assembly is now ready for service 
and can be reinstalled onto the microscope stand. 

 

Original Olympus Documentation 

A  scanned  PDF  of  the 

Olympus  Research  Microscope 

Series  BH2  (BHS)  Repair  Manual 

is  available  for 

download  at  various  microscope-related  hobbyist  sites 
on the internet, and can be found by searching for the 
title in an internet search engine, such as Google. 

 

Figure 109 – Olympus BH2 (BHS) repair manual 

How to Contact the Author 

Please  feel  free  to  direct  any  questions  or  comments 
regarding  this  document  (or  BH-2  microscopes  in 
general)  to  the  author,  at  the  following  email  address: 

[email protected]

 

Summary of Contents for BH2-CH Substage

Page 1: ...org Permission is hereby granted to distribute this PDF document in its entirety for personal non commercial purposes only provided that the contents are not modified in any way including the copyrigh...

Page 2: ..._________________________________________________11 Disassemble the Centering Plunger_________________________________________________________________12 Reassemble the Centering Plunger ______________...

Page 3: ...fit of the stop pin in the bore 11 Figure 25 Clean any debris or burring from the bore 11 Figure 26 Reinstall the stop pin spring into the bore 11 Figure 27 Reinstall the stop pin into the bore 11 Fig...

Page 4: ...ll from the pinion gear 20 Figure 77 Withdraw the pinion shaft from main housing 20 Figure 78 Remove metal washer from the pinion shaft 20 Figure 79 Remove nylon washer from the main housing 20 Figure...

Page 5: ...y Revision 1 Page 5 of 26 Figure 105 Align the hole in slide with the tapped hole 24 Figure 106 Reinstall the condenser slide stop screw 25 Figure 107 The condenser set to maximum height 25 Figure 108...

Page 6: ...the equipment designed and manufactured in Japan JIS screws look very much like standard Phillips screws but they differ in that JIS screws were designed to not cam out under torque whereas Phillips...

Page 7: ...w Erratic Condenser Height Adjustment Erratic operation no operation or binding of the condenser height mechanism can be caused by dirt or debris in the teeth of the pinion gear or in the teeth of the...

Page 8: ...ing thumbscrews from the support yoke see Figure 6 Figure 6 Remove the centering thumbscrews Remove the Slip Plates The condenser slide assembly is shown in Figure 7 Figure 7 The condenser slide assem...

Page 9: ...osition on the centering yoke as shown in Figure 12 and press in on the centering yoke to depress the centering plunger Figure 12 Depress the centering plunger While holding the centering yoke such th...

Page 10: ...from the face of the dovetail slide whichever is applicable see Figure 19 Figure 19 Remove brass shim for condenser height rack Disassemble the Condenser Height Stop Hold the M5x12 condenser height st...

Page 11: ...n the bore without any noticeable friction or binding see Figure 24 Figure 24 Test the fit of the stop pin in the bore It is critical to the operation of the condenser height stop that this pin move f...

Page 12: ...ble slotted screwdriver to loosen but do not remove the plunger retaining screw see Figure 30 Figure 30 Loosen the plunger retaining screw Unscrew and remove the plunger retaining screw being careful...

Page 13: ...r with attached c clip into the centering plunger bore in the face of the dovetail slide see Figure 37 Figure 37 Reinstall plunger and c clip into bore Insert the plunger extension spring into the cen...

Page 14: ...or condenser height rack Clean any grease or debris from the condenser height rack Use a suitable JIS screwdriver to loosely reinstall the two M2 6x6 JIS screws and two washers to hold the rack in pos...

Page 15: ...the original locations where they were found during disassembly see Figure 48 Figure 48 Reinstall any brass shim washers Apply a thin layer of grease to the three slip bosses machined into the suppor...

Page 16: ...gure 55 Figure 54 Lightly grease the centering thumbscrews Figure 55 Reinstall the centering thumbscrews Disassemble the Friction Lock Note Disassembly of the friction lock is not necessary but is sho...

Page 17: ...moved the only thing now holding the right hand dovetail block onto the main housing are two M2x8 alignment pins Remove the right hand dovetail block with the two alignment pins by pulling it straight...

Page 18: ...wrench or driver to loosen the two M3x4 set screws securing the condenser height knob to the condenser height shaft see Figure 66 Figure 66 Loosen set screws in condenser height knob Remove the conden...

Page 19: ...of the tension screw Figure 73 Bearing ball on the end of the pinion gear Place the tip of a suitable punch or nailset tool into the depression in the end of the pinion shaft and lightly tap the punc...

Page 20: ...n the inner ledge of the main housing see Figure 79 Figure 79 Remove nylon washer from the main housing Reinstall the Condenser Height Shaft Using a suitable solvent e g acetone clean any old grease f...

Page 21: ...t Lightly grease the pinion shaft see Figure 84 Figure 84 Place metal washer over greased pinion shaft Insert the greased pinion shaft into the bore on the right hand side of the main housing see Figu...

Page 22: ...ds of the tension screw with the threads in the main housing see Figure 90 Figure 90 Engage threads of tension screw with housing Use a suitable slotted screwdriver to snug the tension screw just a bi...

Page 23: ...the tension screw to lock the tension screw in position see Figure 96 Figure 96 Tighten lock nut to secure tension screw Reinstall the Dovetail Blocks Place the right hand dovetail block into positio...

Page 24: ...nto the flat bearing surfaces of the dovetail slide see Figure 102 Figure 102 Grease flat bearing surfaces of dovetail slide Apply a light coating of grease onto the two beveled bearing surfaces of th...

Page 25: ...ing the stop pin in position see Figure 108 and turn the condenser height knob to set the condenser to the desired maximum height then retighten the set screw to lock the stop pin to this new position...

Page 26: ...sembly Item Description Manufacturer Mfg Part Vendor Vendor Price 2 Grease Molykote 44 medium 28g Dow Corning Molykote 44 Amazon 6 95 3 Nye 704C 50g Nye Lubricants Nye 704C TAI Lubricants Inc 49 95 Ta...

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