Olympus BH-2 - Understanding Phase Contrast Microscopy; Scope of the Document; What is Phase Contrast?; How Does Phase Contrast Work?

Complete Teardown, Cleaning, and Reassembly of the Olympus BH-2 Coaxial Focus Mechanism Revision 4 Page 3 of 40
Test the Pre-Focus Stop Mechanism................................................................................................................................. 28
Reinstall Stop Screw for the Pre-Focus Lock Collar ........................................................................................................... 28
Reinstall the Left-Hand Coarse-Focus Knob ...................................................................................................................... 29
Reinstall the Fine-Focus Thrust Washers .......................................................................................................................... 29
Reinstall the Fine-Focus Knob with Attached Shaft .......................................................................................................... 29
Reinstall the Second Fine-Focus Knob .............................................................................................................................. 30
Reinstall the Focus Rack onto Sliding Focus Block ............................................................................................................ 30
Grease the Brass Focus Rack (Optional) ........................................................................................................................... 31
Disassemble the Focus Gearbox ....................................................................................................................................... 31
Clean and Reassemble the Focus Gearbox ....................................................................................................................... 32
Reinstall the Focus Gearbox .............................................................................................................................................. 34
Reinstall the Rear Cover .................................................................................................................................................... 35
Reinstall the Fine-Focus Knob Caps .................................................................................................................................. 36
Reinstall the Substage Condenser Carrier ........................................................................................................................ 36
Reinstall the Lamphouse ................................................................................................................................................... 36
Reinstall the Accessories ................................................................................................................................................... 36
Ready for Service .................................................................................................................................................................. 36
Original Olympus Documentation ........................................................................................................................................ 37
Olympus Research Microscopes Series BHS (BHS) Repair Manual ............................................................................... 37
Olympus Research Microscope BH2 Repair Manual ..................................................................................................... 37
How to Contact the Author ................................................................................................................................................... 37
Acknowledgements ............................................................................................................................................................... 37
Appendix 1 ............................................................................................................................................................................ 38
A Caution Regarding the Plastic Gears in the Olympus BH-2 ........................................................................................... 38
Shipping Damage to BH-2 Microscope Stands .............................................................................................................. 38
Preparing BH-2 Stands for Shipping .............................................................................................................................. 38
Appendix 2 ............................................................................................................................................................................ 39
An Alternate Method to Clear Adhesive from the Heads of the Setscrews ..................................................................... 39
Introduction .................................................................................................................................................................. 39
Using Heat as an Alternative Removal Method ............................................................................................................ 39
Removing the Adhesive with Heat ................................................................................................................................ 39
Removing the Setscrews ............................................................................................................................................... 39
Appendix 3 ............................................................................................................................................................................ 40
Sources for Replacement Parts, Tools, and Supplies ........................................................................................................ 40
Table of Figures
Figure 1 – Head of a typical JIS screw ..................................................................................................................................... 8
Figure 2 – Protect the top of the pillar arm from dust ........................................................................................................... 9
Figure 3 – Loosen substage condenser carrier lock screw ...................................................................................................... 9
Figure 4 – Lift and remove the substage condenser carrier ................................................................................................... 9
Figure 5 – Substage condenser carrier removed .................................................................................................................... 9
Figure 6 – Protect the field lens with a dust cap..................................................................................................................... 9
Figure 7 – Remove the rear cover from the pillar arm ......................................................................................................... 10
Figure 8 – Remove screws and washers holding gearbox .................................................................................................... 10
Figure 9 – Remove the loose gearbox and the brass shims .................................................................................................. 10
Figure 10 – Remove the top screw holding the focus rack ................................................................................................... 10
Figure 11 – Remove bottom screw holding the focus rack .................................................................................................. 11
Figure 12 – Remove the brass focus rack ............................................................................................................................. 11