February 16, 2014
Olympus BH-2
The light on this BH-2 microscope would not illuminate. We replaced the bulb to ensure that the bulb was not the problem. We took the base apart and found that the connection for the collector connection of the power transistor was loose. I unsoldered it, cut and stripped the wire, and resoldered it. After testing the microscope, the light still would not illuminate. We replaced the power transistor (ECG 280) because we had that part on hand. That did not fix the problem either. We tested for voltage at various points of the circuit and they all seemed to be accurate. We found that the voltage at the light socket was 7-8 volts with no load and once the light bulb was inserted the voltage dropped to 0. We tested the other 2 transistors in the circuit and one of them tested bad. It was replaced with a NTE298. Once the microscope was put back together, the light illuminated. Once the microscope was fixed, I cleaned all the lenses on the microscope, cleaned the diaphragm and stage, and aligned the condenser. I also completed an electrical safety check and then returned the microscope to service.
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Calibration of E-CAiO CO2 Gas Module
I used the Datex Ohmeda calibration gas tank to calibrate the CO2 module. The tank contains a certain percentage oxygen, carbon dioxide, nitrous oxide, and desflurane. Once the CO2 module reads the gas in the tank, it will display what it reads. Over time, the machine may drift out of calibration. When the airway gas calibration screen updates, the proper adjustments can be made. Then verification can be made by running the gas through the module to ensure that the numbers match up.
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