1 Begin: Microscope Begin diagnostic process for a work order for Microscope. Maintenance is generally requested on a microscope when a specimen cannot be viewed clearly or at all.
2 Does the microscope power on when plugged in? When plugged in, the microscope should power on completely.
3 Troubleshoot power supply (separate chart). If no power reaches the machine, there may be problems with the switch, fuse, power supply components, or wiring. See flowchart on Power Supply and BTA skills on Power Supply.
4 Does the light source turn on and stay on? The light source should remain constant across the stage when on.
5 Does the light turn on and flicker? If the light turns on but does not remain constant, there may be a minor problem that can be fixed without replacing the bulb completely.
6 Ensure contact is clean and secure any loose connection. The inside of the lamp house or the connections may be dirty. The connections should also be secured firmly. See BTA skills for Connections.
7 Is resistance at each end of the filament 0 ohms? This checks if the filament in the bulb is functioning.
8 Check internal circuitry, dimmer knob, or diaphragm, if applicable. Ensure that the circuitry that connects to the light source is intact. In addition, ensure the dimmer knob is turned on and that the diaphragm is open.
9 Replace bulb with same type of bulb. If the light source still does not turn on, replace the bulb with another of the same type. If the same type of bulb is not available, a new source can be wired in. See BTA skills on Replacement of Light Bulbs and Light Fixtures. 10 Go to begin. Restart the diagnostic process.
11 Focus the microscope at the lowest objective. Begin this portion of the diagnostic process at the lowest objective.
12 Can the specimen be viewed clearly? If the specimen is out of focus or cannot be viewed at all, the objectives may need attention.
13 Clean dirty objective using a soft brush, a lint-‐free cloth, and lens cleaner.
Objectives can be unscrewed or removed for cleaning. Unscrew eyepiece to use as a magnifying glass if one is not available to inspect objective for scratches, nicks, cracks, deterioration of seal around lens or oil seepage into lens. Blow off any dust with canned air before cleaning. Start cleaning objective lens from
14 Do the mechanical adjustment knobs turn easily? The knobs and stage should be able to move freely and also maintain a steady position. The screws holding each in place may need some adjustment.
15 Ensure the correct amount of lubricant has been used.
16 Ensure the microscope is covered to avoid dust settling on it. When covering the microscope, put a small amount of uncooked rice to prevent fungal growth. Replace uncooked rice weekly. 17 Microscope is working properly. Return the machine to the appropriate clinical personnel.