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The fine knob on my MRJ-03 is loose and keeps spinning even after i stop touching it. How can i fix this?

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There is what is called a "stage stop" screw. Its purpose is to limit the specimen from rising high enough to contact the objective lens. The "stage stop" screw is directly behind the black stage platform in plain sight and very easy to access. It is a thumb screw and sits vertically. Simply loosen it a bit to allow the specimen to rise high enough to focus.

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The roller that spins with little brushes stopped suddenly and no longer spins. I pressed the red little knob at the end of the roller but it doesn't fix the problem.


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1 Answer

I own a MRJ-03 Premiere microscope with the a bad electric board. How can I get spare parts for it? abnernm@hotmail.com


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Robbie.Dietrich@gmail.com

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3 Answers

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Spinning is caused by one of the main propellers rotating faster than the other. If both propellers are secured tightly to their drive shafts, the spin control knob on the remote control can be used to stop the spin. However, if one prop is slipping with respect to the other, the spin control knob will not fix the problem.
I've found that the set screws holding the propellers to the drive shafts tend to loosen after a while. If one prop is a bit loose and the other is tight, the relative slippage will cause the helicopter to spin.
To check, turn off helicopter power and manually rotate each propeller separately, watching the nylon gears in the body. If the propeller is moving and its drive shaft gear isn't, the propeller is slipping because its set screws are not applying enough pressure on the propeller's drive shaft.
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