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A coupla months ago I created a post about my inability to get a Lionel  2037 steamer to run. I mentioned checking the E unit with an ohm meter etc. and despite it checking out OK I could NOT get the engine to run. I had the e unit apart a few times and cleaned everything - checking and re-checking and could find nothing wrong. I knew the motor was fine.

I re-addressed this engine last week and this time I took a can of De-Oxit D-5 electronic cleaner (I buy this stuff by the case for my Hi-Fi business) and gave a tiny shot to the electrical parts of the E unit. The engine sprang to life! Everything clicks like new and it never misses a cycle! The engine runs strong and smooth. All due to a shot of De-Oxit.

I had a friend over the house the other day who is an electrical guy in fact he is a senior manager with the LIRR. I mentioned this to him and he tells me that once in a while they run into a similar anomaly at the railroad where they will have some switch point that will show continuity with an ohm meter but will not pass current! The moment they clean it it works fine. 

All I know is I have been in the electronics business for 40+ years and never experienced anything like this before. I have been using De-Oxit for many years. In fact due to my promotion of De-Oxit in my business dealings a manager from the company (Caig) once called me to discus how I use it. As far as I am concerned it is the best electronics cleaner there is. It has never ever attacked chassis lettering or caused any issue of any kind AND it LASTS. Cleaned stuff stays clean. It will also act as a gentle lubricant and will evaporate leaving a protective coating.

For what its worth!

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I use the small brush bottles of red and gold for train stuff.  I, too, have gone through many cans and bottles with my tube audio equipment. There is no better cleaner/contact enhancer than the Caig products.

fisherdoc helped me years ago on a vintage Fisher integrated amp! He knows Fisher tube equipment better than anyone else!



Last edited by Geary

When you use an ohm meter,  you are applying the probes to the places you want to measure, and the pressure you apply can actually cause the probes to "cut through" a very thin non-conductive film. Besides pressure, the probe "scratch" through a very thin non-conductive film to make good contact, giving you a near 0 ohm reading, but the film is not actually cleaned off for operational contact. Hence, the tuner cleaner removes the film and all is well.

I have found the best way to check an eunit drum is connect a light bulb to the two yellow wires, or on newer units, the yellow and blue wires. Then connect power to light the lamp to the black and green wires. Each time the eunit is cycled the lamp should cycle on and off. If this is not happening, or if the lamp flickers, the fingers or drum need attention.   The lamp will draw enough power to give a better indication than can be had with a meter.

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