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DCS thumb wheel replacement question

J jini5OGR Forum Member SUPPORTING MEMBER

I replaced my DCS handheld thumbwheel assembly this morning. The cradle was the broken part. I ended up replacing the whole assembly. I do have seperate cradles on hand. So after I replaced the whole assembly and got it working, I decided to try to replace my original thumbwheel cradle. To remove the thumbwheel and switch from the cradle, it is necessary to unsolder the base plate from the switch. I did that and reassembled the thumbwheel into the cradle. Then I resoldered the board/wire connections back onto the switch. What I need to know is.....Is there a way to test this switch with a continuity meter? I assume yellow is common? So I use the audio feature of my continuity meter. Meter leads between yellow/red spin wheel and get audio at every click of the thumbwheel. But I get audio while spinning the thumbwheel either direction. I am thinking that I should only get audio in 1 direction. Any input from the MTH Gurus? Thanks

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gunrunnerjohngunrunnerjohnOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

It's a mechanical contact encoder, so you will get continuity in each direction.  As long as you soldered the board back on right, just assume it's working unless you want to work out the details of the encoding.

The way it determines direction is there are two sets of contacts, hence the three wires.  The order in which the contacts close tells the remote which way the wheel is spinning.

A fun fact:  The reason that sometimes you see the speed go backwards to the wheel spin is apparently the microprocessor and/or the coding of same isn't fast enough to properly determine the wheel direction.  I always thought it was the contacts themselves, but someone clued me in.

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