Dave,

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That part number is obsolete it seems, looking at DigiKey.

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It appears the HEDS-9100 series is the appropriate replacement for the electronic module but check the data sheet at DigiKey for pinout and mechanical fit.

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DigiKey doesn’t seem to stock the 256-line incremental codewheel itself if that is what you need. They have a minimum order of 300 (!). Same for Mouser. Usually the electronics is what fails hard but if the hub fails on a codewheel it can get mangled.

If you do really need a codewheel you might try Components-Center dot com. And make a special request for just a couple of units if you do need a codewheel.

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Or try US Diigital directly. You maybe able to order the complete kit (encoder electronics and code wheel) from US Digital. But again read the data sheets. I had to order one of theirs to replace an encoder on a Celestron for a friend. The pinout order was the same but the connector size was different. Not cheap for a single unit from US Digital but they do give good service.

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You may not be able to find the bore for your shaft but you can order one with a larger bore and then make/buy a little bushing pretty easily.

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By the way, have you tried cleaning (distilled water only) and re-gaping the codewheel? I’ve had to do that more than once in my life. But the electronics (usually the LED) do fail. You can usually see a signal on one channel but not the other when that happens.

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Best wishes,

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Mark Christensen

Dave,

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You might also try Mall-IC dot com and ask for a single unit price.

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Mark C.

Code wheel is undamaged and clean (it’s a US Digital one not an Avago (Broadcom) one).? The sensor inside the unit is definitely a HEDS-9100 which I’ve ordered a replacement for.

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Dave