Alps rotary encoder ID help

[sudont]

I've searched online for info and still no idea what kind of encoder this is.
It's labeled Alps 811c / 631c, and it's from the late 80s
I'm trying to find a replacement, but am stumped.

Any help would be greatly appreciated

[sudont]

My guess was that it's mechanical and presumably capacitive?, but I've found no such thing exists on digikey.
 

[mikerj]

If it's a normal mechanical contact style encoder there should be plenty of choice for modern replacements, especially as it's wired rather than PCB mounted.  How many pulses per revolution does it have?

[sudont]

I counted around 48-50, and tried googling for said and nothing came up.
Any further help would be greatly appreciated, thanks

[madires]

Detents? If yes, how many?

[Ario]

I would try googling the product it came out of?

[free_electron]

custom job. Alps does many of those. almost all the combo potentiometers / encoder in car radios are Alps custom jobbo's

[Audiorepair]

Buy a bog standard rotary encoder, they all work the same and are really cheap.

http://www.farnell.com/datasheets/1837002.pdf?_ga=2.91571290.1764911387.1599678160-1771980843.1483642398&_gac=1.82231012.1599244606.Cj0KCQjwy8f6BRC7ARIsAPIXOjiAduvn9NAj5Ik0rGDp3u43Ww4Q0rjFBeeDwYnXOKyW2GQUczDMzwMaAo9aEALw_wcB

If you establish that this works as expected bodged into your circuit, then you just need to find a modern one that will fit and looks the part.
(If it works backwards, you just need to swap 2 pin connections over)

[mikerj]

I counted around 48-50, and tried googling for said and nothing came up.
Any further help would be greatly appreciated, thanks

That is quite high for a contact based encoder, I can see why you are struggling to find anything.  Does the pulses per revolution actually matter e.g. is there a scale on a panel that the knob aligns with?  Grayhill make a 36PPR encoder with detents.

[sudont]

Detents? If yes, how many?

Yes it has detents, via a ballbearing, I'll count them tomorrow and get back to you, thanks.

[sudont]

I would try googling the product it came out of?

I tried, but it's a rare piece of gear, can't even get the service manual on it.

Buy a bog standard rotary encoder, they all work the same and are really cheap.

http://www.farnell.com/datasheets/1837002.pdf?_ga=2.91571290.1764911387.1599678160-1771980843.1483642398&_gac=1.82231012.1599244606.Cj0KCQjwy8f6BRC7ARIsAPIXOjiAduvn9NAj5Ik0rGDp3u43Ww4Q0rjFBeeDwYnXOKyW2GQUczDMzwMaAo9aEALw_wcB

If you establish that this works as expected bodged into your circuit, then you just need to find a modern one that will fit and looks the part.
(If it works backwards, you just need to swap 2 pin connections over)

Thank's for the help, I'll check the datasheet tomorrow to see, I already have a bog standard rotary encoder I can try with it, it's just the switch mode PSU is failing and needs recapping before doing more testing.

[sudont]

It has exactly 50 detents, which I'm guessing should match the pulses per revolution?

[madires]

Earlier you've mentioned that you've counted about 50 pulses per revolution. Was that just for the A (or B) pin or for both? 50 pulses on one pin would mean two Gray code steps per detent. In that case you could try an encoder from the ALPS EC11 series (one with 30 detents).

[sudont]

A, and b pins are mirrored, so it's about 50 pulses per pin, so yes you're right 'two gray code steps per detent"
New terms for me,i appreciate the help on this, I'll check out that encoder you recommend, thanks again.

[sudont]

Just to conclude the OP, I ended up using tweezers etc to try my best to straighten the contacts inside the encoder..
and although the tests with multi meter showed strange readings, the original encoder works perfectly again.
Thanks for all the input on this