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Scrapped an Epson NX300

bigone5500

Apr 9, 2014
712
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Apr 9, 2014
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712
Got some pretty good stuff ... I think ... from this one. 30 tactile switches for one, two stepper motors which are kinda cheapy looking. Small and flat. Two regular motors. Various electrolytic and ceramic type caps. A power supply that I haven't tested to see what voltage it puts out. And some sore fingers.

Now to research those steppers and see if I can make one work.
 

bigone5500

Apr 9, 2014
712
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Apr 9, 2014
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712
Well I tested the power supply and have determined that it is no good to me at 42 vdc. And for the life of me I can't find any information on the small 'pancake' steppers I salvaged. The numbers on them are Em-558 801A935T, and the other one is EM-553-8Y25AR2.

I took the first one and marked it then counted the steps/rev and got 48 which is 7.5 deg/step. This one, when turned by hand has more 'resistance' to the steps than the other one.

Has anyone came across these steppers before? Is there a standard or generic way to drive these with a stepper controller?
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
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Jan 21, 2010
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25,510
Simple questions first.

How many wires do they have?

How are these arranged?

For stepper motors you may have two pairs of separate windings, two pairs of separate windings with centre taps, or two windings with centre taps that are joined together. (The last one can be a bit of a pig to fully identify)

These should be contrasted with a device having three separate windings, or three windings with a common connection to one end (wye), or even three windings that are joined in series in a loop (delta).
 

bigone5500

Apr 9, 2014
712
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Apr 9, 2014
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712
Haven't gotten to it yet. Will post photos tomorrow and measurements on the motor leads.
 

bigone5500

Apr 9, 2014
712
Joined
Apr 9, 2014
Messages
712
The resistance of the leads is: black and brown - 20 ohms; yellow and orange - 20 ohms.

tmp_17566-20140915_211449-847123380.jpg tmp_17566-20140915_211411565494242.jpg
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
Joined
Jan 21, 2010
Messages
25,510
You probably need to cycle it something like this:

Red=-+ve, Brown=-ve, Yellow=0, Orange=0
Red=0, Brown=0, Yellow=+ve, Orange=-ve
Red=--ve, Brown=+ve, Yellow=0, Orange=0
Red=0, Brown=0, Yellow=-ve, Orange=+ve

If it does nothing (except shake) then swap over one of the leads.
 
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