Reel optical sensor

[CCHA]

I’m new to this industry and just bought my first machine.
Been doing a lot of reading trying to figure out a problem with my machine.
I’ve narrowed it down to the stepper motor or the optical reel sensor.
I tried to replace the reel sensor with the door sensor to see if that would work but it didn’t.
the reel sensor has a number on it, 505N.
the door sensor looks the same but the number on it is 531N.
does anyone know if these two sensors would be interchangeable or where I can find the correct sensor?
the machine is an older Olympia Joker.
Thanks for any help.

[Drunkenclam]

Is there an indicator light on the main board to tell you if something is active.

Without looking up the datasets. I can't tell you if they are the same. It would have made more sense to test with a sensor out of another reel and see if the fault stays with the same reel with the same motor. Or the fault went to the reel with the swapped sensor.

[CCHA]

There are no lights on the main board.
I will try swapping reel sensors and see.
Thanks for your reply.

[CCHA]

I tried as you suggested and determined the stepper motor is the problem.
I have one ordered and it should be here by Saturday.
Thanks for all your help.