Need Help My ol' Roland SP-540v can't sense the left pinch roller. What kind of sensor is involved?

[crgrove]

HI THERE, EVERYONE!
My ol' Roland SP-540v can't sense the LEFT pinch roller. The carriage just skips right by it. going all the way over to the left side and returns to the station. It says "invalid" left pinch roller position BUT IT IS DEFINITELY right smack dab in the middle of where it's supposed to be.
I might be able to figure it out if I even knew what the mechanism is involved in doing the sensing. Is it magnetic? ...optical?... magic‽‽‽‽
I have the service manual but danged if I could find any info anywhere!
Thank you for any help you can give.

 

[cornholio]

This is most likely the flat cable going to the cutting head. It's a optical sensor on the back of the tool carriage.

 

[crgrove]

This is most likely the flat cable going to the cutting head. It's a optical sensor on the back of the tool carriage.

Thank you... I'll check it out!

 

[crgrove]

This is most likely the flat cable going to the cutting head. It's a optical sensor on the back of the tool carriage.

I dug down into the little board on top of the carriage... wiggled the cable in its connector... and viola! I'm back!!!
Thanks again for the suggestion!

 

[netsol]

I dug down into the little board on top of the carriage... wiggled the cable in its connector... and viola! I'm back!!!
Thanks again for the suggestion!

do yourself a favor & order the cable.
better you have it, next time it acts up (AND IT WILL)