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USI 3508 issue


jerry1973
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Hey, I have a 3508 snack machine that is doing something that I haven't dealt with before. Every selection that ends with 3 will not vend or test vend (13, 23, 33, 43 and 53). I know its not the key pad because all of the selections that begin with 3 all vend perfectly. When I just thought i was dealing with one bad selection I swapped motors with another position and the problem persisted even with a different motor. I'm a little stumped, any ideas?

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Luckily the account isn't super worried about those selections at the moment, I do however try and keep things operational at all times. I revisited the machine and noticed that every selection ending in "3" had a green wire with a white stripe. This wire is bundled into the harness coming from the bottom shelf and ends up plugging into the control board. I swapped motors on each selection that ended in 3 and inspected each shelf for broken or damaged green/white wires and made sure each of the terminals was pushed in deep enough in their respective harness plugs.  My next step will be to test continuity on the green/white wire where it plugs into the board and ending at each of the 3 ending motors. If there is continuity at each of those I would then suspect that the control board would be the culprit. I do have a second identical machine at this location, and if the wires do test good, I think I might temporarily swap the boards to see if that makes everything better. Do any of you see any issue with my logic with this problem? This has been a very strange issue that I have never dealt with. 

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  • 3 weeks later...

so it was a wire broke. The ziptie that they used at the factory was so tight that it caused the wire to bend too sharply every time the drawer was pulled out. Anyway, the wire broke so close to the plug that i can't fix the break. Anyone know where to get a plug/pigtail like this one? I will have to upload the pics individually since there is a file size limit

dixie4.jpg

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