AP 213 coffee mch not dispensing cups?

[help]

I'm wondering if someone can't point me in the direction of diagnosing issues with a 213 coffee mch not dispensing small cups. I checked the obvious. Cups are full and no jams. Large cups dispense fine. What are the most common causes of this type of issue and where best is it to start diagnosing? Thanks

[cvending]

Does it try to dispense the cup? Does the cup motor run at all?  Was it working previously?

[Vendo Mike]

I think the AP213 had a separate test to operate the cup solenoid.  Is there an error when it doesn't dispense?

[AZVendor]

There is a cup drop test to see if the motor moves.  They usually do and I've never seen a cup motor go bad but they are about 25 years old now.  Otherwise, cup drop problems are due to incorrectly sized cups or rather, incorrectly set cup rings.  These cup rings can't be stocked willy nilly with just any cup you choose to put in it.  The cup ring always has to match the cup you use so you should always buy the same cups each time to avoid problems.

To adjust the cup ring you will loosen the adjustment lever on the outside of the ring and put just one cup into the ring.  You want to adjust the ring so that the white cup pawls extend into the ring just far enough to hold the rim of the cup but not so tight that the cup is held tight in the ring.  Once it's adjusted then test the cup by pulling on it a bit to see if it falls out or can easily be pulled out from below.  If so then adjust it just a bit tighter so that the cup moves and spins but isn't tight in the ring.  Then lock the ring adjuster down and put a short stack in to test through the test function.  If the cups don't drop then adjust the ring again.  You also need to make sure the rims of any cups aren't damaged.  If they are then throw them away.

[cvending]

My earlier post was to determine if the cup empty switch was being held closed.  If it thinks it is out of cups it will not vend that size cup.