Electrical difference between nri and coinco?

[joesquid]

I've got a Vendo 80 that works perfectly with my NRI model 7700 changer (single price $.10).  I've tried plugging 4 separate COINCO S75-9800 changers and can't get any of them to vend.  They're all set for $.10.  The NRI vends fine on a dime but none of the COINCOs will.  The dime is accepted but nothing happens.  Is there a fundamental difference in the electrical design between NRI and COINCO changers?  Does the Jones plug (female side) need to be rewired to operate correctly with COINCO changers?
Thanks!

[Jim]

Eric,

This may sound silly and unlikey, but you're sure all four Coinco mechs are functioning fine...?

I don't recall these  earlier electric mechs operating at different voltages etc, so I'll have to do a little research and get back to you over the weekend unless someone comes up with something before then...
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[joesquid]

Three of the COINCO units were questionable, but the last was known good.  The thing I hate about the COINCOs is that they incorporated a logic board but don't provide a schematic showing logic paths.  In any electric changer, the key signal needed to start the vending cycle is the momentary actuation of the vend switch.  On NRI changers, the switch is connected between pins 1 and 3 on the male Jones plug.  I don't know if that's the case with COINCOs because the schematic isn't complete.  It shows connection points to and from the logic board but not the path within the board's circuitry.