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So thanks to everyone on this board who replied, I successfully swapped out the main power cable last night.  After one false start (tripped the GFI outlet) I was able to get it powered on.   

The great news is that it started right up and the compressor runs very nice and quiet.  After about an hour the internal temp went from 80* to 42*.   The Sold Out light lit up and when I depressed the switch on the back side of the main door, it went out.   The exact change light (aka "nickel tube light") lit.   I filled the nickel tube part way and that light went out so, good news there as well.

Next, I held down the switch on the back of the door and dropped a dime in the coin mech.  After a second or two, the rollers that control the bottles moved over one position - so even more good news! 

Unfortunately... that's it.  It appears as though it did not complete the vend cycle fully and reset.  Now neither light is lit, with or without the switches being depressed, and the coin mech is rejecting any addtional coins.  Power is still good to the unit, it is cooling - fans are running and the pay-out switch on the nickel tube is working.

Any thoughts on the next troubleshooting steps?  I noticed that there is a switch in the door that covers the chute so I depressed that, but no change in state.  I've also tried power cycling everything (reboot..heh) with no success.    I suspect that switch (in the bottle chute) may be the key - I presume from reading the manual that is what completes the vend cycle.  It does not look easily to access - I think I have to remove the liner to get to it, but I'm not 100% sure.  The manual states to "reach through and remove 2 screws" but there are no diagrams, so I'm not sure where those mysterious screws are located.

So...any suggestions guys?

Thanks!
Jim

       My Vendo 80 has an access plate above the bottle door chute.

Hi Glen,
I have a panel/plate above the door, but it appears to be be riveted in place:

      Those are snap-in plugs. They will pry out and are reusable.

Awesome - thanks!   A prying I will go!  Will report back shortly.  Thanks again Glen!

OK, thanks again Glen - I was able to pop out the plugs and test the switch.  Unfortunately, it is working fine.  It is NC and opens when the switch is depressed. 

Interesting - both green wires are on one terminal so I'm not sure how the switch is actually working, but it appears to have been wired that way for quite some time so I'm not sure I want to mess with it, particularly since it did work for one vend cycle.

Time to revisit the manual and work backwards through the vend cycle.  The coin mech has a lot of paint overspray on it, so it might be worth having it gone through regardless.

     The switch must have been bypassed. One wire goes to each terminal.

Interesting - not sure why anyone would bypass it, but I re-wired it correctly.  Still no results, but I feel better knowing it is wired correctly now.

I'd like to test the coin mech - and I apologize if this is a real newbie question - but can I take any coin mech that has the 8-pin Jones plug and use it for testing?  I have a coinco that works perfectly in my Cav 96, if I could swap it for testing it would eliminate or point to the mech as the culprit.

Thanks guys!

       Yes, use your coinco.

Awesome, thanks!  I'll give that a shot tonight when I get home. Thanks!  (yet again!)

OK - here's what I know after another round of testing. 

I still have no lights (sold out or exact change) on the V-80 after a single vend cycle during initial testing.

1) I have line voltage to pins 1-2 on the Jones socket on the V80 (verified with my DVM)
2) If I jump 1+3 on the Jones socket, I hear a click from the vend relay immediately below the Jones socket but nothing else.
3) When I plug my known-good Coinco mech into the Jones socket on the V80, I get nothing.  Usually I will get a click as the CREM is energized.
4) Plugging the mech from the V80 into my CS-96 I get the familiar click of the CREM and the "exact change" light will light on the CS-96.

 So...any thoughts?   It sounds like I'm not getting power to the CREM, but I'm not sure which direction to go.  Looking at the vend-cycle diagram, I'm thinking maybe I need to find the vend motor Cam switch and see if that is functioning correctly.  I don't see a physical location for this switch in the manual - can someone point me toward it, or provide additional suggestions?

Thanks!
Jim

I got it!     :happydrinkers:
   
I located the cam switch and pressed it with a long screwdriver.  The vend motor moved about 1 chain link and everything lit back up!   I ran it through another vend cycle and it stopped again - so again with the long screwdriver it moved another link or so and everything came back on.   After that - I ran it completely through an entire series of cycles (moved the rollers from left to right and back) and it is now working fine without any assistance!   I lubed up all the rollers and the chain and as I ran it through more cycles it got much smoother with the rollers and the movement.

So now I can work more on cleaning and polishing tomorrow and it should be ready to bring into the house to take it's place alongside my Cav CS-96e !

Woo-hoooooo!!!!!

Nice work!  Good to know it was just a little gummed up and there was no bigger problem

Nice job Jim...you're far from a newbie now! Way to go!

Nice to know members on here like Mondawg reach out to help fellow members with their questions!

Awesome hobby!

Thanks Bob,  I think I'm still a newbie to this hobby but my collection is growing on a weekly basis it seems.   I love the elegant simplicity of these things. 

Everything is switches and motors, no ICs or optics.   (and I'm an IT Director)

...and yes, BIG thanks to Moondawg for his help.    :happydrinkers:   

You guys are the best!