Coinco S75-CONV Coin Acceptor Dip switch settings

[Coke536]

My Cavalier USS-8-64 has a Coinco coin mech which is labeled S75-CONV or CONY, but looks similar to the S75-9800 series.  I'm trying to set the price to $1.00 per vend, but no matter what I set the dip switches at, it vends for a different amount.  I've tried various switch settings, but they doesn't seem to be a pattern.

Has anyone else seen this and know whether it can be fixed or whether I need a new circuit board?  I've flipped the switches back in forth to loosen them up and they seems to work OK.  Is there some testing I can do with a continuity tester on the circuit board?

For example, here's the five switch settings and their value:

1      2     3    4     5
.05  .10  .20  .40  .60

ON  ON ON    ON   OFF  - should vend at .75, but the machine vends at .45

ON  ON  OFF  OFF ON  - should vend at .75, but the machine vends at .90

OFF OFF  OFF ON ON  - should vend at 1.00, but the machine vends at .30

Thanks!

Found this post a few minutes after post.  Sound like the electronics could be shot on my coin mech.  http://soda-machines.com/discussions/index.php/topic,3490.msg23090.html#msg23090

[MoonDawg]

      Left to right value always doubles, switch #5 should be .80

[johnieG]

The "Conv." stands for Converted, it's an early version of the S75-9800 with a die-cast metal main body, most of these earlier single price models couldn't be set above 75-cents. (similar to the S75-9800/A plastic bodied models) even if there is a fifth dip-switch, it has no function on the older CPU board.