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Coinco coin changer Logic Board

rudy25

Nov 30, 2013
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Hi, just signed up, I am trying to repair a Coinco Lower Logic Board P/No 903037 rev 7 and there is a zener diode marked DZ7 609 for which I can find no info, is it 9 volts? supply to board is 18v ac then via a bridge rectifier and zener to the board's circuitry.
I am also trying to draw a schematic but am getting a headache, anyone out there have a schematic already?
The coin changer is out of a Dixie Narco vending machine, the whole coin changer is S75-9800A and the repair manual (available online) was printed July 1988 but does not go into circuit board level.
Help would be most welcome
PS I posted this in Manuals and schematics but Forum advice was to post it here so now it's in twice:confused:
 

davenn

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Sep 5, 2009
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Coinco Lower Logic Board P/No 903037 rev 7 ..... I dunno what one of those is ??

maybe some pics would help us guys help you (sharp and well lit)

I will delete the other post for you

cheers
Dave
 

rudy25

Nov 30, 2013
3
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Nov 30, 2013
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Coinco coin changer

Hi Dave, thanks for the response, the photo I'm sending has the back of the pcb superimposed so I can trace the circuit better but the big diode in the bottom right hand corner is where the zener should be, somebody said try that but luckily nothing blew up, I hope the photo is not too big as it's blown up a fair bit, I would have put the zener back in but haven't had time, maybe it's still good (I didn't take it out so maybe just the solder joints were burned a bit too much.
Meanwhile here we go.
Cheers ... Rudy
 

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rudy25

Nov 30, 2013
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Hi Davenn, picked up from a forum dedicated to vending machines that the zener is 12 volts and I presume 5 watts.
I tested the zener with two 9 volt batteries in series and a 1K resistor and it proved OK, found that the thermal fuse hidden under the transformer that supplies 18 volts to the circuit board (from 110 volt supply) had blown, put in a new one (119 deg C) and that fixed the whole machine (it's there to blow if there is a serious jam up and the transformer gets hot and it works!).
Thanks again for your attention
 

davenn

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Sep 5, 2009
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no probs
I couldnt really help too much on that one
not something Im familiar with working with

pleased you have had success :)

cheers
Dave
 
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