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Creighton
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« Reply #10 on: December 23, 2005, 10:25:58 pm » |
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Ken,
~6amps pull is around what I see with a RT-V56. JohnieG will know what to do for fixing the Coinco.
Creighton
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johnieG
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« Reply #11 on: December 23, 2005, 11:26:46 pm » |
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| Quote (bubba @ Dec. 23 2005,9:08) | Well, I fired up my vendo 63, and the changer is not working.. I started probing around with my meter a bit.. What is the voltage out of the transformer? I'm not getting anything on the output of the transformer, according to the pinout on the diagram. There are some burn marks on the back of the logic board, and one of the caps on the other side of the board is getting hot by the trace. I don't know if the board has been repaired previously, buy my guess is that it has. I'm not quite sure where to start with this. It looks pretty basic and I can probably figure it out. I don't want to start dissasembling the back cover until I know whats in there... does anyone have a manual or any info on the S75-9800A changer?
The panel lights up, the compressor works, and this thing is like an ice cube machine. The door light is out, but the bulb looks black, so I'm sure its shot. I did trip the GCI outlet in my basement, but I thought this machine only is supposed to draw ~6amps.... |
If the mech is dead (no functions whatsoever) & the transformer is open ( it should have 12volts AC on the output side) & the traces (etched copper traces) are burnt & lifted off the board, then sad to say, it's time for a new 'mech.
I can walk you through the failure & you can see if you can replace the damaged components, but chances are it's "toast" so, you can find a "doner" coinmech with a damaged plastic body to swap out the transformer & logic board into your "guts" or you can just buy another one to replace it...
1). As the mech ages the main filter capacitor starts to dry out,this causes excessive A.C ripple on the D.C. side of the logic circut. this cause the coin logic chip to malfunction, miscounting accepted coins & usually causing a "over the top" vending price ( it ignores the vending/price switches), or it ignores a properly accepted coin signal from the coin switches, (typically the quarter circut seems to go first)
2). this ripple voltage also starts to cause errors in coin acceptance ( wrong change given back, won't count the correct amount for coins accepted, & the change motor starts to "ghost" giving back nickels even when the correct amount of coins has been inserted/accepted by the mech).
3). the dryed out capacitor starts to draw too much current form the Zener diode, which in turn starts to "toast" the big load restistor on the PCB next to the capacitor
4). this causes futher damage to the capacitor, which eventually fails, but not before shorting out & overheating the copper traces, causing them to lift off of the board...
5). By now the zener diode/voltage regulator has had enough & also fries, which causes too much current to be drawm from the transformer & "pops" the built in over temp/current protector ( a one-time safety fuse built into the windings of the transformer) & the mech dies...
sad isn't it?  '> |
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Spoon-feeding Newbies since 2001...  Yeah..220,221 whatever it takes. Remember, all it needs is a shot of Freon! The Vendo V-83 is the '59 Edsel of the coke machine world. ;p Spray painting does NOT restore a compressor 11 is louder than 10... "Hope" is good, but it's not an action plan. |
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bubba
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« Reply #12 on: December 24, 2005, 08:47:45 am » |
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Wow... it is very sad.... It doesn't sound like its worth trying to repair the board then.. I have one trace that has copper showing for about an inch, but has continuity across both sides. I couldn't see how to get the logic board off the plastic. I also could not find the spot where the dip switches are to select the money..
Well, do you or anyone have a changer they'd like to part with? I've seen a few on ebay, but figured I start in house first...
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Ken
V-63 -Bottles
2-Cavalier USS-64
VMC ST56B Royal Crown - being built
Vendo HA56C Coke
2-V63C DP
V63C Coke
U-Select-It 5cent candybar machine
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Skeleton Man
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« Reply #13 on: December 24, 2005, 07:14:37 pm » |
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That's probably what happened to my 9800A changer.. I'll check the transformer coz the AC side works (crems click), but no DC (no coins accepted, inventory motors don't run)
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Skeleton Man
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« Reply #15 on: December 30, 2005, 05:38:17 pm » |
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Correct me if I'm wrong.. but it looks like the diode is burnt out.. mine was exactly the same, but replacing the diode didn't help at all.. also that copper part is a fuse.. (if it blows you can solder a strip of wire across there)
I gave up on mine and bought a new changer..
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bubba
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« Reply #16 on: December 30, 2005, 06:18:59 pm » |
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I don't think thats a diode, is it? I thought it was a capacitor, but I can't make out any #'s on it. The leads coming out of it are a bigger diameter than most electronics parts I've replaced, so I'm not sure what the heck it is. I just got a new changer, and the machine is working,but I love to tinker with stuff, so I'm gonna give it a shot to repair it. Its broken anyway, so I can't make it much worse. I get continuity across the copper trace, so IMHO its still a good circuit. Atleast now I have a working unit to compare with.
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Ken
V-63 -Bottles
2-Cavalier USS-64
VMC ST56B Royal Crown - being built
Vendo HA56C Coke
2-V63C DP
V63C Coke
U-Select-It 5cent candybar machine
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johnieG
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« Reply #17 on: December 30, 2005, 06:35:38 pm » |
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| Quote (bubba @ Dec. 30 2005,6:18) | | I don't think thats a diode, is it? I thought it was a capacitor, but I can't make out any #'s on it. The leads coming out of it are a bigger diameter than most electronics parts I've replaced, so I'm not sure what the heck it is. I just got a new changer, and the machine is working,but I love to tinker with stuff, so I'm gonna give it a shot to repair it. Its broken anyway, so I can't make it much worse. I get continuity across the copper trace, so IMHO its still a good circuit. Atleast now I have a working unit to compare with. |
it's a 12volt, 1/2 watt Zener diode (voltage regulator) not a capacitor, if it's too far gone, ( kinda looks like yours is past its prime) then it takes out the CPU with itself, the the board is "toast". you can try to replace it, but don't be surprised if the whole board goes "snap" "crackle" "pop" when you fire it back up!  |
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Spoon-feeding Newbies since 2001... Yeah..220,221 whatever it takes. Remember, all it needs is a shot of Freon! The Vendo V-83 is the '59 Edsel of the coke machine world. ;p Spray painting does NOT restore a compressor 11 is louder than 10... "Hope" is good, but it's not an action plan. |
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bubba
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« Reply #18 on: December 30, 2005, 08:50:43 pm » |
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Thanks, Johnnie.. What the heck.. I'm gonna pick one up next time I do a parts order and see what happens. I'm pretty good at letting smoke out of electronics, so this should be right up my alley 
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Ken
V-63 -Bottles
2-Cavalier USS-64
VMC ST56B Royal Crown - being built
Vendo HA56C Coke
2-V63C DP
V63C Coke
U-Select-It 5cent candybar machine
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johnieG
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« Reply #19 on: December 30, 2005, 09:08:08 pm » |
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Just make sure the replacement is installed correctly with the polarity strip (if you can still see it) pointing in the same direction as the original, cut one end of the old ones wire, & gently look underneath, that side hopfully should still be visable, you're looking for a white/silver strip of paint that marks the negative end of the Zener diode, here's a basic diagram showing the transformers location on the Coinco 9800 series coinmech chassis...
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Spoon-feeding Newbies since 2001... Yeah..220,221 whatever it takes. Remember, all it needs is a shot of Freon! The Vendo V-83 is the '59 Edsel of the coke machine world. ;p Spray painting does NOT restore a compressor 11 is louder than 10... "Hope" is good, but it's not an action plan. |
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