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| SirPeale:
--- Quote from: grantspain on May 29, 2008, 03:26:09 pm ---sounds like the 50p line is short,unplug the coin mech only so you leave the credit board still connected then fire up the machine,if you still get 5 credits then most likely the credit board is faulty --- End quote --- He's not getting five credits, he's getting "5", which is the Mame keystroke for left coin switch. I agree with the first part of that though...unplug the mech and see if it still does it. I'm betting it does. |
| grantspain:
oh i see,the actual number 5 as a switch stuck on |
| Neverending Project:
In your picture, notice that pin 3 is labeled as N.C. As stated above this is opposite of what you want. If you are comfortable around a soldering iron, you could make a simple inverter with a little piece of perf board and a 7404 inverter chip (should be a couple of bucks, total). Notice also that pin 9 is 12V. Most likely the comparator (and light) will start working if you connect 12V to this line. |
| grantspain:
the N.C means Not Connected on the c220 mechs(wierd british thing),basically its a keyway the fact that you have no coin light could be that the +12 volts is missing-looks like they spliced that into the main loom rather than use the credit board connection the credit board should give no signal to the game board until a coin is inserted,if you disconnected the coin mech and still get the problem it is likely credit board at fault the jumpers on the credit board are coin inhibits there are 2 dil switch banks,one is under the eprom which has the country settings and 2 channel/direct option(as used on twin games) the other switch is the coin for credit strange how it is wired though,the yellow/grey is connected to output 2-i have only ever seen this connected on twin machines not single cabs |
| Ninja-chicken:
Just to add more info to this little quest: When I unplug the mech from the board the problem still persists, so I think the credit board is either wired wrong or is broken. Also, buying a new coin mech is a last resort, obviously I'd like to restore the original one if possible. |
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