how to install a switching power supply on a Ms. Pacman?

br549autosales

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how to install a switching power supply on a Ms. Pacman?

I have a Ms Pacman that I believe needs a power supply, can someone give me instructions as to which wires to cut from the original cabinet and how they need to be installed on ta switching power supply?

Thanks
 
Personally I wouldn't replace it, I've rarely seen a pacman that actually needed a new power supply. The voltages are supplied by a transformer that hardly ever goes bad. You may have fuse or fuse holder issues going on, or edge connector issues but your actual power supply likely isn't the problem.
 
I will check the fuse holders then. When you say edge connector issues, do you mean the one on the pcb board or the edge connector on the harness that pushes onto the pcb board?
 
Basically, Pac Man (or Ms. Pac-Man) runs on AC voltage. It's turned into DC on the gameboard... you can run it with a switching power supply (dc) but you don't need to since the power supply in the upper left corner of the pac board works really well usually.

So the power comes off of the transformer, and runs to 4 fuses. If those fuses are dirty, or aren't being held tightly by the fuse holders, or are blown, the voltage won't get through.

From there, the ac voltage goes over to 4 wires on the connector of the gameboard. Over time, the connectors get burnt. BOTH the edge connector, and the pcb's edge connectors get burnt. You need to clean both with a file, or something to get them where they're making good contact. If they're burnt badly you may have to repair them by putting copper on the edge connector or replacing the pins in the housing.

If you hook up a switcher, you'll still have the same problem with the edge connector... so it doesn't really help and costs more.

So here's how you check it. Turn the game on. Using your multimeter set on a/c, check the voltages on the top two fuses... left of the fuses. It'll be 14 volts, or 7 volts (can't remember which is the top two). Or somewhere near there. Now, check the same two on the right side of the fuses. Don't touch the fuses, check down where the wire is soldered. You should have nearly the same amount... if you do, then the power is working through the fuses no problem. If you don't get very much voltage, then you have problems with the fuses or the holders. Do the same with the bottom two fuses.

Once you've getting good power on the right side of the fuses, you can check the same exact way on the diodes on the pcb. If you look close, where the power runs in it runs down the board and touches some diodes. The diodes rectify the power and turn it from ac to dc... see if you're still getting that power at those diodes that you had over on the fuses. If you are, then your edge connector is good.

You'll be losing your power somewhere, either at the fuses or at the edge connector.
 
Basically, Pac Man (or Ms. Pac-Man) runs on AC voltage. It's turned into DC on the gameboard... you can run it with a switching power supply (dc) but you don't need to since the power supply in the upper left corner of the pac board works really well usually.

So the power comes off of the transformer, and runs to 4 fuses. If those fuses are dirty, or aren't being held tightly by the fuse holders, or are blown, the voltage won't get through.

From there, the ac voltage goes over to 4 wires on the connector of the gameboard. Over time, the connectors get burnt. BOTH the edge connector, and the pcb's edge connectors get burnt. You need to clean both with a file, or something to get them where they're making good contact. If they're burnt badly you may have to repair them by putting copper on the edge connector or replacing the pins in the housing.

If you hook up a switcher, you'll still have the same problem with the edge connector... so it doesn't really help and costs more.

So here's how you check it. Turn the game on. Using your multimeter set on a/c, check the voltages on the top two fuses... left of the fuses. It'll be 14 volts, or 7 volts (can't remember which is the top two). Or somewhere near there. Now, check the same two on the right side of the fuses. Don't touch the fuses, check down where the wire is soldered. You should have nearly the same amount... if you do, then the power is working through the fuses no problem. If you don't get very much voltage, then you have problems with the fuses or the holders. Do the same with the bottom two fuses.

Once you've getting good power on the right side of the fuses, you can check the same exact way on the diodes on the pcb. If you look close, where the power runs in it runs down the board and touches some diodes. The diodes rectify the power and turn it from ac to dc... see if you're still getting that power at those diodes that you had over on the fuses. If you are, then your edge connector is good.

You'll be losing your power somewhere, either at the fuses or at the edge connector.

This is older but explained well "Helps me at the moment"

So bring it to the top.:)
 
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