Leaderboard

It’s always VR3 that fails!! And that’s the one no one knows how to set it up!

I have a mps power supply the original Rifa caps had gone on, I can’t see why people go for the filters when they are a lot more expensive than getting the correct capacitors, you have to take the psu apart to take the old Rifa ones out so it’s no sweat to replace them as you go!! This little lot turned up today, enough to do 10 power supplies and all for under £10 inc vat! to me much cheaper at £1 per power supply to replace! AND they are X1 and Y1 which is rated at higher voltage than X2 and Y2 bargains can be had!!!

ok sorry VR3 is a variable resistor which sets the point at which the 5v is shut down when the power is turned of, this is done to prevent the 5v from dropping below 5v and causing corruption to the program on the main MPU and subsequent RAM corruption. when VR3 fails there is no 5v output, but there is also 2 x 3Amp fuses from the transformer winding which can fail because of 'heavy handling' of the psu and something gets shorted out! Indeed the very first one I did had been looked at by someone else and the 12v regulator had its output at around 20v because it had gone short! not something you want up the 12v line! the 12v regulator transistor was dead short not regulating at all. because these are of metal construction power supplies it is dead easy to short something or do more damage, they are not that forgiving if your not sure what your doing.

Here you go fella. queen vic.zip

Made a new fuse cover too as it was missing, it will do!!!!!

If she does. Let me know if she's A natural blonde🤗

brilliant cheers

Here is a little video of the classic i made of this a few years ago.

Found this interesting article on Project Coin. First it celebrates 10000th Seven Heaven off the production line but not for sale as they were to put it into an already established machine museum in their London factory. This does not say the end of production of this machine so can only guess what the final total was. How many left of those 10000+ machines, Does that museum still exist ?