Think on this for a while.....it's no different from kids and modified cars and fakebook and forums.
We "dabble" with arcade machines at work (speed up, Tokyo wars, indy 500, terminator 2......), by "dabble" , the boss likes playing with them and I've always seen them as nothing more than a waste of time, space and money, never had any interest.
We've picked up quite a lot of old ones which have been sitting around broken for a number of years...........not unlike failed car projects.
So take them one at a time, they've been patched up by inexperienced, unqualified people, you can tell just by looking.
They don't go, they don't have just one fault but many. Some caused by previous repairs, some by old age and some by possums, rats and mice while in storage.
Boss man doesn't like me calling them all lemons or turds or whatever else.
Arcade games.......there's really not a lot to them, not when you break it down.
They come from Japan or Murica, designed for 110v AC, The NZ ones run off 230V AC, have a 230 to 110 stepdown transformer, have a 110V PSU to give +12, +5 and maybe -12 or -5 to the game board, the video board is 110v AC input, RGB video input CGA, essentially an american TV (NTSC) minus the tuner.
The power supplies all die due to the electrolytic capacitors as do the video boards. The game boards are pretty much not fixable due to lack of circuit diagrams and parts but are otherwise very reliable. CRTs lose their brightness over time, lose focus etc, specially when they never get turned off.
The quick fix is usually a conversion to flat screen LCD with a china com converter but the converters seem to all crap out, also use a second hand PC power supply for the +12 and +5, so long as you can find a good one which means knowing how to test them under load.
That just leaves the game board........It's quicker but not better than fixing the real problems.
So I get the message passed on to me from boss man.........if they don't work, check the 5 v supply with a meter and turn it up to 5.2v, it often fixes them....
BUTThe original PSUs have adjustable 5v outputs......it's only for the original setup , NOT for fixing faults at a later date.
Me......no ......it doesn't work like that.........who TF told you that?....oh this bloke here, he's been fixing them for years.....me.......no he's just making it all up, he's just a salesman like you and he's got no effing idea and he just read that on an arcade forum just like you did yourself...........AND if I do what you say it'll crap out next week and you won't be happy, even less happy now that I've told you.
me.......The 5v supply is supposed to be exactly 5v.
If you use a meter and it's less than 5 volt .......you're using the wrong instrument because they get ripple on them from failed capacitors, it reads the average voltage and you should be using an oscilloscope to see the ripple.
IF you turn it up to 5.2 you stand a good chance of blowing everything up.
AND if it does actually work then there's a fault somewhere else (maybe a loss of 0.2v between the PSU and game board?) that needs fixing properly before it blows up which means you've got to turn the 5V back down to where it was .........SO..........you're using guesswork AND you're having to do the job 3 times now because you did it wrong the first time.....by using the wrong tools and the wrong method.........and BTW ............why don't you just go get HIM to fix it for you instead on ME.......like WTF would I know.........I'm only government trained , did board repairs for NZPO / Telecom for 15 years and done the same for myself for more than another 15 years.....AND you should know that because you've been told before and that's why I'm here ......and ........why don't you just go back to the office and leave me alone, go do some more deals on the phone....and keep off the arcade forums........
Just turn up the 5v to 5.2?
Try it on your car ECU?
Well no you can't, there's no adjustment.
Kids like to fiddle, if you can.......but if you can't?
That's what makes programmable aftermarket ECUs so good for your car.....more ways to get it completely wrong when you don't know WTF you're doing and blow it all up.
Why put a knob on a power supply anyway?So that the person with zero knowledge, zero tools and zero skills can fiddle with it?When there's nothing else they can fiddle with.
See....everything is on ewetoob.......https://www.youtube.com/watch?v=M9JNeP3tiaY
quote from barryboys.
Yes, yes, yes, that might be so, but you're clearly missing the bigger picture.....