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That is why I don't operate machines ,I worked for a few operators here and there through the 80's,90's that kind of thing was not unheard of.

Those press in plugs are great for production but break down over time

Not a fun board to work on RIOT chips allways seemed to run hot hopefuully its a 7404 or 7400 first inline and easier to change.

Look for a 210 to 270K resistor that is open it feeds B+ to the driver IC on startup

IRL is stronger the IRF has failed on me but is very common that is why I mentioned doubling them up ,IRFP250 is a monster but it will fit used once on a stubborn problem and still going a year later. Starburst sells P20N10 have had good results with it.

The cabinet buttons need to be taken out and cleaned once in a while

Mad scientist re-wire? sometimes in that situation you need to study an identical game.

I had one a little finiky ;fun to play

O well if it was easy everybody would do it. You have to enjoy a good puzzle to work on this stuff,as for it's value its all what it is worth to someone

You checked all the basics good thing I've seen too many replace a blown up board but they did not find out what blew up the first board

Thing with Germanium diodes when they fail they tend to open rather than short so if you get some nasty coil voltage heading to the mpu they tend to open before they burn the board up. Pretty much any diode will work in its place the strobe rate is only 400 cycles per second but a rectifier will...

That is what I like a resolution; so many times I give advice and get no feedback,when all I want to hear is"did that fix it?"

IRF540 is pretty common you can double them up for more current it gets a little crowded but it works. IRFP 250 works fit the centre lead thru the board the 2 outside solder on the top. Thing with mosfets is the gate current is barely a microamp the device turns on with a voltage so its very...

AX ,R and U relays are trouble get a schematic from Steve Young pinball resource instruction manual has Operating instructions[startup] before you hack up the harness .Found 2 many torn up harnesses

Parallel to usb then usb to parallel? just buy a jamma harness and rewire it

Complete,paint on backglass and playfield is good ask $500 as is does have all the bumper caps

They have their uses if you need something fast I once worked in the Hamilton branch of Starburst formerly Gametime,if they have it in stock they can courier to you right quick. I like John's Jukes no border there either.

The circuit board schematics are missing "Back to the Future" has the missing pages

J4 on the SDU gets bad pins that generation had troubles with the little .092 pin connectors, a lot of problems start there.

Then unless those IC's are in sockets don't replace them you can create more problems than what you started with