Author Topic: System 80 Driver Board / Gottlieb Q's  (Read 1281 times)

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Offline MartyJ

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Re: System 80 Driver Board / Gottlieb Q's
« Reply #30 on: May 04, 2009, 06:44:03 PM »

Marty - Check all the playfield fuses and EVERY coil on the machine.

I have three driver boards in front of me, and all three have still got the original transistors (8026). So if you have the 2n3055 transistors installed, then the ORIGINALS may have been replaced at some stage. Someone may have replaced the transistors due to a fault during its route days.

I'm measuring .674 on all collectors, nothing on the emitter. This is with the board out of circuit. All my boards are out of projects, so they are untested.

You are welcome to borrow my board.

Bit of an update re the strange readings...

Big thanks to Silverball for his help this morning   ^^^

Basically to cut a long story short the readings are due to my multimeter.  Its not a real cheapo but not an expensive one and has been OK up to this point.
I tested the same transistors with Dave's multimeter (a good one) and identifed what the correct readings should be.  Hooked my multimeter up, completely different readings (inc null on the emitters).

So - instead I will get myself a Fluke (or one like Daves)....
I would gladly lend you mine but as you saw yesterday, my meter gets a regular workout. Fell free to pop in anytime and do some testing and the offer still stands on you swapping out any pcb that you may not be happy with. You may want to update the toasty pic of your driver board with the nice fresh one we gave you yesterday. ^^^(joking)
I would change settings to 240v, although as we discussed 220v wouldnt hurt.

I would love to buy one like yours Dave, but cannot find them anywhere....Always the way with good stuff like that.
I will update a photo of the amost NOS board of yours.  You're a lucky man with such a treasure trove of so many spare parts!
I've got to replace a couple of transistors on this one too, but everything else is 100%.  I reckon it the transistors probably shorted in the first few months of its life and has been shelved ever since.!