I purchased a 110v to 24v transformer to run through a bridge rectifier for Bally -17/-35 MPU board bench testing. The transformer actually puts out 28v. Wondering if it's still ok to attach this 28v to TP3. Is it within tolerance or is it too high for this purpose. Thanks.

Just thought of this. I guess I could add a resister to lower it.

Thanks for the reply. I already planned on replacing R113 and R16 with 1/2 watt for any board I tinker with. I think using a connector is better. I'm trying to mimic the real thing as close as possible. Maybe I can find something that outputs 43v.

Found a decent variable output transformer with a digital meter for $60. It's a maybe.

Thanks. Good info. I did know that a couple games have a diode instead of a resistor. So if U14 works with a 28v input then it will work fine with a 43v input. My main goal is verifying that U14 is functioning. So it's logical to say that with voltage at pin 15 and all of the support components are good, (and U10 is new) if there is no 7th flash then U14 needs to be replaced.