The 12V rectifier has correct 14VAC in, but has 25VDC out!
This suggests to me that the problem is not with the transformers. Sounds to me like a voltage is be introduced from a short, crossed wire or faulty component after the rectifier?
You were right
Always had a short in my mind, but I was going around in circles lifting the Playfield up and down doing constant measurements. Sometimes this 12V/38V was fine, sometimes jumping to 20+V/60V.
So today I started from scratch again. Unplugged everything, de-soldered all the rectifiers and had two multimeters measuring AC & DC at the same time whilst reconnecting. (Unplugging mains each time)
Everything was perfect 14VDC & 40VDC, until getting to the GI. I still have the fuses F1/F2 removed, but when I de-soldered all the GI playfield/Light box main feeds I’m at a point where it is definitely within the GI section somewhere. Keep in mind to GI works perfectly (with fuses in) even with these high readings.
Maybe the 14V + a 6+V GI are giving me the 20+V reading and the excessive 20V + 38V is giving me 60V somehow?
Ran out of time today, so will hopefully find my ‘stupid’ mistake tomorrow.
Thanks for all the pointers, guys.
Cheers, Paul.
