KISS
Bally, 1979You're currently viewing posts by Pinsider barakandl.
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It is worth checking that the transformer tap is set for 110/120v.
That is a fairly normal reading when unloaded. I would expect a couple of them to be higher with the resistors built onto the rectifier board. As long as you get in the ballpark voltage reading and the fuses don't blow, you are safe to test under load.
Quoted from Lindsey:That is the first thing I would look at. Assuming those are true voltage readings, they`re not even close to where they should be. Even unloaded. Usually the reading will be higher without load. Those readings are way low.
TP3 is the only one which is correct, which is weird. If the mains are connected to the wrong winding on the transformer, all of the readings should be out by the same ratio.
Also ensure that your voltmeter batteries are good and you`re getting good measurements
Lower end DMMs have trouble reading a circuit with no load. Hard to say.... In my experience a bally game everything reads high unloaded except for the 230v for the display reads way low.
Quoted from Lindsey:That`s not really going to be an issue with linear power supplies in a pinball machine. Even the crappiest meter should still get you in the ballpark.
If your meter is giving you those kinds of reading from a known good rectifier board, its time to throw that meter in garbage
There`s an example of checking the rectifier board test points in this video at 4:30.
» YouTube video
What ballgame we playing. Check with a fluke. I can guarantee the high voltage will read like 60v too low. That is 30% off. The only ones you can trust is the dc voltages with the load resistors. Check with a cheap meter, and it gets even further off.
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