What you have is Black is on pin 1, 2 and 3.
White is on pin 7 and black is on pin 8 and 9.
This is wired for 115 volt.

If you want to high tap it for 103.5 volts you move one black jumper from 8 and 9 to 6 and 5.
Then move white from pin 7 to pin 4.

pasted_image (resized).png

This is used for input voltage of 103.5. A lot of arcades ran too many games on each breaker causing a low voltage to all the games. They would used this setting to boost the out voltage of the transformer 11%. But it you have good input voltage (115) and use this setting you will still boost the output voltage 11%. So now a input of 115 would be output of 127.65 volts. But this raises everything in the game so unreg. 12 which is usually 14 would be 15.54 volts.

Normally 25 volt coils will read @ 36-39 volts DC. 50 volt coils will read @ 65-69 volts DC. There are much better ways to fix a low voltage issues then high tapping the transformer. For EMs this is a quick fix to make it snappier, but they didn't have electronics to mess up.

I was just answering his questions about the high tapping. He seemed to think if he selected the 103.5 settings that he would lower the voltage to 103.5 instead of 115. I just pointed out that he would just raise it even higher then it was by selecting the 103.5 setting. I also gave him normal average voltages for a system 11 game to compare as some people think 39 volts on a 25 volt line is way out of specs. Sorry if I didn't explain myself correctly, my bad.

What does you wall outlet read? Most likely a tad bit higher than it should be. I'm guessing @ 122-125 volts AC.

Someone has been busy on the power supply but not in a good way. The IC voltage regulator has been abused by a soldering iron.

pasted_image (resized).png

No!

This is your issue, it's a bit high.

Yea it's @ 10 volts higher than normal. Going to have to increase the EOS gap for sure.

Yep.

Take a voltage reading from the Earthshaker or the Black knight 2000, I would bet you get very similar readings.

A power conditioner can correct this but are very costly. You can put all your pins on one breaker and turn all on together to try and drop the voltage.

This is a cheaper solution.

https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwi-oteSj7DfAhULPGkKHY9SDPAYABAYGgJpcQ&ohost=www.google.com&cid=CAESEeD2ugIozqghqC-My8mzJuNu&sig=AOD64_0TipCdeFrMX9RgNbZ2ZVGuZfnn4w&ctype=5&q=&ved=0ahUKEwj9s9KSj7DfAhUo2IMKHeFrBuMQ9aACCEM&adurl=

Ohm's law works for both AC and DC circuits. If the load your pinball machine stays the same and the voltage goes up, then the current will decrease.

It would seem this way. But they are more thing involved here. If you use a 120 watt bulb at 120 volts it uses 1 amp of current (VxI=P) So now lets double the voltage to 240 volts and the current will drop by 1/2. 240 volts x .5 amps = 120 watts

pasted_image (resized).png

On the other hand if you take a 120 watt bulb meant to operate on a 120 volts and raise the volts to 240 it will double the current for a split second until the filament burns out. This is because the bulb is now using 480 watts and designed for 120 watts.

He has higher than normal voltage on all his games that have a aux power supply.

He has 3 system 11B machines. All 3 machines have 75 volts on the 50 volt coils. All 3 machines have 124 volts going into them. Is this AC power within power company specs, yes but at it very highest limits. I would assume if he just rebuilt the flippers on Earthshaker they would seem overly strong too. When bridge rectifiers start going bad there efficiency will not go up it will go down. The same goes for the electrolytic cap in the circuit. There is nothing else involved in making the 50 volt signal.

I haven't suggested throwing any parts at this machine. I have only answered questions and asked for voltage tests.

If you believe this, then I challenge you to test your mousin around pin and post the results. Check wall outlet and coil voltage.

The 26 and 48 volt lines don't have any load on them. If you retest the 48 volt while holding both flippers buttons you will find it closer to the 7%.

Can you also check the flipper coils ohms on the power winding. Just curious to know if you have gotten mislabeled coils. Anything is possible.

What coils do you have in there?