In order to get to the solder side of the board to remove any suspect components the power supply must be taken apart.
Gottlieb system 1 power supply repair.
Gottlieb system 1 sound board original.
But it certainly is not perfect.
Power supply board overview.
Remove the original power supply board from the heatsink plate and install this board using the same mounting holes and screws.
However it is one of the trickier boards to work on because of the way the regulator is mounted through the heatsink and onto the pcb.
Heck it s not easy to work on either.
You can click on the image to see the full size view of the schematic which can be saved or printed.
4 3 3 recommended power supply updates repairs.
Untested gottlieb pinball system 1 power supply 12 21 2188 00 parts repair 1978.
New design uses new components and runs much cooler.
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New redesigned power supply for gottlieb system 1 plug and play.
The gottlieb system 1 power supply is a fairly robust device.
The first picture below is the system 1 power supply with voltage notations plus other info.
Gottlieb system 1 power supply schematic with voltages.