Heck it s not easy to work on either.
Gottlieb system 1 power supply repair.
Remove the original power supply board from the heatsink plate and install this board using the same mounting holes and screws.
The gottlieb system 1 power supply is a fairly robust device.
Power supply board overview.
You can click on the image to see the full size view of the schematic which can be saved or printed.
New design uses new components and runs much cooler.
Untested gottlieb pinball system 1 power supply 12 21 2188 00 parts repair 1978.
I also include a pdf of the schematic.
A simple cure for the system 1 and 80 x regulator supply ground problems is to connect the ground plane of the regulator circuit board to one or two of the studs that the securing screws use to hold the circuit board to the regulator s heat sink and then making sure that the heat sink frame is connected to the cabinet ground plane.
A gottlieb system 1 power supply can be repaired refurbished for a only a few dollars in parts.
Gottlieb system 1 sound board original.
Gottlieb system 1 power supply schematic with voltages.
But it certainly is not perfect.
The first picture below is the system 1 power supply with voltage notations plus other info.
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New redesigned power supply for gottlieb system 1 plug and play.