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