So I've finally found some time to get a chance to work on a vintage pinball machine I've had in collection for awhile since the driver board has reached my front door. Whenever the switch is flipped the main fuse is blown (the first fuse from the wall). Nothing is really connected except for the power supply board so I figure it must be a hard short somewhere.
The main transformer in the head is labelled 1-8 on the input side. The schematic shows coils between 1-2, 3-4, 5-6, 7-8. Measuring the resistance across all of these gives me an 'open circuit' reading for 1-2, 5-6, 7-8, and only ~1ohm across 3-4. Do I have a short in my transformer causing this, or is this normal in some cases? Could be a nasty fix. Thanks.
The main transformer in the head is labelled 1-8 on the input side. The schematic shows coils between 1-2, 3-4, 5-6, 7-8. Measuring the resistance across all of these gives me an 'open circuit' reading for 1-2, 5-6, 7-8, and only ~1ohm across 3-4. Do I have a short in my transformer causing this, or is this normal in some cases? Could be a nasty fix. Thanks.