No 12V, Midway linear power supply board in Omega Race (1981)

[ELutz]

If I'm seeing the schematics correctly.....you have a 3-pin connector with two wires in it, that plugs into the power supply board. This is the AC input for the dead rail you've got. Unplug this connector and put you meter on the two wires and check AC volts across the two wires. If you've got nothing here....you have a blown fuse (manual calls 2 amp slo-blo). If you've got juice here....something's up with this connector....or one (or more) of the four diodes by the previously mentioned resistor.

I'm going with a blown fuse

Edward

 

[vintagegamer]

If I'm seeing the schematics correctly.....you have a 3-pin connector with two wires in it, that plugs into the power supply board. This is the AC input for the dead rail you've got. Unplug this connector and put you meter on the two wires and check AC volts across the two wires. If you've got nothing here....you have a blown fuse (manual calls 2 amp slo-blo). If you've got juice here....something's up with this connector....or one (or more) of the four diodes by the previously mentioned resistor.

I'm going with a blown fuse

Edward

i checked all the fuses on the power brick last nt with a meter and they all tested good but did not check the connector to the ps board. Will check today-

 

[ELutz]

i checked all the fuses on the power brick last nt with a meter and they all tested good but did not check the connector to the ps board. Will check today-

Did you pull the fuses to check them? If not, you could be reading the winding of the transformer, which is probably very low ohms.

Edward

 

[vintagegamer]

Did you pull the fuses to check them? If not, you could be reading the winding of the transformer, which is probably very low ohms.

Edward

yep i pulled each one- just ran out to check the 3 pin connector and it's reading 0. New fuse time I guess!