Just found this AC studio flash head at a thrift store today for $2.99. Don't know anything about these so I'm not sure if it even works. It appears to power up fine...'ready' and 'power' lights are on and the modeling light works. I can't get the flash to fire though. Pressing the Test button does nothing and trying to fire it via sync cord does nothing either.
Box says 'to use with standard PC cord furnished, an optional 6 volt battery is required'. Does this mean PC sync will only work if the battery is good? If so, why does it need a battery since the power is coming from a wall outlet? It should still fire via the Test button regardless if the battery is good or not, yes?