Missile command power

[bonehead]

Just switched on my missile command and have no power to the monitor.!!!
Game plays blind. Neck on tube had no glow. Tested with meter and no voltage. Checked fuses in power brick and all are fine. There seems to be a small step down transformer in the base next to the if power brick. Would the 120v be comming from this? If so could this be replaced with a stepson from another cab to test the monitor is ok?

Sorry for all the dumb questions I am new to fixing cabs and want to learn to try and keep my collection going.

Cheers,
Steve

 

[tb lilley]

Is the marquee light on?

Marquee light and monitor power both come off same tap on the power brick - so if the marquee is lit you'll have 120VAC in there somewhere.

 

[bonehead]

Hi, marque light is wired direct to 240v as it is tapped onto wires that come into the cab. Where do I look from here please?
Thanks,
Steve

 

[tb lilley]

Sounds like a bodge then ..... the 120V for the monitor should still come off the power brick - but maybe thats been bodged too, so who knows.

What monitor is in the cab?

Trace the monitor power wiring back to its origin, is it wired to the power brick?

 

[bonehead]

It is a electro home 507 I think. It is wired to the small dropper transformer in the base.
Does that sound right?
I can get a pic tomorrow if that helps.
Cheers,
Steve.

 

[tb lilley]

GO7 - but yeah, sounds right.

The small ISO transformer takes 115VAC from the power brick - isolates it - then chucks 115VAC back out. I'd start with the power brick - check it's giving out the 115VAC - then check that the 115VAC is finding its way into and out of the ISO.