Atari Asteroids Power Brick problems

[Purity]

Finally I've fired up my Atari power brick with no load and I had a good start

Pins 1 and 4 - 13.62DC
Pins 2 and 4- 13.62DC
Pins 3 and 5 - 13.53DC

Tested Pins 6 and 7 expecting to get around 36 AC.......nothing
Tested Pins 8 and 9 expecting to get around 6.3 AC.....nothing

Also the power brick started to buzz quite a lot

I'm not sure what might be wrong here? AC Line filter dead?

What would explain the buzzing? No load?

It hasn't blown any fuses

edit: posts merged
AnDyC2010-09-17 20:35:16

 

[andyman]

Buzzing could be the plates that make up the core of the transformer de laminating, if its a corner bolted tranny, tighten them up.

Andy.

 

[guddler]

Ok, not in a position to look at schems right now but a couple of immediate thoughts:

[list type=decimal][*]A dead or faulty line filter would either = no volts or a blown fuse so that's probably fine.[*]Are you 100% sure this is an asteroids brick?[/list type=decimal]

If the answer to 2 is yes then I'll dog out the schems later and investigate. This didn't ought to be difficult

 

[Purity]

I worked out that I had the molex pin order in the wrong sequence, hence I was testing the wrong pins.

All is ok, getting AC and DC now

Schoolboy error