WG Screen wobble

[Sluggy]

WG K7000

When power up you get about 4 mins of screen wobble, Not bloom, not sync, not roll

the screen wobbles, any thoughts?

Powered by Iso trans but running at 136volt.... bit high but would that cause it??

If it remained throughout play I would say power wobble but it goes after about 4 so sort of ruled that out... tried dropping the Iso out of the machine and putting the other side of the room but still happens.

 

[gunblade]

what size tube?

 

[big10p]

Tried disconnecting the degauss coil?

 

[gunblade]

check b+

19" should be 123v

25" should 130v

first things to check are dry solder joints and caps c57 and c56, i don't think regulator ic is problem as fault would be permanent

another thing to check is ptc, you can eliminate that by removing from circuit (r105)

 

[Sluggy]

...... oh yeah forgot that bit..... 19"

What about that input power being 136v looks like max tolerance would be 132v?

 

[Sluggy]

Cheers guys gives me a few things to play with next weekend