[lugan]

Hi,

Well, I did my convergence on 6PG "by the book", all warmup and other stuff was done before I started working on it. Everything worked perfect.

Now I started noticing that if projector is fresh that day (turned on for the first time that day) the amplitude (horizontal and vertical) is wider by at least 5 inches on each side than when projector has completely warmed up! Why the heck this is happening. Is there a way to avoid this daily amplitude adjustment? Convergence drifts a tiny bit too.

 

[lugan]

Forgot to mention, projector is in a custom cabinet which does have a decent ventilation.

 

[Curt Palme]

If the height does not drift, I'd suspect a bad cap in the H output stage (deflection board). If the height drifts too, then maybe a drifting power supply. Try monitoring the power supply voltages with a meter as the set is warming up.


Maybe Doug Baisey has other ideas...


Curt

 

[lugan]

Height and width changes. Both about the same amount.

This PJ has like 300 hours, no more than that.

 

[Teran]

Does it drift slowly or does it "snap to"?


I don't have an answer, but am experiencing a snap to after about an hour on my horizontal amplitude.