Asteroids Deluxe Wavy test lines...Yoke?

GameyMcGame

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Should have put this in this section to begin with...

I've been digging into some old posts about this...My AD has wavy line in test mode. It plays fine but its noticable since ships moving straight across the monitor start small, get big, then small etc. Just annoying....

I've messed with the adjustment puts but it seems to be more than that. A couple prior posts seem to point to bad yokes.

Anyway to know fo sho? if so, where can I find a replacement yoke? Thanks
 
I'd go with caps before a bad yoke. Caps on the monitor and the filter cap in the bottom of the game.
 
well, what makes you think that? Would wavy lines indicate bad caps? From everything I've read, this sounds exactly like a yoke issue...No blooming etc to indicate caps are bad...
 
All of the Asteroids and Asteroids DLX monitors I've repaired that had wavy lines had bad caps. In the 20+ years I've been in this business I've never had a bad yoke on one of those monitors. Blooming would be the high voltage diode.

Besides, its a lot easier to change caps then it is to find some one thats willing to give up a yoke. If the caps look like they have been repalced within the last few years then it may not be them afterall. Or it could be them because caps of late seem to be really crappy.

Matt
 
As someone said in the other post, it sounds like linearity. What kind of monitor is it? It should have some linearity adjustment pots.

A photo of the crosshatch test pattern will make linearity problems obvious.
 
All of the Asteroids and Asteroids DLX monitors I've repaired that had wavy lines had bad caps. In the 20+ years I've been in this business I've never had a bad yoke on one of those monitors. Blooming would be the high voltage diode.

Besides, its a lot easier to change caps then it is to find some one thats willing to give up a yoke. If the caps look like they have been repalced within the last few years then it may not be them afterall. Or it could be them because caps of late seem to be really crappy.

Matt

I had a 'bad' yoke.. still worked fine but there was a single vertical band about 1/16" wide where any vector in that area had a little bump up on it. It drove me nuts until someone else posted something similar.. so I changed the yoke and it was gone. But this sounds like something else.
 
If you are considering replacing a yoke on a monitor that has never even been capped, you are crazy. Order the cap kit, the pots, and the filter caps and then see where you are at. The monitor needs it anyway. Flow new solder on the connector pins too.
 
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