Star Wars Amplifone issue

SuperBee4406

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I just installed a repaired HV PCB and Deflection PCB in my Star Wars and the game seems to run fine until you get to scenes with alot of vector drawing, like the Death Star Blowing up, or getting hit by alot of shots. The screen will get blurry and greyish and twitch with the action. I made two short videos trying to show the problem. If you watch the screen especially by the shields and score area you'll see the twitching and blurring effect. When the vector drawing is low or low action on the screen, everything goes back to normal. The flyback is new. Any suggestions on adjustments I need to make?

Watch up by the shields, and scoring area:

http://www.youtube.com/watch?v=U7mpWm3DoXo

http://www.youtube.com/watch?v=zkcXjFBwaZ0
 
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It's kinda hard to tell from the video, but it looks to have a blooming problem... did you adjust the HV when you installed the new flyback?

DogP
 
Nothing been adjusted yet. I am looking for suggestions and what to mess with first before I do something wrong, and my hard to come by HV PCB burns up.

I'll need a HV probe to check the high voltage, correct?
 
Nothing been adjusted yet. I am looking for suggestions and what to mess with first before I do something wrong, and my hard to come by HV PCB burns up.

I'll need a HV probe to check the high voltage, correct?

Yes. And i'm curious what repairs were done to your HV pcb. Did you do any of the upgrades ?
 
Adjusting w/ an HV probe is definitely the preferred method... but I've read several places (like: http://www.repairfaq.org/REPAIR/F_VAtari2.html#VATARI_005 ) that you can adjust the B+ to 180V, though www.cinelabs.com/amp/Amplifone_Install.pdf says you shouldn't do that, and instead use an HV probe.

IMO, if you don't have an HV probe, I'd follow the instructions from the cinelabs document, but adjust the B+ to 180V to get it in the ballpark, though definitely take the warning about adjusting the frequency to either extreme, because it will blow the output transistor. And note that you should be adjusting the voltage with no signal applied.

Of course if you get access to an HV probe, you should verify it, but it's pretty safe to say that it's incorrectly adjusted now, so 180V should at least get you closer.

DogP
 
Yes. And i'm curious what repairs were done to your HV pcb. Did you do any of the upgrades ?

Repairs that were made, were just to get it working. No mods performed yet, but now that it works(with some adjustments still needed), I am working with fellow KLOVer retroActive to upgrade both boards, and get them bulletproofed. I am keeping the back off the cab until the mods are performed.
 
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