Sanyo 20EZ Convergence Tilt issue

Straymute

Member
Joined
Aug 17, 2010
Messages
49
Reaction score
0
Location
Gilbert, Arizona
Hey folks, I'm having a bit of a convergence issue on a Sanyo 20EZ from a Nintendo Popeye. Basically everything looks GREAT except the bottom right side gets thrown out of convergence pretty bad, with the color beams spreading out like a fan. The upper right side gets thrown out a little, but not as bad. I've heard suggestions that it could be everything from a shadow mask to a yoke adjustment to a bad cap. Big question is, where to start?

I've searched the forums and I haven't found anything specifically related to single corner convergence issues.

What do you think?

-Wes
 

Attachments

  • popeye_converge.jpg
    popeye_converge.jpg
    26.4 KB · Views: 106
Dokert, thanks for the reply! Before I go and start mucking around with those rings I wanted to get a closer look at what was going on. I don't have a good test screen but with 2 player score up I can tell some additional things (2p score not pictured, unfortunately). It appears that I have some geometry issues AND some convergence issues, have a look at the pic and I'll explain

The lines at the top and bottom show how the convergence is, well, diverging as you move to the right. That's problem 1.

The box in the middle shows how the screen geometry also somewhat goofy. It looks clean on the left side, but is about a 1/2 inch in from the top and bottom of the tube, and on the right side you can tell from the FIRST picture the image is tall enough to be cutoff by the tube. So that's problem 2.

Will mucking with the rings give me a chance to fix both of these problems, or just create problem 3?

So far, I'm kind of leaning towards capkitting it first to fix the geometry, and if I still have issues then, I could muck with the rings or do some convergence strips or something. What do you think?

Also, fyi, total noob here..

Thanks
-Wes
 

Attachments

  • popeye_converge2.jpg
    popeye_converge2.jpg
    94.2 KB · Views: 105
Much better picture.

A cap kit will NOT fix that problem.

Your yoke has been bumped or moved. Loosen the yoke screw and shift the yoke back to where it belongs. You can do it with power on or off. The easiest way is with power on, so you can see the pic as it changes.
 
Still Alive!

OK, so, I fixed it as well as its going to be fixed for now. Bottom line is, it *was* a shifted deflection yoke! For those dealing with this same issue, here's how it all went down:

So I turned off the machine, loosened the flyback screw 3 rotations, and grabbed the large white plastic part of the yoke and "unseated" it from the glue/gunk holding it in place. Then I proceeded to power the thing back on and do this thing "hot".

On the Popeye, the flyback is sitting high and right in your face, so adjusting this thing "on the fly" is exactly that. I dunno how many of you have tried adjusting an EZ20 yoke WHILE the thing is on, but let me tell you this, you can *feel* the energy coming through the flyback (all the hair on my arm went straight up). So I did that with my wife "helping" me with the adjustment and she was basically no help, I torqued that friggin yoke all around the place and finally everything looked great convergence wise, but the colors on the left and right were off. At this point I'm thinking "DONE except for degauss, woo!", so I cleaned up and busted out my brand new super awesome 50 dollar degaussing coil to degauss it. Did it work?

NO. Do you know why? (If you do just hold on, I'm getting there).

Popeye doesn't have a test pattern generator or anything like this, so I'm basing my adjustments on a few 000s in the player scores and the bottom water line, so overall when I say things matched up, that's what I'm talking about.

But now my left side is all showing YELLOW instead of RED and my right side is all showing GREEN instead of BLUE. Ok, so at this point I'm thinking "Purity RING ADJUSTMENT TIME!"

Yeah, No. Thank god I didn't start adjusting those.

So here's the status at *this* point in time.
1) the yoke was SOOO far out of position (specifically, away from the tube) thanks to my amateur CRT repair skills that purity was WAAAAY off, even though it *seemed* to be converging correctly.
2) the little rubber wedges had to be shoved all the way down to even contact the yoke (VERY BAD)
3) I was seriously afraid of electrocuting myself
4) Degaussing WOULD NEVER work in this situation and Purity RING adjustment would have F***ED me even more than I was.

Ok
So finally I got up enough guts to go back in there and fiddle with it some more, this time without the threat of impending death from flyback, as I powered it down everytime I adjusted it. My plan was simple. Loosen the yoke again, Remove all the wedges, and fix my purity FIRST. Then start minor adjustments to understand everything else.

Skipping to the end, here's what worked:
1) Loosen the yoke clamp very modestly, it doesnt take much and you want some friction to keep it in place
2) Only move the thing in one direction at a time. Here's the directions and what they did:
Forward, backward on the tube neck - Helps/hurts purity and that's about it from what I can tell
Pitch Up, Pitch Down - Jacks with the linear width convergence, in my case, I did not have to adjust this.
Yaw Left, Yaw Right - If your Red is above the blue on the left side, and is below blue on right side, this is what you should adjust.
Rotate Left, Rotate Right.- Levels the playing field, I needed to do this one a little too.

So, in the end I fixed the convergence as much as I could (without a test pattern generator), learned how NOT to adjust a yoke, how TO adjust a yoke, and how to sack up and rub your arm up against a live flyback. After doing that monitors aren't so scary anymore...

Anyway, Dokert, thanks for the help!
 
I have been shocked enough by EZs that I will never mess with a yoke on them, live or off. took me long enough to get used to disconnecting the anode lol

bravo to you sir. even more-so if you did all this with the monitor mounted inside the cab. (biggest pain in the ass ever)
 
Back
Top Bottom