WG 19V2000 skewed/wavy lines

parabolic

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Well, I decided to get one out and finally dick with it a bit.
On my asteroids deluxe, the center of the screen is fine, but as the objects would move to the outer edges of the screen, they would sort of "break apart" I put it into test mode and got the pic thats posted below. as you can see the outer box isnt really sqare, and the hash marks are nice in the center, but atart coming apart toward the edges as well.
I have tried another known good working board, and its identical. So im pretty sure its in the monitor.
I had capped this monitor already and replaced all the usual goodies as well (transistors, etc). I would assume its some sort of deflection issue.
Any experts out there care to take a stab?
Thanks!
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I have a similar problem and it turned out to be the yoke.

http://forums.klov.com/showthread.php?t=61125

Before doing anything drastic like replacing the yoke, I would loosen the yoke and adjust it's position. You may also want to adjust the x & y lin pots to see if that helps.

Kent
Kent,
Thanks for the reply. This board doesn't have the lin pots. My battlezone and tempest do though. Ive never really messed with a yoke before. Whats the best and safest way to adjust it - dont want to make it worse.
Is it a rostaional issue (spin the yoke), or more of an in and out issue (closer or farther from the screen)?
Thanks
 
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Ok. I didn't realize the WG didn't have lin pots. The monitor in my AD was a G05.

I would think it's more of an in and out issue. Here's what I did it. I pulled the monitor, set it on the floor, put a mirror in front so I could view the screen as I adjusted the yoke, loosened the yoke clamp, and then began adjusting. You can see the screw that needs to be loosened in the picture below.

http://cid-4127ea3a33b50049.skydriv...de/machines/asteroidsdeluxe/images/g05ad5.jpg

Let me know how this works for you.

Kent
 
I have two Wells Gardner 19v2000 monitors and they both have LIN POTs on the deflection board. They need a special tool to adjust. There is also a brightness POT on the deflection board. X, Y size adjustments are on the main PCB.
 
Sorry about that, I misunderstood.
I thought you meant the bips on the game pcb. I did mess with the lin pots and nothing really changes - it got wavy while turning, but went back to my pic in either direction. It looks like my yoke has hot glue locating it as well as the clamp.
Im a little timid to grab that thing on - safe way of doing it?
Thanks
 
I was nervous at first to, but don't be afraid. Just keep your hands away from the windings and you should be good.

Kent
 
I think I may pull the deflection board out of my Battlezone first and see if it changes anything. I really dont want to mess with the yoke unless I absolutely have too.
Lets just say its the deflection board....what on it would cause this? Just trying to narrow the search a bit. This deflect board needed more work if I remember correctly now. I had to replace a few bad transistors on the board as it had a horizontal line even after the frame trans were replaced. I think it kept blowing 1 of the fuses as well.
I hate getting old these things tend to blend together with the more machines I mess with - lol!
 
I think I may pull the deflection board out of my Battlezone first and see if it changes anything. I really dont want to mess with the yoke unless I absolutely have too.

Good idea, but better yet put your Asteroids and BZ back to back and hook up your Asteroids to the monitor in the BZ. This way you can isolate the problem to the monitor. If that checks out start swapping boards. Are they both 19v2000s? I think the G05 pin out is the same as a 19v2000, but you many want to validate first.

Lets just say its the deflection board....what on it would cause this?

To be honest, I have no idea.

Kent
 
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Yah, im pretty sure its the monitor as I have 2 AD boards and they both look the same on it. I figured if I swap the deflections I would at least eliminate the yoke and the hv section.
Tomorrows another day for that. :)
 
Those old black & white tubes have "metal rings" seated at the base of the yoke...kinda like the convergence rings on a color monitor. There should be two of them. Adjusting them might help.

Edward
 
Yah, im pretty sure its the monitor as I have 2 AD boards and they both look the same on it. I figured if I swap the deflections I would at least eliminate the yoke and the hv section.
Tomorrows another day for that. :)

Ah ok. Yeah, start swapping boards.

Kent
 
So I took the monitor out of the battlezone (it needs a cap kit and the screen grows - i was told a hv diode - anyhow), and plugged it in to the AD - looks great! all the crosshatching lines up, etc. took the deflection board out of it and threw it in the AD - same thing - broken and wavy lines, etc.
So I know its not the game boards, and I know its not the wiring or the deflection board. I had already done a full cap kit with transistors to the AD before, so Im thinking its not that. So were up to a HV cage problem (unlikely, although I have been wrong before), or most likely a Yoke issue.

So I guess next step is to take the monitor out of the AD and start moving the yoke around.
Now do I loosen the clamp and turn it or do I move it in and out? What can I safely touch on it?
Thanks for the help thus far guys.
 
So I guess next step is to take the monitor out of the AD and start moving the yoke around.
Now do I loosen the clamp and turn it or do I move it in and out? What can I safely touch on it?
Thanks for the help thus far guys.

Below is a link to a good thread about how to safely adjust a yoke.

http://forums.klov.com/showthread.php?t=33857

Before adjusting the yoke, I would take Elutz's advice and attempt to adjust the centering rings. While I don't think it will correct your issue, it's worth a try. You may also want to read page 19 of the manual below. It explains how to correct geometry distortion.

http://arcarc.xmission.com/PDF_Moni...Issue 1 Electrohome G05-801 Monochrome XY.pdf

After replacing the yoke on the G05 in my AD, I glued new magnets to the yoke to correct for the distortion. I don't believe this is your problem, but again it's worth a try.

You could also swap yokes between your BZ and AD to isolate the problem to your yoke. I have a strange feeling your yoke is bad. If you read the thread I referenced earlier, you will notice I had a bad yoke.
Kent
 
Kent,
Thanks for the advice. your being most helpful. I did mess with the rigs, and it seemed to move the image around a bit, but it didnt really correct the shape. I REALLY dont want to remove the yoke from the BZ. So the question is how can I test the yoke, and is there a way to fix it if bad? Where to find another yoke for a v2000?
Thanks
 
Kent,
Thanks for the advice. your being most helpful. I did mess with the rigs, and it seemed to move the image around a bit, but it didnt really correct the shape. I REALLY dont want to remove the yoke from the BZ. So the question is how can I test the yoke, and is there a way to fix it if bad? Where to find another yoke for a v2000?
Thanks

I identified my yoke as the problem by swapping. At the time I wasn't sure if the yoke on the G05 I purchased was good, but as luck would have it, it was.

I am aware of two other methods that can be used to test a yoke. One involves measuring the resistance of both windings and comparing the readings to a known good yoke. The other method requires you to swap yoke connections. If the distortion remains, the yoke is most likely your problem. Below is a link which describes each method in more detail.

http://www.repairfaq.org/samnew/tvfaq/tvdeflytst.htm

I have attempted neither so hopefully someone can post the exact procedure for a G05 for both methods.

Kent
 
I wonder if....

1. There's speakers (possibly replacements) in the cab causing the bends
2. If a degausser would help this (doubt it)

If it were me, I'd loosen the yoke and try to move it around to see if it comes together with certain angles. Could just be that over time the heat baked the plastic on the yoke (and rubber wedges) and its sitting at an angle, or perhaps its warped and does need to be replaced. I'm hoping for your sake it can just be corrected.
 
Just wanted to thank everyone for the input and advice. I was able to locate a yoke from member EVB. Nice price and it fixed my problem. I was able to swap out the yokes today. I had to lengthen the wires as they werent quite long enough to make it to the deflection board. Powered it up and it looked like a million bucks right out of the gate! I got it adjusted to square off the pic, and put it back in the machine.
Apparently somone attempted to stick something in behind the windings. Wedge, screwdriver, etc. Anyhow, it looks as if a few of the windings have been bent and broken. Attached is a pic.

attachment.php


So there you have it! I figured Id post an end result for the next guy.
Thanks!
 

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Just wanted to thank everyone for the input and advice. I was able to locate a yoke from member EVB. Nice price and it fixed my problem. I was able to swap out the yokes today. I had to lengthen the wires as they werent quite long enough to make it to the deflection board. Powered it up and it looked like a million bucks right out of the gate! I got it adjusted to square off the pic, and put it back in the machine.
Apparently somone attempted to stick something in behind the windings. Wedge, screwdriver, etc. Anyhow, it looks as if a few of the windings have been bent and broken. Attached is a pic.

attachment.php


So there you have it! I figured Id post an end result for the next guy.
Thanks!

That's awesome! :D
 
Just wanted to thank everyone for the input and advice. I was able to locate a yoke from member EVB. Nice price and it fixed my problem. I was able to swap out the yokes today. I had to lengthen the wires as they werent quite long enough to make it to the deflection board. Powered it up and it looked like a million bucks right out of the gate! I got it adjusted to square off the pic, and put it back in the machine.
Apparently somone attempted to stick something in behind the windings. Wedge, screwdriver, etc. Anyhow, it looks as if a few of the windings have been bent and broken. Attached is a pic.

attachment.php


So there you have it! I figured Id post an end result for the next guy.
Thanks!

You know....with some patience, you could probably fix that.

Edward
 
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