What causes this issue (screen cannot go further to the right)

john rainbo

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What causes this issue (screen cannot go further to the right)

I wanted to start a thread that deals with only this issue. I'm confused. It's a K7000. The right side of the monitor has a dead zone that nothing can surpass it. I can make it larger with the width coil, but that never actually fixes it... you can still see a bright line going down the entire right side of the screen. If i use the horizontal position pot, and make the whole picture go to the right, the screen just disappears into this nothingness, only to be turned into bright light. What can be done to fix this issue?
 

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I had the opposite problem. My screen was to wide. My chassis is a Wei-ya replacement for the k7000. Mine had or has jumpers for (N) narrow and (W) wide. After changing the jumpers I was good to go. Hope this helps.
 
Hmm, I can make it wider with the width coil. In fact, when I got it it WAS too wide. I think they did this to hide the stupid issue that it clearly has. Nice fix. Make the screen so wide that you won't see the problem 'cause it's off the screen (along with the game I want to see).
 
There is a horizontal position jumper on the chassis. It is near the back behind the flyback/HOT. Try moving the jumper over to move your pic over.
 
Have you replaced the caps and reflowed the chassis yet? I've seen this issue before, and usually a cap and reflow takes care of it...
 
I just redid the caps... all of them. Still nothing. I even replaced ones that were just replaced by the last guy. So, I'll try this jumper, now. Not sure what to look for.

Found one that says horizontal position.... L C R. It's on C now. So, not sure why putting it right or left would help. Unless, there's another one for Wide and Narrow? I can't seem to find that one.
 
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well, I adjusted that wire from center to right, then from right to left... didn't do much, sadly. The issue is still there. :( The side just eats the picture. :(
 
Moving it to the 'R' position should shift the entire pic to the right.


Is this a problem with both sides or just the right? Have you tried a different circuit board (game board) to see if the problem persists?

The last option is to reposition the yoke, but that requires a bit of luck and a ton of patience...
 
if that douchebag cadillacman wouldve engineered and built a new chassis for it instead of repairing it 9 months ago it would be ok!! :D
 
horizontal position

check your resistors.....in the horizontal section....you will find one has increased in value causing your issue. Check around r90 or r92, both 1.2 ohms.....see if one hasn't gone higher(sorry, doing this from memory) Good luck.......
 
check your resistors.....in the horizontal section....you will find one has increased in value causing your issue. Check around r90 or r92, both 1.2 ohms.....see if one hasn't gone higher(sorry, doing this from memory) Good luck.......

Hmm, r90 or 92? This is the best lead I've had yet. I will check. Since you're going by memory, any place I can check on the net that will have the full list of the resistors that run in the horizontal section? Just to be anal, I can replace them all!
 
not like it really pertains to the matter at hand, but I have the same problem with a K8000 lol

what's considered the "horizontal section", right around the width coil and such?
 
Cap C38 determines the overall width, so if you adjusted the monitor all the way out, you might try changing the value of that cap.
 
I don't care about how wide the pic is, I care about what is at the side. I'm guessing changing that would only change the size, but not fix the edge that is missing.

I'm going to change out those resistors and go from there.

As for the resistors... I know the ohm, but what's the wattage?
 
Okay, so I tested those two (and other) resistors... they all are the normal ohms. Uh oh... I mean, that's nice, but I was hoping one of them was going to be bad.

So, I just randomly started testing the resistors in the horizontal section (I'm guess, as they are near the horizontal coil). And I come across the resistor RIGHT NEXT to the width coil. It's R99 rated at 2.2. This one is coming up at a whopping .2 to .3. So, what does this mean?? Could this be my problem? I know jack shit about resistors... but clearly this one's way low. What do we think?

EDIT: Turns out that R98 is the same value. Only around .3, and also smack dab next to the width coil.
 
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It's R99 rated at 2.2. This one is coming up at a whopping .2 to .3. So, what does this mean?? Could this be my problem? I know jack shit about resistors... but clearly this one's way low. What do we think?

To properly test a resistor it needs to be out of the circuit. Desolder one leg and lift the leg from the board and retest.

When resistors fail they tend to go open (infinite resistance) instead of go short (zero resistance). So, if you find a resistor in that section with a much higher resistance then spec, its bad. Don't forget resistors have tolerances (+ or -) of their listed value.
 
Oh really? So, the ones I tested fine may not if I take the leg off? I find it odd that they match up perfectly with the rating they are supposed to be. Does it matter which leg?
 
Those two resistors are parallel to other components, they have to be removed (one leg desoldered and lifted is the easiest way) in order to test correctly as stated above.
 
Yeah, I did that for all of the ones I tested. They're all fine. :( :(

Just for the heck of it, I plugged this into a different monitor... same thing. So, it's not the tube, either. And it's not the game, as I tried a different game on this cab. I just don't know.

I'm out of ideas!
 
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