Space Invaders Montitor Help

iowasoxfan

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I have a Space Invaders Deluxe Monitor that has been re-capped. The screen is backwards left to right. Wonder if there is a wiring problem with the yoke or a plug in the wrong place on the board. Standing in the back looking in, the four wires running to the yoke are red & purple (closest to coin door - left to right) and yellow & black closest to the back.
Don't know if it is a curling issue. a picture of the screen in attached. WG 19v1001a.
 

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swap the horizontal yoke wires. I'm unsure if that is the red/purple or the yellow/black BUT only swap them within pairs IE reverse the red/purple or the yellow/black - don't mix them.

That will fix your problem as the horizontal is simply scanning the wrong way - it's no biggie
 
The next step

Thanks, for the quick reply. I tried your suggestion. when I switched the rep and purple, I got a horizontal line. When I switched the yellow and black, I got a vertical line. Any other ideas?

I did notice that there are sets of plugs at NW, NE, SE and SW if the coin door was due North. however, I am using the NW and SE plugs and the NE and SW plugs are not used. Do you think that makes difference?
 
You need to locate the two wires that are the connections to the horizontal yoke winding and reverse them. Use a multimeter to determine which winding has the lowest resistance and that will probably be it. It could be that the other connections you mention reverse the windings for you when you use them - I'm unsure.

Easiest to determine which winding is which with a meter rather than risk damaging the chassis.
 
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Thanks, for the quick reply. I tried your suggestion. when I switched the rep and purple, I got a horizontal line. When I switched the yellow and black, I got a vertical line. Any other ideas?

You should only swap the black/red........and the yellow/gray (purple) wires.

You swapped the wrong wires. That's very bad to do. Hopefully you didn't destroy the vertical deflection circuit.

Edward
 
You should probably put it back the way it was to see if you still have that flipped image you originally had. If you do then you can swap the wires like Elutz said red with black and yellow with gray (I think the wire that you are calling purple Wells Garner considers gray. It does kind of look lavender though)
 
Ended up swapping the yellow & gray/purple wires and screen orientation is fine now. Adjusted the B+, +5, -5 and +12; all is well there. The picture is still stretched on the left side, and compressed on the right. Adjusting the VERT size helped, but not much. Anything else that should be checked/tested/replaced? Thanks
 
Ended up swapping the yellow & gray/purple wires and screen orientation is fine now. Adjusted the B+, +5, -5 and +12; all is well there. The picture is still stretched on the left side, and compressed on the right. Adjusting the VERT size helped, but not much. Anything else that should be checked/tested/replaced? Thanks

The Wells-Gardner V1000 series monitors have a vertical linearity pot (some versions have two). That should adjust out the issue you're seeing (assuming nothing is bad in the vertical deflection circuit).

Edward
 
almost there....

Located the VLIN1 and VLIN2 pots (there were two on this WG19v1001) - they helped a *bit* dialed both from one extreme to the other...still squashed video on the right side (facing the front)...any ideas?
 
WE tried a second (albeit uncapped) chassis and had the exact problem. Adjusting the VLINs didn't work, how ever the VERT hold had two "sweet spots" where the pic would stop scrolling....had to adjust the knob a bit to go from one stable screen to the other.
 
SI Deluxe Monitor

Could a cap be the issue here? Or maybe one of the transistors? Tried every adjustment pot on the chassis and the right side (almost split down the center) is still "squashed", while the left is spread out normal.
 
WE tried a second (albeit uncapped) chassis and had the exact problem. Adjusting the VLINs didn't work, how ever the VERT hold had two "sweet spots" where the pic would stop scrolling....had to adjust the knob a bit to go from one stable screen to the other.

Check to see if your yoke is cocked to one side a little. As there is no real convergence on B/W monitors, you don't have to really be afraid of loosening the yoke a little and GENTLY (GENTLY!) moving it a little to see what you can do.
 
Thanks Scucci - never thought of adjusting the yoke. Will try that. Picked up a working pull from a friend and may use that for now, but will keep on troubleshooting the other (I don't accept defeat very well ;-)
 
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