Re: No red with WG K6100

CAUTION: A quick and dirty test to see if the guns of the tube are working
correctly is to simply GROUND the tab of each driver transistor (on the
neck board) to ground for a half second or so. This will force the gun to
go to maximum drive for that colour and you should see a solid GREEN, RED,
or BLUE line (Vector) or screen (raster) if the monitor is working normally.

CAUTION: With a vector machine you run the risk of blasting the phosphor
off the screen so make it really short time, perhaps a better test would be
to short two Colour drive transistor tabs together and see if you get a
colour blend (Red and Green make a Yellow line)

John :-#)#

At 11:25 AM 2/27/2000 -0800, you wrote:
> >
> > Have a small problem with a WGK6100 in my Black Widow. I am not
> getting any red on the screen. I can get red, but I have to turn the
> screen setting way up - so much in fact that I see the vector trace
> lines. I thought it might be the transistor in the red portion of the
> neck board - so I swapped it out - no luck. Reading Greg Woodcock's
> repair faq on Gamearchive, he said:
> >
> > No red; check:
> > on neck board:
> > R500 (open)
> > R502 (shorted to nearby component)
> > R510 (open)
> > R511 (open or wrong value)
> > R520 (open; red color can be seen but is very weak)
> > R529 (open or wrong value)
> > broken wire at R517 control
> >
> > All are fine with the exception of R529. The schematics say it should
> be a 12K ohm resistor. But mine reads around 3K. I checked R530 and
> R531 (which should also be 12K according to the schems) - they read
> around 3K also. Finding this a bit odd - I checked the resistors on the
> neck board on my Tempest and they also read around 3K. So I assume that
> they resistors are correct. Just curious why they differ from the manual so.
> >
> > Anybody have any ideas as what else I should check? I have a feeling
> the red gun needs to be boosted - but before I have that done I wanted to
> check with somebody else first. Thanks!
> >
>
>Walt,
>
>I had this exact same problem with my Major Havoc a couple of months
>back. From the advice of a fellow collector, I simply adjusted the
>red connector pin on the main connector between the monitor board and the
>game board (the red wire that comes from the game board to the monitor
>board that is part of that molex(?) connector) by first using a small
>screw driver to bend the pin open a bit and then pushing the pin in to the
>plastic connector (it had become slightly pushed out somehow). I did this
>and have had no problems since. I hope that makes sense...if it doesn't,
>just email me privately and I'll try to describe what I did more
>clearly:).
>
>Hope that helps!
>
>Jonathan
>
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  John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
  Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
  http://www.flippers.com
         "Old pinballers never die, they just flip out."

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Received on Sun Feb 27 16:45:10 2000