Sega Outrun WG K7000 Monitor No Red

Tom in NoVA

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Hello All,

I have a Sega Outrun and the monitor shows no red. If I turn the brightness up, I get a white screen, so I think the picture tube is OK and I have a chassis issue. I did a cap kit and still do not have the red color. The Green and Blue can be adjusted with the trim pots on the back of the flyback, but I get nothing out of the Red adjustments.

I used a jumper to ground the red transistor and did not get any change on the red. I had expected full red, but got nothing.

This is a WG K7000 with a 19 inch monitor. The flyback has white adjustment knobs, which I read in K7000 help section the as being the older, more problematic style.

Is there a step by step guide somewhere on what best to check. For clarity, this is my only video game, the rest of my games are pinball machines.
 
no red

It takes red,green,blue to make white on these monitors. If you have no red in your video then check the plug and wiggle the plug and red wire to see if you get your red video. these do get crack solder joints underneith the video plug.
Measure your video voltage and see if you have approx. .8 to 2volts dc for each r,g,b. if not on the red then you have wiring or game board problem.
Try moving your blue drive transistor on your neck board to the red transistor spot and see if you have your red now.
If you have your meter you can check your transistor first and see if they check the same.
gun is bad in tube. maybe it can be rejuved.
 
if you grounded the red transistor and got nothing then you're probably looking at a bad transistor, or perhaps bad solder joints. for your own personal amusement you can desolder the red and either the green or blue transistors and swap them around and see if there's any change (ie: green goes missing if you switched with green)

if you're lucky, you'll get all the colors working cause maybe it was a bad solder joint on the red (I've had this happen before on a couple WG D9200s)

K7000s are prone to the solder joints developing cold solder. I've worked on 3 of them now and never encountered such a problem, but it can happen to anything.

white knob flybacks can either run fine, today, or they can go kablooey tomorrow. I had one that exhibited no strange symptoms like erratic brightness or unadjustable focus and it just blew on me one day, and put a dime-sized hole in my chassis to boot.

some people have said they never had problems with flybacks on them... but they're probably speaking as if it's 1990 still. if you can spare the $20 or so for a new flyback go get it.
 
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