Hi...

JN> Joe Paulson wrote to All:

JN> JP> All white images had a yellow tint no matter how
  > JP> I adjusted the COLOR,TINT,CONTRAST,GREEN-RED mix.

JN> White = Red + Green + Blue

JN> Compliment of Red is Cyan  --- RC Cola for a helping crutch
  > Compliment of Green is Magenta --- General Motors
  > Compliment of Blue is Yellow --- BYe, BYe

JN> Cyan = White - Red (or Green + Blue)
  > Magenta = White - Green (or Red + Blue)
  > Yellow = White - Red (or Green + Blue)

JN> Thus if you have a yellow tint, I'd suspect a low blue current.

It's been a loooong time; but if I recall correctly
those elderly zenith's had a setup switch on the
back, accessible without removing the cover.

It "pulls out" to operate. Three positions.
Fully in is normal operating mode.  One of the
steps as you pull it out kills the raster, the
other collapses vertical and kills video.

You should see at least one horizontal line
across the screen.  Perhaps two, maybe three.

What you're wanting to do is adjust the bias
controls, one for each color so that the
brightness of each line is identical, and just
barely visible.

If you can't get one or more to show; then
you'll want to increase the screen control
until the one(s) you can't see do just appear.

Then re-adjust until each is the same brightness
and just visible.

Push the service switch back in; the picture will
appear.  Now tune to a non existent station or
disconnect your cable; the picture should be
awful close to black and white snow.

Put it back on a station, turn the color
all the way down, brightness and contrast
to a nice viewing level.

Now turn the color back up to nice, adjust
the tint to nice.  If acceptable, then congrats.

However, if the tint control won't go "far
enough", or if it's not somewhere close to the
middle of its range, then get your shaving
mirror or your wifes' makeup mirror out.
Holler for someone to hold it for you.

Back behind the set, while someone holds the
mirror.  There are two more controls there,
only two colors.  With the tint control
approximately centered, tweak these until
both you and your mirror holder agree that
the picture is nice.

Seeing you (IIRC) mentioned focus, then while
you're there you may as well now do it too.
Off channel again or cable undone, brightness
the way you liked it.  While you tweak the
focus control you aren't looking at a picture,
you're staring closely (in the mirror of course)
at the scanning lines.  Oh, put a tiny piece of
colored tape dead center on the screen.
Now tweak the focus to get the sharpest
possible at the center.  The range will be
quite wide on the control.  Look at one of the
corners, it will almost certainly be blurry.
Tweak and look back and forth, center to corner,
keep it up until you get the best possible
compromise.

Good luck.

Ken

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