Yet another Zenith To identify

[zeno]

Chromatic switch works like this.
OFF ( not red ) works off the normal controls for brite, color, tint
& picture ( contrast ). You can adjust them by hand.
ON ( RED ) turns all those controls OFF. The 4 controls are hollow
& have a duplicate screwdriver control behind the regular control.
When ON you adjust for best pix. It also turns on ATG
( auto tint guard ) that has nothing to do with your troubles.
For now just run it in off.

If you havent check the long package on the 9-88-? They were a
"check EVERY ONE" for cold solder. Most had cold joints after a few yrs.
The 9-89 probably is OK & almost any problem is related to one
color. IIRC it had just the video out & 3 color out transistors.

We refer to short hand module part numbers. Keep in mind many are
newer versions and have more numbers like 9-88-01, 9-90-02,
150-190-01 etc. You need them to get the RIGHT replacements !

Lastly with good grey scale & the G-2 controls at about 25%
you have a as new or nearly CRT.

73 Zeno