"Simple Color TV Adjustments Part II: Internal Adjustments"
By Fred Rodney.
Spring 1984.

COLOR PURITY:

Degaussing: This is the simplest adjustment that can be made. The purpose is to 
remove any residual magnetism that may have been induced onto the picture tube 
bell. The magnetism of the earth is strong enough to do this whenever the set 
is moved. On newer sets, degaussing is done automatically each time the set is 
turned on. Inside such sets, a coil of wire can be seen around the picture tube 
near the screen. On older sets, degaussing is done externally with a degaussing 
coil or a soldering gun (not the pencil type). The TV may be on or off. Rotate 
the degaussing coil or gun around the front of the picture tube. If the color 
is still impure, internal adjustments must be made. Note: degaussing is the 
same as "de-magnetising" and so must be done with an A.C. electromagnetic 
device such as a degaussing coil or an A.C. soldering gun. Do not use a 
permanent magnet!

Color Purity: Keep one hand in your pocket whenever you reach inside any TV 
whether it is on or off!

1. Remove TV back and connect a "cheater" cord. Turn TV on.
2. Using the Astrocade "Scribbling" game, press the WHITE color button
   until the screen turns red.
3. Press the Astrocade's INTENSITY button for a bright screen.
4. If the color is off in the center of the screen: adjust the purity
   tabs on the neck of the tube. Try turning both. If the impurity
   doesn't clear, adjust separately.
5. If the color is off on the fringes or corners, loosen the deflection
   yoke (on picture tube neck) and move it slightly up or back until the
   color is uniform. Retighten.

[Picture Labeled:
Color Purity Tabs - Similar to black & white centering tabs
TV Picture Tab - from socket (rear)
Reflection Yoke - Large coil on tube neck- (try adjusting tabs first)]