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16. CRT Set Up
CAUTION:
Insure yoke plugs on the A Board are reconnected before turning the
PTV ON to prevent damage to the horizontal output transistor and/or
CRTs.
1. Connect test generator to the antenna terminal and set for a
monoscope pattern.
2. Loosen yoke clamp, seat yoke against bell of CRT and rotate to
correct yoke tilt (compare to adjacent CRT). Tighten yoke clamp.
3. Remove adhesive from centering tabs and set centering tabs for zero
correction.
4. Cover replacement CRT lens and static converge the tubes not
replaced, if needed. Check size and linearity of pattern and adjust as
required
5. Uncover replacement CRT lens and cover other two CRT lenses.
Adjust electrical and optical focus (lens), if required.
6. Uncover all CRT lenses and use yoke centering magnet to converge
replacement CRT (in center area of screen only) with other two CRTs.
Disregard of convergence in areas other than center area.
7. Perform white balance adjustments.
16.1. Dynamic focus adjustments
1. Focus adjustments should be performed after 1 hour of aging.
2. Use oscilloscope with 100 : 1 probe.
3. Apply a NTSC crosshatch pattern to adjust focus.
4. Adjust the red, blue and green focus VR on the focus block for best
Adhesive removal
39
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