Hughes JVC 200, Руководство по обслуживанию

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Chapter 3---Service Adjustments
Vertical height pots.
Figure 3-8. Horizontal/Vertical Deflection Board.
To adjust the Vertical height ( see Figure 3-8 ):
Remove the rear cover ( Section 4.2) .
1. Select Test Pattern 5, X-hatch.
NOTE: Green is the master to which Red and Blue will be
matched. The Green height pot should not need adjustment
except when the Green CRT assembly has been replaced.
2. Hide Blue and view Red and Green.
3. If Red is higher than Green at the top and lower than Green at
the bottom of the X-hatch image, or If lower than Green at the
top and higher at the bottom, adjust Red vertical pot to correct
the error.
If Red is higher than Green at the top and bottom, or lower than
Green at the top and bottom, this is most likely caused by Red
not being centered correctly and can be corrected with the
centering adjustment (User’s Guide, Section 5.5.11).
If the Red height pot does not completely eliminate the
difference in height between Red and Green, balance the error
at the top and bottom. Too much of an error at the top or
bottom makes convergence procedures harder to accomplish.
4. Repeat Steps 2 and 3 above for Blue while hiding Red.
5. Recheck all Geometry and Convergence settings ( see User’s
Guide ) and readjust wherever necessary.
Model 200 Service Manual 3-13