Vertical And Horizontal Size Settings - Hughes JVC 220 Service Manual

3.10 Vertical and Horizontal Size Settings

Model 220 Service Manual
4. Verify that the vertical jumper is inserted in the correct jacks for
appropriate application, (see Figure 3-7). Change jumpers if
necessary.
5. Replace the electronic module and rear cover.
6. When changing jumpers for floor or ceiling screen projection,
Centering, convergence and shading will need to be rechecked.
Adjust the vertical height pots and horizontal size coils when
replacing the Horizontal/Vertical Deflection board, Scan Reversal
board, or CRT/Yoke assembly. They may also be needed when the
convergence adjustment procedures fail to bring the colors into
convergence.
Figure 3-8. Horizontal/Vertical Deflection Board.
To adjust the Vertical height (see Figure 3-8):
1. Remove the rear cover (Section 4.2).
2. 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.
3. Hide Blue and view Red and Green.
4. 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
Chapter 3---Service Adjustments
3-13