Hughes JVC 200, Service Manual

Page: 91 / 140

Chapter 3 Service Adjustments
2. Remove the projector rear cover ( Section 4.2 ).
3. Verify that the jumper is plugged into JA50 and J101 for rear
projection or J50 and J100 for front projection ( See Figure 3-7 ).
Change jumper if necessary.
4. Replace the projector cover.
5. When changing jumpers for front or rear screen projection,
Centering, convergence and shading must be rechecked.
3.9.2 Inverted Vertical Jumper Setting
The Ceiling/Floor jumpers invert the image vertically for use in
situations using mirrors or ceiling projections. Figure 3-7 illustrates
the location of the jumpers on the Scan Reversal Board and
indicates the proper location for ceiling or floor projection. The
Model 200 Projector is shipped in the normal vertical projection
position with the jumper plug inserted into J53. For an inverted
vertical setup this jumper plug must be inserted into J53A. (
Refer to
Figure 3-7 ).
To invert the vertical image:
1. Turn power off at the projector and wait for the arc lamp to cool.
2. Remove the projector rear cover (Section 4.2).
3. Tilt the electronic module up (Section 3.3).
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.
3.10 Vertical and Horizontal Size Settings
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.
3-12 Model 200 Service Manual