Horizontal Size Settings; Floor/ Ceiling Jumper Setting (Vertical Scan Reverse) - Hughes JVC 100 Service Manual

Table 3-1 Projection orientation jumper settings.
ORIENTATION
Front / Floor
Upright
Front / Ceiling
Upside Down
Rear / Floor
Upright
Rear / Ceiling
Upside Down

Floor/ Ceiling Jumper Setting (Vertical Scan Reverse)

The Ceiling/Floor jumpers invert the image vertically for use in some situations
that use mirrors or ceiling projections. Figure 3-10 illustrates the location of the
jumpers on the Vertical Convergence Deflection PCB. The Model 100 Projector is
shipped in the upright vertical projection position with the jumper plug inserted
into CN713. For an upside down vertical setup this jumper plug must be inserted
into CN714. (see Table 3-1 for other orientations).
To invert the vertical image:
1. Turn power off at the projector and wait for the arc lamp to cool.
2. Remove the Electronics Module cover (see Section 3.2).
3. Verify that the vertical jumper is inserted into CN713 for upright vertical
operation (see Figure 3-10 and Table 3-1). Remove the connector from
CN713 and insert it into CN714.
NOTE: The Vertical Convergence Deflection PCB does not need to be
removed from the Electronics Module to change these connections.
4. Replace the Electronic Module cover.
5. Restart the projector.
6. When changing jumpers for floor or ceiling screen projection, Centering,
Convergence and Shading must be rechecked.

3.7 Horizontal Size Settings

The Horizontal Adjustment Coils are located on the front of the Horizontal
Deflection PCB. These coils are used to make coarse adjustments for horizontal
size. Adjust the horizontal size coils when replacing the Horizontal Deflection
PCB, or CRT Assembly. These adjustments may also be needed when the
convergence adjustment procedures fail to bring the colors into convergence.
Model 100 Service Manual
Front / Rear Floor / Ceiling
Convergence.
Jumper
CN708
CN707
CN707
CN708
Chapter 3---Service Adjustments
Horizontal
Vertical. Scan Reversal
Jumper Jumper
CN713 CN702
CN714 CN701
CN713 CN701
CN714 CN702
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