Jumper Settings; Front/Rear Jumper Settings - Hughes JVC 220 Service Manual

3.9 Front/Rear or Inverted Projection Jumper Settings
3.9.1 Front/Rear Jumper Setting (Horizontal Reverse)
Model 220 Service Manual
2. Loosen the 2 wing nuts at the top of the ILA
adjusted (Figure 4-12).
3. If the overlap is at the left or right, grasp the ILA
slide it to the right or left so that the edges coincide with the
edges of the other two ILA
damaging the connector, grasp the ILA
the connector at the top.
4. If the overlap is at the top or bottom, be sure the projector is
level, then slide the spring clip (Figure 4-12) at the top of the
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ILA assembly backward and remove the ILA
slide out with some resistance). Observe there are two
adjustment screws at the bottom of the ILA
allow for up and down movement. Turn these screws in or out
very slightly to allow the ILA
whichever is needed.
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5. Reinstall the ILA
6. Repeat Step 4 if adjustment is still needed.
7. Retighten the 2 wing nuts.
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8. Reset the ILA biases to their previous levels from Step 2.
The Horizontal Scan Reversal Jumper reverses the image
projection for front or rear projection. Figure 3-7 illustrates the
jumpers' location on the Scan Reversal Board, and the proper
location for front and rear projection.
The Model 220 Projector is shipped with the jumper plugs inserted
in J50 and J100 for front projection. For a rear projection setup,
these jumpers must be inserted into JA50 and J101.
Chapter 3---Service Adjustments
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assemblies.
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to seat lower or higher,
assembly and replace the spring clip.
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assembly to be
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assembly and
CAUTION!
To avoid
assembly itself, not
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assembly (it will
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assembly which
3-11