Hughes JVC 100, Service Manual

Page: 79 / 127

Chapter 3---Service Adjustments
3-16 Model 100 Service Manual
Figure 3-11
Horizontal Deflection Board.
To adjust the horizontal size coils (see Figure 3-11):
1. Remove the Electronics Module cover.
2. Apply power to the projector and allow to warm up for a minimum of 15
minutes.
3. Use Test Pattern #5 (the X-hatch test pattern).
4. Clear X and Y Convergence Data (Convergence Menu / Reset /
Registration).
5. Set all the Horizontal Sizes to 128 (Geometry Menu / Size).
6. Hide the Blue Channel. View the Red and Green Channel.
7. If Red is outside of Green on both sides, or inside of Green on both sides,
use a Delrin .100 hex alignment tool to adjust the Red horizontal size coil
to correct the error. If Red is outside of Green on one side and inside of
Green on the other side, this is most likely caused by Red not being
centered correctly and can be corrected with the centering adjustment
(User’s Guide, Chapter 5).
If the Red horizontal size coil does not completely eliminate the size error
between Red and Green, balance the error on both sides to allow for easier
convergence.
8. Repeat Steps 2 and 3 above for Blue while hiding Red.
9. Recheck all Geometry and Convergence settings and readjust wherever
necessary.
10. Replace the Electronic Module cover.
Heat Sink
Heat Sink
Capacitors
Horizontal
Size Coils
CN002 Goes to
CN702 / CN701