Raster Timing, System Controller, Video Processor Pcbs - Hughes JVC 220 Service Manual

Chapter 4---Maintenance (Removal/Replacement)
4.9 Raster Timing, System Controller, Video Processor
PCBs
NOTE: To remove connectors on the printed circuit boards in the
sections below, push the connector in slightly, then squeeze the
tab and pull the connector out.
4-12
14. Grasp the HVPS at the bottom and lift upward and
outward so that it slides away from the bottom screws.
15. Reinstall the HVPS in the reverse order from above.
When reinstalling, be sure that the HVPS slides over
the bottom screws and the lip at the top of the projector
frame. Make sure each anode cable "snaps" back into
its receptacle. The receptacles are about 2" inside the
hole where the cable fits into. Also, be sure the rear
flap on each focus cable connector snaps over the
square socket securely-wiggle the connector a little to
make it fit over.
16. Replace the HVPS cover. After the HVPS is replaced,
recheck CRT Mech Focus, Yoke Alignment, G2, and
Electronic Focus.
17. Replace the projector covers.
All electrical connections to the Raster Timing Generator, System
Controller, and Video Processor boards are routed through the
backplane board. There are no connectors to remove.
To remove the Raster Timing Generator, Video Processor, or
System Controller PCBs:
1. Turn off power at the remote control and at the circuit
breaker on the projector rear panel.
2. Remove the projector rear cover.
3. For the Raster Timing Generator and Video Processor
PCBs, grasp the card extractor tabs at both ends of the
boards and pull out. To remove the System Controller
Board, use a small, flathead screwdriver and remove
the screw in the bracket in the center of the System
Controller Board (this bracket holds the SCB to the
card cage). Grasp the bracket and pull out the SCB.
4. When replacing boards, verify that power is off at the
circuit breaker, the power plug is disconnected and
there are no bent pins on any connectors. Make sure
the board is properly and securely seated before
reapplying power.
Model 220 Service Manual