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Chapter 5---Electronics
5-58 Model 250 Service Manual
NOTE:
For the Green CRT/Yoke Assembly only, it is best to perform
Step 10 with the CRT socket connector still connected to the Green CRT
and the ground wire still connected from the CRT to the socket connector.
Because the Green CRT socket connector is close to the rear of the
projector, it is easier to disconnect the socket connector from the CRT
after the CRT/Yoke Assembly is loose and moved away from the rear of
the projector. Be careful not to break any of these connections.
CAUTION!
Use extreme caution to avoid bumping
the CRT/Yoke Assembly while removing it (
see Warning at the
beginning of this procedure
).
11. After removing the CRT/Yoke Assembly, carefully disconnect the CRT
socket connector and the ground wire that connects the CRT to the socket
connector.
NOTE:
It may be helpful to have another person assisting for step 9. One
person can disconnect the CRT socket connector and ground wire, while
the other person holds the CRT/Yoke Assembly firmly.
12. After verifying that all cables are out of the way, remove the CRT/Yoke
Assembly from the projector.
13. Reinstall the CRT/Yoke Assembly in the reverse order.
NOTE:
When reinstalling the CRT/Yoke Assembly, plug the CRT ground
wire into the CRT Socket Connector first, then partially plug the Green
socket connector into the CRT. Inserting the CRT fully into the socket
connector will be easier when the CRT is completely installed.
14. Perform a CRT Mechanical focus adjustment and CRT Rotation after
replacing the CRT/Yoke Assembly. Because replacing the CRT/Yoke
Assembly can disturb other focus adjustments, check the CRT Mechanical
Focus on the other two colors to verify that they are still correct.
15. Check the on-screen horizontal size and adjust the Horizontal Size
Adjustment Coils on the Scan Reversal PCB if necessary.
5.11 Video Input Cards (VICs)
The VIC is the interface between the input source and the projector. Several input
source format are accepted such as separate RGBHV, Composite, YPbPr, and S-
Video.
The Model 250 accepts six different VICs;
!
Wide Bandwidth RGBHV (Standard)
!
Graphics Enhancer Plus RGBHV(Standard)
!
4-Input (Quad) RGBHV (Optional)