Chapter 5---Electronics

5.Remove the green CRT by loosening the green CRT Holder Ring (see Figure 5-29). Perform this step with the CRT Socket Connector still connected to the Green CRT and the ground wire still connected from the CRT/Yoke Assembly to the CRT Socket Connector. The Green CRT Socket Connector is close to the rear of the projector. It is easier to disconnect it from the CRT after the CRT/Yoke Assembly is loose and moved away from the rear of the projector (see CAUTION below).

NOTE: The holder ring should only be hand-tight. If it cannot be removed by hand, place a Flathead screwdriver in the slots on the CRT Holder Ring (see Figure 5-29) and tap lightly to help loosen it. Be careful not to let the Flathead screwdriver slip out of the slot and possibly damage components. Do not use a screwdriver or any other tool to tighten this ring. It should be hand-tight only.

CAUTION! The connections at the rear of the CRT are very fragile and can be damaged easily. Use extreme care when removing the CRT/Yoke Assembly to prevent damage to any CRT connections.

6.Carefully remove the Green CRT/Yoke Assembly by sliding it backward and upward as far as possible before disconnecting the Green CRT Socket Connector from the CRT neck. Use care to avoid bumping the CRT while removing it from the projector, to avoid damaging it. Also, be careful not to pull any of the wires that connect from the CRT Socket Connector to the Video Amplifier to avoid damaging them.

7.Move the Green CRT/Yoke Assembly away from the rear of the projector, then disconnect the Green CRT Socket Connector and the ground wire between the CRT/Yoke Assembly and the CRT Socket Connector.

NOTE: It may be helpful to perform this step with a partner-one person to hold the CRT/Yoke Assembly firmly and the other to remove the CRT Socket Connector and the ground wire.

8.Carefully lay the Green CRT Socket Connector on the top of the Video Amplifier PCB.

9.Place the Green CRT Assembly in a safe location on or against one of the other CRT Assemblies.

10.Disconnect the Red and Blue CRT Socket Connectors and carefully lay them on the top of the Video Amplifier PCB.

11.Disconnect the three connectors (push in slightly, squeeze the tabs, and pull out), J67, J68, and J69 from the Video Amplifier PCB (see Figure 5-28). Move the cables out of the way.

Model 250 Service Manual

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JVC 250 service manual Electronics