JVC Model 200 service manual Video Amplifier PCB

Chapter 4---Maintenance (Removal/Replacement)

2.Remove the 2 flathead screws that secure the VIC to the projector rear panel.

3.Grasp the VIC connector bracket and pull the VIC out (Wiggle the VIC a little, if necessary, to extract it).

4.12Video Amplifier PCB

The Video Amplifier PCB for the 3 CRTs is located under the Electronic Module, on the bottom frame of the projector behind and under the CRT assemblies.

To remove a Video Amplifier PCB:

1.Remove the front and rear covers (Section 4.2).

2.Tilt the Electronic Module up (Section 3.3).

3.Loosen the Green CRT Holder Ring (knurled knob-see Figure 3-5). Read the Caution below this step before removing the CRT Holder Ring completely. NOTE: The holder ring should only be hand-tight. If it cannot be removed by hand, a flathead screwdriver can be used in the slots on the CRT Holder Ring (Figure 3-5) to help loosen it. Use care 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! This step is performed 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. This is because the Green CRT Socket Connector is close to the rear of the projector and is easier to disconnect from the CRT after the CRT/Yoke Assembly is loose and is moved away from the rear of the projector. Use extreme care not to break any of these connections when removing the CRT/Yoke Assembly.

4.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 as it is being removed and to avoid breaking any of the wires that connect from the CRT Socket Connector to the Video Amplifier.

5.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.

6.Gently lay the Green CRT Socket Connector on the top of the Video Amplifier PCB.

4-14 Model 200 Service Manual