JVC 250 Graphics Enhancer Plus VIC - Operation, Graphics Enhancer Plus VIC - Service Adjustments

Chapter 5---Electronics

Graphics Enhancer Plus VIC - Operation

The RGBHV VIC receives the separate red, green, blue image inputs and horizontal, and vertical sync inputs from the source input device. The image signals go to a image enhancement signal processor that peaks the black details, enhances white details, and minimizes white overshoot according to commands received from the IIC data bus from the System Controller PCB. The commands are generated by an operator through the Black Enhance and White Enhance commands in the Picture Menu. The graphics enhancements are for black text and graphics on a white background.

The processed red, green, and blue image signals are sent to the Video Processor PCB. The horizontal and vertical sync pulses go straight through the VIC to the Video Processor PCB without modification.

The VIC receives a SELECT command from the System Controller PCB through the IIC data bus to activate the VIC. The VIC sends a /SEL_VIC signal to an internal Input Switcher (Mux) on the Video Processor PCB. This tell the Video Processor PCB which VIC is selected. An operator selects the VIC in the Channels Menu (see section 4-6 in the User’s Guide).

A green LED is illuminated when the VIC is selected.

Graphics Enhancer Plus VIC - Service Adjustments

There are no physical service adjustments on the Graphics Enhancer Plus VIC

Graphics Enhancer Plus VIC - Remove and Replace

Tools Needed

#0 Posi-drive Phillips-head screwdriver

Parts Needed

Graphics Enhancer Plus VIC p/n 106183

To remove the RGBHV VIC:

1.Power off the projector by IR Remote or PC, and allow the cooling fans to run until they shut off automatically.

2.Turn the AC Circuit Breaker to the OFF position and unplug the AC Power Cord.

3.It is not necessary to remove the rear cover.

4.Disconnect the red, green blue, horizontal and vertical input BNC cables from the VIC.

5.Remove the two retaining screws from the faceplate of the VIC.

6.Pull the VIC out of the Electronics Module.

7.Reverse the process to install the VIC.

Model 250 Service Manual 5-63