JVC 250 service manual Input Quad Rgbhv VIC Outputs, Input Quad Rgbhv VIC Operation

Chapter 5---Electronics

4-Input (Quad) RGBHV VIC - Outputs

RED_VIC - red image to the Video Processor PCB (0.7-1.0 Vpp).

GRN_VIC - green image to the Video Processor PCB (0.7-1.0 Vpp).

BLU_VIC - blue image to the Video Processor PCB (0.7-1.0 Vpp).

H_VIC - horizontal sync to the Video Processor PCB

V_VIC - vertical sync to the Video Processor PCB

/SEL_VIC - VIC select line to the Video Processor PCB

4-Input (Quad) RGBHV VIC - Operation

The 4-Input (Quad) RGBHV VIC accepts four sets of RGBHV inputs. It has a Multiplexer (switcher) that selects one set of RGBHV inputs at a time. The VIC receives a SELECT command from the System Controller PCB through the IIC data bus to activate the VIC and select an input. The VIC sends a /SEL_VIC signal to an internal Input Switcher (Mux) on the Video Processor PCB. This tells the Video Processor PCB which VIC is selected and which set of inputs is selected. An operator selects the VIC and input in the Channels Menu (see section 4-6 in the User’s Guide).

A green LED illuminates when the VIC is selected.

The 4-Input (Quad) RGBHV VIC uses two VIC slots.

4-Input (Quad) RGBHV VIC - Service Adjustments

There are no service adjustments on the RGBHV VIC

4-Input (Quad) RGBHV VIC - Remove and Replace

Tools Needed

#0 Posi-drive Phillips-head screwdriver

Parts Needed

4-Input (Quad) RGBHV VIC p/n 103668

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

5.Remove the four 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.

5-66 Model 250 Service Manual