JVC 250 service manual YPbPr VIC - Service Adjustments, YPbPr VIC - Remove and Replace

Chapter 5---Electronics

interface. An operator selects the VIC and input in the Channels Menu (see section 4-6 in the User’s Guide).

The YPbPr VIC strips the sync pulses that are combined with the green image signal (Y in YPbPr mode) and sends them to the Video Processor PCB as a composite sync signal (H_SYNC). The Video Processor PCB separates the composite sync signal and sends it to the Raster Timing Generator PCB.

The YPbPr VIC also does signal processing in the YPbPr mode with the Tint, Color, and Sharpness options in the Picture Menu. The Tint control adjusts the tint of the colors displayed. Facial tones will vary from slightly green at zero to slightly red at 255. The Color control adjusts the amount of color saturation or color intensity. Colors will be almost grayscale at zero and very saturated at 255. The Sharpness control adjusts the high frequency peaking of the black and white details. These options are not available and are disabled in the RGB mode.

The YPbPr VIC has two LEDs. The RGB LED illuminates green when the YPbPr_VIC is in RGB input mode. The YPbPr LED illuminates green when the YPbPr_VIC is in YPbPr input mode. Only one LED will be illuminated at one time. Neither LED is illuminated when the YPbPr_VIC is not selected as the input to projector.

YPbPr VIC - Service Adjustments

There are no physical service adjustments to the YPbPr VIC

YPbPr VIC - Remove and Replace

Tools Needed

#0 Pozi-drive Phillips-head screwdriver

Parts Needed

YPbPr VIC p/n 106340

To remove the YPbPr 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 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 5-69