JVC Model 200 service manual Optical System, Image Path

Chapter 2---System Description

•The Power Supply Section is located at the right front area of the projector below and to the rear of the Arc Lamp. It contains the Low Voltage Power Supply, the High Voltage Power Supply, and the Arc Lamp Power Supply.

•The Projector Electronics Section is located mainly in the back half of the projector. It consists of the Electronics Module that houses 6 of the electronics printed circuit boards used in the projector, and their associated cabling. It also contains the Backplane board which is used to electrically interconnect the printed circuit boards, power supplies and various other units in the projector and the Video Input Cards that interface with different kinds of input signals.

•The CRT Section is located beneath the electronics card cage and contains the 3 CRTs, 3 Relay Lenses, 3 ILA®s and the Video Amplifier Board.

2.2Optical System

Introduction: The Model 200 Optics Assembly divides white light from the Arc Lamp into its three color components, Red, Green and Blue. This light is then modulated with the image signal to form three single color images. The light is then recombined at the 4P (combining) prism and transmitted through the projection lens to the projector screen. The explanation below is divided into two sections. The first section follows the image path from the CRT to the projector screen. The second section follows the high intensity light path from the Arc Lamp Ignitor to the ILA® assemblies, where it combines with the image. The Red, Green, and Blue image and light paths are identical. Refer to Figure 2-1.

CAUTION! The alignment of system optical components is critical. Replacement of individual mirrors or prisms requires removing the projector cover and must be performed only by Hughes-JVC Certified technicians. Consult the factory before removing or aligning any mirrors or prisms.

2.2.1 Image Path

CRT Assemblies: The three CRT/Yoke assemblies are located beneath the Electronics Module card cage. Two exhaust fans at the rear help cool the CRT assemblies. Each CRT is sent a red, green, or blue signal, but they do not emit a red, green, or blue color, as in traditional projectors. The CRTs are not used as a

2-2 Model 200 Service Manual