Projector Service Manual
Table Of Contents
- DECLARATION OF CONFORMITY
- BZSAFE.PDF
- CH1INTRO.PDF
- CH2SYSDE.PDF
- Functional Descriptions
- Contents
- Cover and Base
- External Power Requirements
- Electronics Systems Overview
- System Power
- Card Cage
- Circuit Boards
- Raster Timing Generator Board (RTG) p/n 100568
- Sync Generator
- Sync Detector and Selector
- Serration and Equalization Lockout
- Phase Locked Loop
- VSYNC Detector, Field Separator, and Mux
- Adjustment Counters
- Serial Communication
- Raster Timing Generator I/O
- Interlocks and Protection
- Horizontal Deflection Board P/N 102523 (HDB)
- Vertical Oscillator
- Horizontal Phase Locked Loop
- Horizontal Centering
- Horizontal Power Supply
- Flyback Switching
- Geometric Correction
- Output Section
- Horizontal Sweep Failure Detection
- Serial Communication
- Horizontal Deflection Board I/O
- Interlocks and Protection
- Vertical Deflection Board P/N 102521(VDB)
- Vertical Preamps
- Vertical Amplifiers
- Sweep Failure Detection
- Side Pincushion and Keystone Correction
- Horizontal Linearity Correction
- Top and Bottom Pincushion and Keystone Correction
- Correction Amplifiers
- Serial Communication
- General I/O
- Interlocks and Shutdowns
- Video Processor Board P/N 104672 (VPB)
- Decoder
- Video/Sync Mux
- V & H Sync Strip
- SG Sync Strip
- B, G, and R Brightness and Contrast Amplifiers
- On-Screen Switch
- Gamma Correction
- Switch Logic and Video Enable
- RGB Sensitivity and Threshold Amplifier
- ILA® Bias
- Dynamic Focus Amplifier
- Serial Communication
- General I/O
- Interlocks and Protection
- Video Amplifier Board P/N 103567 or 103774 (VAB)
- Video Signal
- Failure Detection
- Beam Current Sense
- DC Restore
- Arc Protection
- Blanking
- Enable Circuit
- Focus
- Filament Supply
- General I/O
- System Controller Board P/N 104668 (SCB)
- General Functional Description
- CPU
- Working and Compressed Memory
- Expanded Memory
- Correction Address Generator
- DACs
- DSP
- Overlay Memory
- Overlay Address Generator
- Overlay Interface
- LED Display Buffers and Logic
- RS232 Interface
- IR Interface
- IIC Interface
- Serial Interface
- General I/O
- Backplane Board p/n 100571
- Optical Section
- Image Light Amplifier
- Functional Descriptions
- CH3ADJST.PDF
- CH4MAINT.PDF
- Maintenance Remove/Replace)
- Contents
- Introduction
- Projector Covers
- Ventilation Filters
- Arc Lamp Assembly
- System Power Supply
- Electronics Module
- Cathode Ray Tube (CRT)
- Video Amplifier Board (VAB)
- CRT Yoke
- High Voltage Power Supply (HVPS)
- Card Cage (Printed Circuit Boards)
- Image Light Amplifier Assembly
- Projection Lens
- (SCB) Socket Battery Replacement
- Recommended Spares
- Maintenance Remove/Replace)
- CH5TRBSH.PDF
- HGLOSS.PDF
Chapter 2—Functional Descriptions
2-72 Model 330. 340SC, and 370SC Service Manual
Figure 2-18
Backplane Interface Block Diagram
2.7 Optical Section
The Optical section consists of the CRT Assembly, the Arc Lamp Assembly, and
the Optical subassemblies, which provides the image to be viewed on the screen.
The Optical Section filters, splits and directs the high intensity light to the three
(3) separate (RGB) light channels. Figure 2-19 shows the video path from the
CRT to the screen and the optical path from the Arc Lamp to the screen.
CRT Assembly
The image in the projector begins at the three (3) CRTs. The CRT Assembly is
located beneath the main electronics card cage and contains three (3) sets of the
following:
CRT tubes.
CRT cooling assemblies.
CRT Yokes.
Yoke clamps.
Video Amplifier Boards.
Each CRT has a high resolution infrared beam and a high resolution phosphor
screen. Fans mounted at the rear of the assembly cool the CRT Assembly.
Procedures for adjusting the yokes and the width coils can be found in
Section.3.2. A functional description of the Video Amplifier Boards is provided in
Section 2.6.5.
Relay Lens
The relay lens picks up the CRT image from the face of the CRT and focuses the
image to the ILA
®
assembly.
Image Light Amplifier (ILA
®
) Assembly
At the same time as the image is received at the input side of the ILA
®
assembly,
the output side of the ILA
®
assembly is receiving high intensity light from the arc
lamp through the prism. This high intensity light is then phase modulated (altered)
by the video signal from the input side of the ILA
®
assembly and then reflected
back out of the output side and then travels through the prism to be picked up by
the projection lens.
NOTE:
The prism reflects horizontally polarized light and passes vertically
polarized light. Light from the arc lamp is polarized horizontally and reflects from
the prism into the ILA
®
assembly then back out again, after being phase
modulated 90° to vertical by the Liquid Crystal layers into vertically polarized