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 3---Service Adjustments
3-8 Model 330, 340SC, 370SC Service Manual
8. After Yoke rotation, readjust Geometry, Convergence and CRT
Mechanical focus.
3.6 ILA
®
Bias Settings
The ILA
®
Bias settings are factory set and should not normally need adjustment
unless specific maintenance has been performed that requires an ILA
®
Bias
readjustment. Avoid readjusting the ILA
®
Bias settings unless absolutely
necessary.
The ILA
®
Bias settings adjust the electrical bias levels to each ILA
®
assembly to a
"just off" threshold point so that even the smallest incoming light from the CRT
makes the ILA
®
assembly react. When properly set, this adjustment will put each
ILA
®
assembly at the threshold of operation. If not properly set, image black level
will be adversely affected and the ILA
®
assembly won't react properly to incoming
light. ILA
®
Bias adjustments should be done in a darkened room.
NOTE:
If the room cannot be darkened enough to set the ILA
®
Biases using the
screen, try holding a piece of paper a few inches from the lens of the color you are
adjusting. Adjust the bias in the usual manner while viewing the entire ILA
®
assembly area on the paper.
Note On Super Contrast Ila
®
Assemblies
If using optional Super Contrast ILA
®
assemblies, the High Contrast Compensator
may have to be adjusted for each color prior to performing the ILA
®
bias
adjustment. This procedure is required whenever an ILA
®
assembly is replaced or
if the compensator adjustment lever is inadvertently moved.
To set the High Contrast Compensator:
1. Press the HIDE key to mute CRT images.
2. Block the light from the green and blue lenses with the lens caps.
3. Move the front cover forward to provide access to the ILA
®
assemblies.
4. Disconnect the connector from the top of the red ILA
®
assembly.
5. Move the Compensator lever (this lever is just in front of the ILA
®
connector) to the right and left until the darkest level appears on the
screen. If a screen is not available use a piece of white paper in front of the
lens.
6. Reconnect the connector to the red ILA
®
.
7. Repeat the above steps for the green ILA
®
and the blue ILA
®
. Block the
light from the other two lenses each time.
8. Replace the cover.
9. Remove all lens caps
The CRTs will automatically cut off when you enter the ILA
®
Bias mode. Any
light on the screen is being reflected by the ILA
®
assembly.
To set the ILA
®
Frequency and Bias levels: