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 Description
Model 330, 340SC and 370SC Service Manual 2-65
each line in the raster. The starting address is timed by the /MAPST signal. When
that comes along, it indicates the top of the raster is beginning so the address
generator should begin counting at the beginning.
Overlay Interface
The Overlay Interface takes the raw data out of the Overlay Memory and sends
formatted information to the VPB for generating the desired displays. Some of the
data is simply buffered and sent along. That data is the information regarding the
full brightness and external video that produces everything but greyscale and dots.
The greyscale, dot, and pyramid patterns must first be decoded by a D to A. After
conversion to analog and appropriate filtering, the information is sent out to the
VPB as the VIDTEST signal.
LED Display Buffers and Logic
The LED dot matrix display is located on the rear of the projector just under the
video and sync input connectors. In that location, it is not physically located on
the SCB but it is directly controlled by the CPU with connection via the
backplane.
The Dot Matrix Display is used for displaying operational and error codes. These
codes will assist in troubleshooting and verifying proper operation. The Dot
Matrix Display receives its data from the CPU via the display buffer.
RS232 Interface
The RS232 Interface is a bi-directional communications port. The interface
protocol is RS232 with two (2) ports; one (1) port being fully functional with the
other having more limited use.
The Terminal In port is the fully functional port. It is used for communicating
with the projector using a VT100 or similar terminal emulator. The terminal
allows accessing all functions available on the projector. In addition, using the
terminal provides the user with continuously updated status data. The bi-
directional port allows third-party controllers to be used to control the projector
using ASCII character control codes.
The Terminal Out port is also RS232 but has limited functionality. It is used
primarily for attaching a switcher to the projector to allow for smoother switching
of sources.
IR Interface
The IR Interface is a receive-only interface. There is no capability to transmit
information out of the projector over the IR interface. The user must depend on
the on-screen information and LED Dot Matrix displays to verify operation of the
projector.