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 2-51
Vertical Deflection Board
Inputs
Description
VPARAB
A periodic, positive-going, parabolic waveform with the
vertical scan frequency, used for dynamic focus.
HPARAB
A periodic, positive-going, waveform with the horizontal scan
frequency, used for dynamic focus.
/SWEEPOK
A TTL DC level signal indicating that, when low, indicates all
flybacks are occurring at or above a minimum frequency.
Video Amplifier Board
Inputs
Description
RBEAM
Voltage signal proportional to cathode current averaged over
several horizontal lines, in the red CRT. Voltage level is
+1mV/uA.
GBEAM
Similar to RBEAM.
BBEAM
Similar to RBEAM.
/RVIDOK
Open collector signal indicating the health of the red +100V
cathode supply.
/GVIDOK
Similar to /RVIDOK.
/BVIDOK
Similar to /RVIDOK.
Video Amplifier Board
Outputs
Description
BLANKING
Pulse signal output that is a buffered replica of the VIDBLANK input
from the SCB. Indicates the commanded blanking interval during
the scan.
/BENABLE
Logical connection of video amp, sweep, and power health
indications. TTL level output.
/RENABLE
Identical to /BENABLE.
/GENABLE
Identical to /BENABLE.
RVOUT
Red video output. 0V to 1V (TP1).
GVOUT
Green video output. 0V to 1V (TP2).
BVOUT
Blue video output. 0V to 1V (TP3).
CLAMP
Pulse signal output that is a buffered replica of the SCRSTR input
from the SCB. Indicates the commanded timing and duration of
the DC restore.
External Video
Inputs
Description
RVIDCH1
Red video input to channel 1.
RVIDCH2
Red video input to channel 2.
GVIDCH1
Green video with optional composite sync signal input to channel 1.
GVIDCH2
Green video with optional composite sync signal input to channel 2.