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 2-53
High Voltage Power Supply
Outputs
Description
VDFOCUS
Parabolic waveform of vertical frequency.
HDFOCUS
Parabolic waveform of horizontal frequency modulated by the
VDFOCUS waveform.
/HVEN
Enable signal for HVPS, used to shut down HVPS for CRT
protection.
System Power Supply
Inputs
Description
+5V
Power supply to digital components.
GND
Return from digital components.
+15V
Power supply to analog components.
-15V
Power supply to analog components.
GND (TP 0)
Return from analog components.
Interlocks and Protection
Input
/SWEEPOK
TTL high indicates that one or more of the sweeps, either horizontal or
vertical is not at or above the minimum amplitude and frequency. This will
cause a cutoff so that RVOUT, GVOUT, and BVOUT will be pulled low.
Additionally, /RENABLE, /GENABLE, and /BENABLE will be pulled high
resulting in shutdown of grid bias at the Video Output Boards. Also, the
SWEEPOK status bit will be transmitted to the SCB.
RBEAM
Signal representing average red CRT beam current at 1mV/1uA. At greater
than 0.7V, causes contrast and overlay intensity on all three colors to be
reduced.
GBEAM
Similar to RBEAM.
BBEAM
Similar to RBEAM.
/RVIDOK
High indicates low voltage at the +100V supply on the red Video Output
Board. This causes a low at the VIDOK status bit sent to the SCB over the IIC.
The /HVEN signal is allowed to go high shutting down the HVPS.
Additionally, a high cutoff signal is sent so RVOUT, GVOUT, and BVOUT
will be pulled low. /RENABLE, /GENABLE, and /BENABLE are also pulled