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
Model 330, 340SC and 370SC Service Manual 2–7
The Arc Lamp power supply is a current-controlled supply with an open circuit
voltage of about 170V. When the Arc Lamp is operating at steady state, the power
supply provides the current set by the technician. The output of the supply has a
large capacitor that will, on initial ignition of the Arc Lamp, provide the very high
initial current necessary to ionize the xenon gas in the lamp and sustain the arc.
The current setpoint is initially set at the factory and must be reset by the
technician whenever an Arc Lamp is replaced.
AC INPUT
220-240vac
50Hz
STANDBY/
I/O CONTROL
+5v, +24v
J502
J500
J503 (-)
J504 (+)
To
Backplane
To
Arc Lamp
Via
Ignitor
POWER
FACTOR
CORRECTION
LOW VOLTAGE
Power Supply
+5v,+6.3v,+-15v,
+24v,+48v,+107v
ARC LAMP
Power Supply
and Boost
+22v/68a
∇
+170v/1.0a
/LVPSNBL
/ALENBL
From
System
Controller
/FANENBL
J502
∇
Model 330. Model 340SC = +25V/80a; Model 370SC = +30V/100a.
Figure 2-3
System Power Supply Block Diagram.
Normal system power-up (Electronics and Lamp):
1.
Upon receipt of Power-On command, SCB pulls /FANENBL and
/ALENBL lines low.
2.
+24V Standby and Arc Lamp power supplies turn on.
3.
When Arc Lamp lights (run voltage sensed by a window comparator in the
SPS), SPS pulls /LAMPLIT line low.
4.
When SCB senses /LAMPLIT low, SCB pulls /LVPSNBL line low.
5.
Low voltage supplies turn on.
6.
SCB senses +5V supply at correct level and enters normal program
sequence.
Lamp only power-up:
1.
Upon receipt of Lamp-On command, SCB pulls /FANENBL and
/ALENBL lines low.