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
2-10 Model 330, 340SC, and 370SC Service Manual
When the Arc Lamp supply first turns on, it supplies 170V to the ignitor. The
ignitor then senses this voltage, activates it’s on-board supply, and produces a
1
µ
S, 38KV pulse to the Arc Lamp. This pulse strikes an arc in the lamp. The Arc
Lamp supply then provides the high current necessary to sustain the arc in the
lamp. Refer to Figure 2-5 and the summary below for a description on the Arc
Lamp and Ignitor timing.
LAMP-ON COMMAND
IGNITOR FIRES
38 KV
170V
22-30V
*
0V
/LAMPLIT
/ALENBL
/FANENBL
LAMP-OFF
COMMAND
FAN DISABLE
CPU TIME-OUT
5-10 MINUTES
ARC LAMP ON
1
2
3
4
5
6
*
22-30V depending on projector model.
Figure 2-5
Arc Lamp Ignitor Timing Diagram
Arc Lamp/Ignitor Timing Diagram Summary:
1.
The operator powers Arc Lamp on. /ALENBL and /FANENBL from
System Controller Board are pulled low. SPS receives /ALENBL from
SCB and turns on the Arc Lamp PS.
2.
Ignitor receives +170V boost voltage from the Arc Lamp PS.
3.
Ignitor steps up the +170V boost voltage to a 1
µ
sec pulse, approximately
38KV.
4.
Arc Lamp ignites from the 38kV pulse.
5.
High current (about 68-100A depending on projector model) begins
through Arc Lamp and voltage drops to +22-30V (depending on projector
model).
6.
/LAMPLIT signal goes to SCB to inform board that Arc Lamp is lit.