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 3---Service Adjustments
Model 330, 340SC, 370SC Service Manual 3-21
Figure 3-9. Model 340SC and 370SC Arc Lamp Adjustments
3. Verify that the condensing (collimating) lens assembly has not moved (see
Figure 4-1 or 4-2 and Photo 4-4). Check to see if the assembly is loose. It
should be unmovable in any direction.
4. The barrel of the lens assembly should be no more than 1½ inches (usually
much closer) from the blue dichroic mirror. If it needs to be moved closer,
first loosen the 3mm set screw located at the top of the mounting ring
(Photo 4-4) that the barrel sets in, then move the lens closer to the blue
dichroic mirror. This will increase the center brightness. Roll-off may not
be acceptable if the barrel is moved too far forward.
NOTE:
Be careful to maintain proper roll-off in these illumination optics
(arc lamp and condensing lens) adjustments. It is possible to get very high
brightness values at the screen center at the expense of proper roll-off. Try
to keep the ratio between center brightness and edge brightness. Roll-off is
2:1 to the edge and 4:1 to the corners (e.g.: if the center brightness is 20
foot-candles, the edge brightness should be at least 10 foot-candles and
preferably 10 foot-candles).
CAUTION!
Do not leave the roll-off at a value higher
than 4:1, or the center may be too bright and could result in
damage to the cold mirror.
5. Retighten the set screw.
3.12 Arc Lamp Current Adjustment
The Arc Lamp current must be reset whenever an Arc Lamp is replaced and
should be rechecked every 500 hours of Arc Lamp operation.
CAUTION!
If the Arc Lamp current is being adjusted due to
the installation of a new Arc Lamp or Arc Lamp/Ignitor assembly, the
current adjust pot (Photo 4-3) must be turned to minimum (fully CCW).
Failure to do this may result in damage to the equipment including failure
of the Arc Lamp, Ignitor, or power supply.
To check and adjust the Arc Lamp current:
1. Measure the output voltage at the System Power Supply (SPS) Ignitor
terminals J503 and J504. Note this figure.