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 4—Maintenance
Model 330, 340SC, and 370SC Service Manual
4-19
3.
Ensure that all control cables are disconnected from the back of the
cardcage then tilt the card cage back to expose the inside of the CRT
housing.
4.
Unplug and label the five cables connected to the VAB.
5.
Unplug and remove the VAB from the back of the CRT.
CAUTION!
The connector pins on the CRTs are easily
damaged. If damaged, the CRT must be replaced and will not be
covered by warranty. Use extreme care when taking the VAB out of
the CRT housing to avoid damage to the CRT connector pins. In
some cases, it may be necessary to move the CRT all the way
forward (Z axis focus rod, rear of CRT assembly—see to Figure
4-11).
6.
Perform the above steps in the reverse order to replace the VAB.
7.
Perform a CRT Mechanical Focus adjustment (Section 3.7) after replacing
the VAB.
4.9 CRT Yoke
The CRT yoke is located on the CRT neck and is supported by the CRT.
There is one (1) yoke for each CRT.
To remove the CRT yoke (see Figure 4-9 or Figure 4-10):
1.
Unplug the projector. Wait at least one (1) minute before proceeding for
the high voltage to bleed off.
2.
Run the CRT all the way forward (Z axis focus rod, rear of CRT
assembly).
3.
Remove the video amplifier board (see Section 4.8).
4.
Loosen the yoke clamp and ensure the yoke is loose on the CRT neck.
5.
Disconnect the yoke cable connector. Slide the yoke assembly off the rear
of the CRT.
CAUTION!
The connector pins on the CRTs are easily
damaged. If damaged, the CRT must be replaced and will not be
covered by warranty. Use extreme care when taking the yoke out of
the CRT housing to avoid damage to the CRT connector pins. In
some cases it may be necessary to use the two other mechanical
focus adjustment rods to tilt the CRT to allow the yoke to be
removed from the CRT neck.
6.
Perform the above steps in the reverse order to replace the yoke assembly.