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
4-20
Model 330. 340SC, 370SC Service Manual
7.
Perform a CRT mechanical focus adjustment (Section 3.7) and yoke
alignment (Section 3.2) after yoke replacement.
4.10 High Voltage Power Supply (HVPS)
The HVPS is located on the left side of the projector next to the CRT housing
assembly.
To remove the HVPS:
1.
Unplug the projector. Wait at least a minute before proceeding for the high
voltage to bleed off.
2.
Run all three (3) CRTs all the way forward using the Z axis focus rods at
the rear of the CRT assembly (Photo 4-6).
3.
Remove all three (3) video amplifier boards (refer to Section 4.8 and either
Figure 4-4 or Figure 4-5).
4.
Remove the System Power Supply (see Section 4.5).
5.
Remove the System Power Supply mounting plate (covers High Voltage
Power Supply).
6.
Inside the CRT housing on the left side, disconnect all three (3) CRT
anode cables from the bulkhead connectors. As an added precaution, short
the anode leads to the High Voltage Chassis ground to bleed off any
residual charges. Slide the anode wire connectors off their mounting
brackets.
7.
In the bottom rear of the CRT housing, cut the tie wraps holding the HV,
G2, and focus cables.
8.
Carefully slide all G2, and focus cables out of the CRT housing.
9.
Remove the top connector (power control) at the rear of the HVPS.
10.
Loosen and release the five (5) captive screws at the base of the HVPS:
Two (2) screws are located forward.
One (1) screw on top.
Two (2) screws at the rear.
11.
Remove the HVPS.
12.
Replace the HVPS in the reverse order.
13.
Perform a CRT mechanical focus adjustment, yoke alignment, G2
adjustment, and electronic focus adjustment after HVPS replacement
(Sections 3.7, 3.2, 3.10, and 3.8).
NOTE:
When replacing the HVPS, ensure that the wires are routed to the
proper color and that the wires are neatly placed in the bottom of the CRT
housing.