DECLARATION OF CONFORMITY
Hughes-JVC Technology Corporation
SERVICE MANUAL
Model Model 340 SC Model 370 SC
Manufacturer Hughes-JVC Technology Corporation
Confidential and proprietary information
Safety Information
Safety Equipment
Introduction
Warnings and Cautions
Installation Safeguards
Projector Weight
Heat Safeguards
Light Safeguards
Fans
Ultra Violet and Infrared Light
Ultraviolet radiation, dangerous glare, and high internal gas pressure
Fluid Safeguards
Power Supply
Ventilation and Foreign Object Retrieval
Power
Safety
Model 330, 340SC, and 370SC Service Manual
Safety
Model 330, 340SC, and 370SC Service Manual
1.0 Introduction
1.1 Acronyms Used In Manual
1.2 Safety
1.3 Updates
1.4 Hardware Compatibility
Model 330, 340SC and 370SC Service Manual
Video Amplifier Board
Contents
2.0 Functional Descriptions
2.1 Cover and Base
2.2 External Power Requirements
2.3 Electronics Systems Overview
The Model 330, 340SC and 370SC Electronics System consists of
2.4 System Power
System Power Supply
Figure 2-2 Backplane Status Indicators
∇ Model 330. Model 340SC = +25V/80a Model 370SC = +30V/100a
2. +24V Standby and Arc Lamp power supplies turn on
Arc Lamp Ignitor
22-30V depending on projector model
High Voltage Power Supply
High Voltage Power Supply
Power and Control Connector
Model 330, 340SC, and 370SC Service Manual
Pins 1,4,5,10 not used
CRT anode voltages are not user controllable. They are fixed at 32KV with a maximum output of 2.1mA total or 0.7mA per CRT. The anode voltage is the primary acceleration voltage for the CRT. Other bias voltages screen grid, G2, and control grid, G1 are used to control the level of beam current. The anode voltage is routed out of the top of the HVPS, into the CRT housing to three 3 bulkhead connectors. From there, the anode wires on the CRTs route the anode voltage directly to the CRT. The anode voltages are overvoltage and overcurrent protected in the event of short circuits or CRT arcing
2.5 Card Cage
2.6 Circuit Boards
Description
340SC
370SC
2-16
Model 330, 340SC, and 370SC Service Manual
Chapter 2-Functional Descriptions
Figure 2-10 Raster Generation Block Diagram
Model 330, 340SC and 370SC Service Manual
Chapter 2-Functional Description
2-17
Raster Timing Generator Board RTG p/n
Sync Generator
Sync Detector and Selector
VSYNC Detector, Field Separator, and Mux
Phase Locked Loop
Serration and Equalization Lockout
Adjustment Counters
Description
Serial Communication
Information
Raster Timing Generator I/O
IICCLK
Horizontal Deflection Board
Interlocks and Protection
Horizontal Deflection Board P/N 102523 HDB
System Power Supply
Inputs
Vertical Oscillator
Horizontal Centering
Horizontal Phase Locked Loop
Horizontal Power Supply
Output Section
Flyback Switching
Geometric Correction
Horizontal Sweep Failure Detection
Serial Communication
Information
Description
Horizontal Deflection Board I/O
Raster Timing Generator
Vertical Deflection Board P/N 102521VDB
System Power Supply
Interlocks and Protection
Inputs
Vertical raster centering Top and bottom pincushion correction
Vertical Preamps
Side Pincushion and Keystone Correction
Vertical Amplifiers
Sweep Failure Detection
Horizontal Linearity Correction
Top and Bottom Pincushion and Keystone Correction
RXCORR RYCORR GXCORR GYCORR BXCORR
Correction Amplifiers
Serial Communication
General I/O
Information
Description
System Controller Board
System Controller Board
Outputs
Interlocks and Shutdowns
Input
Output
Internal
2-42
Model 330, 340SC and 370SC Service Manual
Chapter 2-Functional Descriptions
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
Gamma Correction
On-Screen Switch
Switch Logic and Video Enable
RGB Sensitivity and Threshold Amplifier
ILA Bias
Dynamic Focus Amplifier
Serial Communication
Information
General I/O
System Controller Board
Input
Description
System Controller Board
Outputs
Description
Raster Timing Generator
Vertical Deflection Board
Image Light Amplifiers
Outputs
Description
Decoder
High Voltage Power Supply
System Power Supply
Interlocks and Protection
Outputs
Internal
Video Amplifier Board P/N 103567 or 103774 VAB
Output
Video Signal
Failure Detection
DC Restore
Enable Circuit
Beam Current Sense
Arc Protection
This section provides a comprehensive description of the inputs to and outputs from the VAB. The I/O description are arranged by the source/destination of the signal and so the assemblies communicated with are used as the primary heading of each group of signals and then are further subdivided into inputs and outputs. In each case, the signals direction is noted, with input referring to an input to the VAB, and output to an output from the VAB e.g. under Video Processor Board Input CLAMP refers to the signal CLAMP that is an input to the VAB from the Video Processor Board. When test points are provided for the I/O they are noted
General I/O
Video Processor Board
System Controller Board P/N 104668 SCB
System Power Supply
Inputs
Description
General Functional Description
Page
Working and Compressed Memory
Expanded Memory
Correction Address Generator
DACs
Overlay Memory
Overlay Address Generator
Overlay Interface
LED Display Buffers and Logic
RS232 Interface
IR Interface
IIC Interface
Serial Interface
There are three 3 ports for receiving IR radiation. One 1 is located on the front of the projector just above the Green projection lens and the other two 2 are located on the rear panel. One of the receivers on the rear panel is located next to the LED display and, like the front receiver, is used for directly receiving IR radiation. The other rear-mounted receiver is used for connecting an IR repeater, which is an optional device that allows the user to control the projector from up to 150 feet away
General I/O
Video Processor Board
Description
Input
Description
Raster Timing Generator
Description
Input
Description
Vertical Deflection Board
Description
Input
Description
Horizontal Deflection Board
Backplane
Backplane Board p/n
CRT Assembly
Image Light Amplifier ILA Assembly
2.7 Optical Section
Relay Lens
light. The vertically polarized light then passes through the prism to the projector lens. The ILA assembly combines the input signal from the CRT with the high intensity light from the arc lamp. Thus, the brightness of the screen image does not depend on the brightness of the CRT but on the light from the xenon arc lamp. A more detailed explanation of the ILA assembly is in Section 2.8 at the end of this chapter
CRT Image
Combined Image and High
Intensity Light=Bright Image
Screen
Projection Lens
Arc Lamp Assembly
Prism
2.8 Image Light Amplifier
Optical Subassemblies
Figure 2-20 The Hughes-JVC Image Light Amplifier
Figure 2-21 Simplified illustration of the Series 300 Projector optical path
3.0 Service Adjustments
3.1 Service Cover-Off Power-On Sequence
Contents
Chapter 3---Service Adjustments
Main AC Circuit Breaker
3.2 CRT Yoke Rotation
7. View R
3.3 Vertical Size Tracking
3.4 Vertical Linearity Tracking
3.5 Horizontal Size Tracking
3.6 ILA Bias Settings
Note On Super Contrast Ila Assemblies
3.7 CRT Mechanical Focus
The lower-left rod adjusts the CRT to ILA distance z- axis
2. Increase Size to 100% horizontal and vertical
3.8 Electronic Focus
3.9 Jumper Settings
Front/Rear Jumpers
R E A R p ro jectio n
F R O N T p ro jectio n
Inverted Vertical Jumpers
J300 J301 J500 J501
J200 J201 J600 J400
J601
Sensitivity/Threshold Offset
3.10 G2 Adjustment
G2 Setting
To set G2 1. Cut off R and B and view G
3.11 Arc Lamp Alignment and Focus
Model 330 Arc Lamp Alignment and Focus
To refocus the Model 330 Arc Lamp
X-Axis Plate Z-Axis Screwplate
Model 340SC and 370SC Arc Lamp Alignment and Focus
Y-Axis Plate
3.12 Arc Lamp Current Adjustment
Figure 3-9. Model 340SC and 370SC Arc Lamp Adjustments
2. Measure the number of millivolts between pins 3 and 4 on SPS J505
3-23
Chapter 3---Service Adjustments
Model 330, 340SC, 370SC Service Manual
4.0 Maintenance Remove/Replace
4.1 Introduction
Contents
Model 330, 340SC, and 370SC Service Manual
WARNING!!! Disconnect AC power from the projector
before performing any removal and replacement procedures
Figure 4-1 Major components of the Model 330 Projector
Chapter 4-Maintenance
Model 330, 340SC, and 370SC Service Manual
Figure 4-2 Major components of the Model 340SC and 370SC Projectors
Chapter 4-Maintenance
Model 330. 340SC, 370SC Service Manual
4.2 Projector Covers
4.3 Ventilation Filters
4.4 Arc Lamp Assembly
Model 330 Ignitor and Arc Lamp Assembly P/N 900611S Removal
J503 and J504 Ignitor Assembly
Wire Color
Wire goes to
Ignitor
Location on
Start Capacitor Squirrel Cage Fan Cable
Interlock Switch Fan Connector Circuit Breaker
J503 J504 J505 Interlock Switch Lamp Current Adjust
Collimating Condensing Lens Adjustment
3-mm Set Screw Mounting Screws
4.5 System Power Supply
AC Power Terminal Block Ground Main AC Circuit Breaker Mounting
screws under lip
4.6 Electronics Module
11. Replace the module in the reverse order
4.7 Cathode Ray Tube CRT
Model 330 CRT Removal
5. Remove the video amplifier board from the CRT Assembly Section
Figure 4-10 Model 340SC and 370SC CRT Assembly
Figure 4-11 CRT Z-Axis Focus Adjustment Rods circled
Chapter 4-Maintenance
Model 330, 340SC, and 370SC Service Manual
To remove a VAB see Figure 4-9 or Figure
4.8 Video Amplifier Board VAB
Model 340SC and 370SC CRT Removal
4.9 CRT Yoke
To remove the CRT yoke see Figure 4-9 or Figure
4.10 High Voltage Power Supply HVPS
4.11 Card Cage Printed Circuit Boards
4.12 Image Light Amplifier Assembly
4.13 Projection Lens
Lens Locking Rods
Chapter 4-Maintenance
Model 330. 340SC, 370SC Service Manual
Table 4-2 for reference to part numbers, if necessary
4-24
4.14 SCB Socket Battery Replacement
CAUTION! Never place the socket battery on a metal
Lens Throw
Lens Part Number or Designation
CAUTION! Never place the socket battery on
4.15 Recommended Spares
Description
Quantity
340SC
Contents
5.0 Troubleshooting
5.1 General Information
Page
5.2 Power-On Codes
Description
Second Set
Code
5.3 Break Points
Code
Meaning
Description
Resetting the Projector
Break Trap Data from the Diagnostics Menu
Code
Description
5.4 Main Menu Structure
Version 5.1.0 Software Menu Diagram
Chapter 5---Troubleshooting
Model 330, 340SC, and 370SC Service Manual
Problem and
Possible Solution
Service
Symptom to
Problem and
Possible Solution
Service
Symptom to
Problem and
Possible Solution
Service
Symptom to
Problem and
Possible Solution
Service
Symptom to
Problem and
Possible Solution
Service
Symptom to
Problem and
Possible Solution
Service
Symptom to
Intermittent
Glossary of Terms
Cold Mirror
Test pattern of black-to-white gradation bars. The more levels
Intensity
Lumen
Phase adjustment
Resolution
Raster
Retrace
Scan
temporarily with the Executive I/R remote
See Arc Lamp
Model 330, 340SC, and 370SC Service Manual
Glossary