Model Model 340 SC Model 370 SC
DECLARATION OF CONFORMITY
Hughes-JVC Technology Corporation
SERVICE MANUAL
Confidential and proprietary information
Manufacturer Hughes-JVC Technology Corporation
Warnings and Cautions
Safety Information
Safety Equipment
Introduction
Projector Weight
Installation Safeguards
Ultra Violet and Infrared Light
Heat Safeguards
Light Safeguards
Fans
Ultraviolet radiation, dangerous glare, and high internal gas pressure
Power
Fluid Safeguards
Power Supply
Ventilation and Foreign Object Retrieval
Model 330, 340SC, and 370SC Service Manual
Safety
Model 330, 340SC, and 370SC Service Manual
Safety
1.1 Acronyms Used In Manual
1.0 Introduction
Model 330, 340SC and 370SC Service Manual
1.2 Safety
1.3 Updates
1.4 Hardware Compatibility
Video Amplifier Board
2.0 Functional Descriptions
Contents
2.1 Cover and Base
2.3 Electronics Systems Overview
2.2 External Power Requirements
The Model 330, 340SC and 370SC Electronics System consists of
System Power Supply
2.4 System Power
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
Pins 1,4,5,10 not used
High Voltage Power Supply
Power and Control Connector
Model 330, 340SC, and 370SC Service Manual
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
370SC
2.6 Circuit Boards
Description
340SC
Chapter 2-Functional Descriptions
Model 330, 340SC, and 370SC Service Manual
2-16
2-17
Figure 2-10 Raster Generation Block Diagram
Model 330, 340SC and 370SC Service Manual
Chapter 2-Functional Description
Raster Timing Generator Board RTG p/n
Sync Detector and Selector
Sync Generator
Serration and Equalization Lockout
Phase Locked Loop
VSYNC Detector, Field Separator, and Mux
Adjustment Counters
Information
Serial Communication
Description
IICCLK
Raster Timing Generator I/O
Horizontal Deflection Board
Inputs
Interlocks and Protection
Horizontal Deflection Board P/N 102523 HDB
System Power Supply
Vertical Oscillator
Horizontal Power Supply
Horizontal Phase Locked Loop
Horizontal Centering
Geometric Correction
Flyback Switching
Output Section
Description
Horizontal Sweep Failure Detection
Serial Communication
Information
Horizontal Deflection Board I/O
Raster Timing Generator
Inputs
Vertical Deflection Board P/N 102521VDB
System Power Supply
Interlocks and Protection
Vertical raster centering Top and bottom pincushion correction
Vertical Preamps
Sweep Failure Detection
Vertical Amplifiers
Side Pincushion and Keystone Correction
Top and Bottom Pincushion and Keystone Correction
Horizontal Linearity Correction
Serial Communication
Correction Amplifiers
RXCORR RYCORR GXCORR GYCORR BXCORR
System Controller Board
General I/O
Information
Description
System Controller Board
Outputs
Internal
Interlocks and Shutdowns
Input
Output
Chapter 2-Functional Descriptions
Model 330, 340SC and 370SC Service Manual
2-42
Video Processor Board P/N 104672 VPB
Decoder
B, G, and R Brightness and Contrast Amplifiers
Video/Sync Mux
V & H Sync Strip
SG Sync Strip
Switch Logic and Video Enable
On-Screen Switch
Gamma Correction
RGB Sensitivity and Threshold Amplifier
Information
ILA Bias
Dynamic Focus Amplifier
Serial Communication
Description
General I/O
System Controller Board
Input
Raster Timing Generator
System Controller Board
Outputs
Description
Vertical Deflection Board
Decoder
Image Light Amplifiers
Outputs
Description
Outputs
High Voltage Power Supply
System Power Supply
Interlocks and Protection
Output
Video Amplifier Board P/N 103567 or 103774 VAB
Internal
Failure Detection
Video Signal
Arc Protection
DC Restore
Enable Circuit
Beam Current Sense
General I/O
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
Video Processor Board
Description
System Controller Board P/N 104668 SCB
System Power Supply
Inputs
General Functional Description
Page
Expanded Memory
Working and Compressed Memory
DACs
Correction Address Generator
Overlay Address Generator
Overlay Memory
IR Interface
Overlay Interface
LED Display Buffers and Logic
RS232 Interface
General I/O
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
Description
Video Processor Board
Description
Input
Description
Raster Timing Generator
Description
Input
Description
Vertical Deflection Board
Description
Input
Horizontal Deflection Board
Backplane Board p/n
Backplane
Relay Lens
CRT Assembly
Image Light Amplifier ILA Assembly
2.7 Optical Section
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
Screen
CRT Image
Combined Image and High
Intensity Light=Bright Image
Prism
Arc Lamp Assembly
Projection Lens
Optical Subassemblies
2.8 Image Light Amplifier
Figure 2-20 The Hughes-JVC Image Light Amplifier
Figure 2-21 Simplified illustration of the Series 300 Projector optical path
Chapter 3---Service Adjustments
3.0 Service Adjustments
3.1 Service Cover-Off Power-On Sequence
Contents
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
Note On Super Contrast Ila Assemblies
3.6 ILA Bias Settings
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
Front/Rear Jumpers
3.9 Jumper Settings
F R O N T p ro jectio n
R E A R p ro jectio n
J601
Inverted Vertical Jumpers
J300 J301 J500 J501
J200 J201 J600 J400
G2 Setting
3.10 G2 Adjustment
Sensitivity/Threshold Offset
To set G2 1. Cut off R and B and view G
Model 330 Arc Lamp Alignment and Focus
3.11 Arc Lamp Alignment and Focus
To refocus the Model 330 Arc Lamp
Y-Axis Plate
Model 340SC and 370SC Arc Lamp Alignment and Focus
X-Axis Plate Z-Axis Screwplate
Figure 3-9. Model 340SC and 370SC Arc Lamp Adjustments
3.12 Arc Lamp Current Adjustment
2. Measure the number of millivolts between pins 3 and 4 on SPS J505
Model 330, 340SC, 370SC Service Manual
Chapter 3---Service Adjustments
3-23
Model 330, 340SC, and 370SC Service Manual
4.0 Maintenance Remove/Replace
4.1 Introduction
Contents
before performing any removal and replacement procedures
WARNING!!! Disconnect AC power from the projector
Model 330, 340SC, and 370SC Service Manual
Chapter 4-Maintenance
Figure 4-1 Major components of the Model 330 Projector
Model 330. 340SC, 370SC Service Manual
Chapter 4-Maintenance
Figure 4-2 Major components of the Model 340SC and 370SC Projectors
4.3 Ventilation Filters
4.2 Projector Covers
Model 330 Ignitor and Arc Lamp Assembly P/N 900611S Removal
4.4 Arc Lamp Assembly
J503 and J504 Ignitor Assembly
Location on
Wire Color
Wire goes to
Ignitor
J503 J504 J505 Interlock Switch Lamp Current Adjust
Interlock Switch Fan Connector Circuit Breaker
Start Capacitor Squirrel Cage Fan Cable
3-mm Set Screw Mounting Screws
Collimating Condensing Lens Adjustment
4.5 System Power Supply
screws under lip
AC Power Terminal Block Ground Main AC Circuit Breaker Mounting
4.6 Electronics Module
11. Replace the module in the reverse order
Model 330 CRT Removal
4.7 Cathode Ray Tube CRT
5. Remove the video amplifier board from the CRT Assembly Section
Model 330, 340SC, and 370SC Service Manual
Figure 4-10 Model 340SC and 370SC CRT Assembly
Figure 4-11 CRT Z-Axis Focus Adjustment Rods circled
Chapter 4-Maintenance
Model 340SC and 370SC CRT Removal
4.8 Video Amplifier Board VAB
To remove a VAB see Figure 4-9 or Figure
To remove the CRT yoke see Figure 4-9 or Figure
4.9 CRT Yoke
4.10 High Voltage Power Supply HVPS
4.11 Card Cage Printed Circuit Boards
4.12 Image Light Amplifier Assembly
Lens Locking Rods
4.13 Projection Lens
4-24
Chapter 4-Maintenance
Model 330. 340SC, 370SC Service Manual
Table 4-2 for reference to part numbers, if necessary
Lens Part Number or Designation
4.14 SCB Socket Battery Replacement
CAUTION! Never place the socket battery on a metal
Lens Throw
CAUTION! Never place the socket battery on
340SC
4.15 Recommended Spares
Description
Quantity
5.1 General Information
5.0 Troubleshooting
Contents
Page
5.2 Power-On Codes
Code
Second Set
Description
Description
5.3 Break Points
Code
Meaning
Description
Resetting the Projector
Break Trap Data from the Diagnostics Menu
Code
Model 330, 340SC, and 370SC Service Manual
5.4 Main Menu Structure
Version 5.1.0 Software Menu Diagram
Chapter 5---Troubleshooting
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
Problem and
Possible Solution
Service
Intermittent
Glossary of Terms
Cold Mirror
Test pattern of black-to-white gradation bars. The more levels
Intensity
Lumen
Retrace
Phase adjustment
Resolution
Raster
Scan
See Arc Lamp
temporarily with the Executive I/R remote
Glossary
Model 330, 340SC, and 370SC Service Manual