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
![](/manual/jvc/330/projector-service-manual/images/img-138.png)
Chapter 4—Maintenance
Model 330, 340SC, and 370SC Service Manual
4-25
Table 4-2
Lens
Replacement
Lens Throw Lens Part Number or Designation
Ratio Red Green Blue
1.5:1 101241 101241 101715
3:1 900609-3 900609-2 900609-1
5:1 101239 101239 101239
7:1
101240 101240 101240
NOTE:
More details on lens options, converters and other lens information
can be found in the appropriate model Operator's Manual.
4.14 (SCB) Socket Battery Replacement
As indicated in the troubleshooting table (under “Picture-Various Problems”,
weak backup RAM socket batteries in the SCB can cause lost data when the
projector is turned off and back on again. All four (4) of these batteries should be
replaced at the same time if this condition occurs.
CAUTION!
Never place the socket battery on a metal
surface!
The positive and negative terminals could short out and destroy
the battery!
WARNING!!!
Danger of explosion if this battery is
incorrectly replaced! When replacing the Lithium batteries, be sure they
are ilnstalled with the correct polarity. If installed backwards they could
explode! Replace only with the same or equivalent type recommended by
the manufacturer. Dispose of the old Lithium batteries in accordance with
local safety codes. Contact your local authorities for proper disposal
procedure.
To replace the SCB socket batteries:
CAUTION!
When replacing SRAM all channel data
will be lost. All channel data must be downloaded.
1.
Download all channel data on the System Controller.
2.
Remove the System Controller Board PCB (refer to Section 4.11).