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 2—Functional Descriptions
2–6 Model 330, 340SC, and 370SC Service Manual
All of the SPS output voltages except Arc Lamp power are indicated by a LED
display (see ). The LEDs are located on a bar-type display on the backplane at the
left side of the card cage. The individual LEDs will be lit when the corresponding
voltage is energized. The LEDs are wired to the SPS output power using only a
current limiting resistor so when the LED is lit, it is an indication that there is a
voltage present, not necessarily the correct voltage. To verify whether or not the
voltage at the output is correct, a voltmeter must be used to probe the output
connectors J500, J501, or J502.
+5V +5V
STB
+24V
STB
+6.3V +15V -15V +24V +48V +107V -200V
Figure 2-2
Backplane Status Indicators.
A safety interlock switch is located on top of the power supply. The interlock
switch shuts off the System Power Supply whenever the cover is removed. During
normal operation with the cover installed, the switch is in the 'armed' position.
When the rear cover is removed, the switch will be released and cause power to
the projector to be interrupted. To run the unit without the cover installed,
override the interlock switch by pulling it up into the 'service' position. When the
cover is replaced, the switch will automatically be reset into the 'armed' position.
A circuit breaker is located on the right side of the System Power Supply. The
circuit breaker serves to remove all power from the projector (except for the
power at the input terminals) by switching it to the OFF position.
CAUTION!
The circuit breaker must be switched off, and the
projector must be disconnected from AC power prior to performance of any
maintenance, to ensure that all power is removed from the internal components of
the projector.
Normal operation of the System Power Supply is as follows:
When external power is applied, +5V Standby will always be energized as will the
internal SPS fans. +24V Standby power for operating the fans will be energized
whenever the lamp or electronics are turned-on and five (5) minutes after the
projector is shut down.
All other voltages are controlled by the power-up or power-down commands
issued by the operator.