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Chapter 1---Introduction
1-2 Model 250 Service Manual
When performing procedures that call for the projector’s power to be on, always
wear high voltage gloves (ANSI/ASTM 10,000 volt rated) when working around
the CRTs, Arc Lamp or power supplies. Wear safety goggles (rated X5) when
working near the light path from the Arc Lamp or at all times around the
projection lens.
1.2 Updates
Hughes-JVC will periodically provide bulletins and /or manual supplements to
ensure the continued accuracy of this service manual.
1.3 Acronyms Used
ALPS Arc Lamp Power Supply
C Chrominance
CDB Convergence/Deflection Board
CH Channel
CPU Central Processing Unit
CRT Cathode Ray Tube
EMI Electromagnetic Interference
EPROM Erasable Programmable Read-Only Memory
FPGA Field Programmable Gate Array
F to V Frequency to Voltage
G1 CRT Grid 1
G2 CRT Grid 2
HVDB Horizontal/Vertical Deflection Board
Hz Hertz
HSYNC Horizontal Sync
HVDB Horizontal/Vertical Deflection Board
HVPS High Voltage Power Supply
IIC Inter-Integrated Circuit
ILA
®
Image Light Amplifier
I/O Input/Output
I/R Infrared
kHz Kilohertz
LED Light Emitting Diode
LVPS Low Voltage Power Supply
NTSC National Television Standards Committee
PAL Phase Alternating Line
PCB Printed Circuit Board
PLL Phase Lock Loop
PLUGE Picture Line-Up Generating Equipment
RAM Random Access Memory
RGB Red, Green and Blue
RGBHV Red, Green, Blue, Horizontal, Vertical
ROM Read Only Memory
RTG Raster Timing Generator
SCB System Controller Board