JVC 250 Service Manual

Contents

Chapter 2---System Description2-2 Model 250 Service ManualFigure 2-1 Overview of the Model 250 projector showing major components2.2 Electrical SectionThe electrical section consists of the Incoming Power Circuit, and the PowerSupplies and the Igniter Assembly. The following paragraphs give a list of majorcomponents and a brief description of those components. For a more detaileddescription of a component, refer to the chapter and section dedicated to thatparticular component.Incoming Power Circuit! Power Cord - The AC power comes in through the Power Cord to the ACCircuit Breaker.! AC Circuit Breaker - The Circuit Breaker connects and disconnects theprojector from electrical energy and protects the projector from over-voltage conditions.! AC Line Filter - The AC SF Series Line Filter reduces radiation generatedby a regulated power supply from returning to the AC power source.Power Supplies! Low Voltage Power Supply (LVPS) - The LVPS supplies standbyvoltages and the main system voltages to the projector.! Arc Lamp Power Supply (ALPS) - The ALPS supplies power to theIgniter Assembly while the Arc Lamp is lighting. After the Arc Lamp haslit, ALPS provides the steady state power to the Arc Lamp. The ALPSalso monitors the condition of the Arc Lamp and sends a feedback signalto the System Controller PCB if there is a problem.! High Voltage Power Supply (HVPS) - The HVPS provides the Anode,Focus (G3 ), Black Level (G 2 ), Blanking (G1 ), and Dynamic Focus voltagesfor the CRT.