JVC Model 200 service manual Electronics System, General Description

Chapter 2---System Description

2.3 Electronics System

2.3.1 General Description

The Model 200 Electronics System includes nine printed circuit assemblies. They provide all the controlling voltages and signals to adjust and correct picture settings, geometry, convergence, and shading (see Chapter 4 of the User’s Guide). The Electronics System also controls video and sync input signals, LED displays on PCBs at the rear and side of the projector, two RS-232 communications ports, and two IR receivers for remote control of the projector.

The descriptions in this portion of the manual are based on an overall Electronics System block diagram and simplified block diagrams for each of the nine printed circuit assemblies. The diagrams and descriptions serve two purposes; first, to provide the technician with an overall grasp of how the system works and how each assembly works with other assemblies in the system, second, to provide the technician with enough information to troubleshoot to the assembly level, if needed.

Figure 2-2 provides an overall System Block Diagram to show how the Optical System, Arc Lamp, and Electronics System combine to provide the bright screen image.

AC

INPUT

IGNITER

	LAMP
POWER SUPPLY
LINE
FILTER
LOW VOLTAGE
POWER SUPPLY
VIDEO INPUT
CARDS
VIDEO	NE
PROCESSOR	P LA
RASTER TIMING	A C K
GENERATOR	B
SYSTEM
CONTROLLER

LAMP COLD MIRROR

		CONDENSING	INTEGRATOR
		LENS	UV FILTERS
		HIGH
HIGH VOLAGE		VOLTAGE	CROSS
		FOCUS	DICHROICS
POWER SUPPLY
G2
		TO CRTS
CONVERGENCE
DEFLECTION
SCAN REVERSAL	TO YOKES
HORIZONTAL			PROJECTION
VERTICAL		CRTS	LENS
DEFLECTION
VIDEO AMPLIFIERS		RELAY	OPTICS MODULE
		LENSES	ILA’S

ELECTRONICS MODULES

Figure 2-2.Model 200 System Block Diagram

Model 200 Service Manual 2-7