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Chapter 2---System Description
2.3 Electronics System
2.3.1 General Description
IGNITOR
POWER SUPPLY
LINE
AC
FILTER
INPUT
LOW VOLTAGE
POWER SUPPLY
SYSTEM
CONTROLLER BOARD
RASTER TIMING
GENERATOR
CONVERGENCE
DEFLECTION BOARD
HORIZONTAL
VERTICAL
DEFLECTION BOARD
ELECTRONICS MODULE
Figure 2-2. Model 220 System Block Diagram
Model 220 Service Manual
The Model 220 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.
ARC LAMP
HIGH VOLAGE
POWER SUPPLY
VIDEO
PROCESSOR
BOARD
SCAN REVERSAL
BOARD
VIDEO INPUT
CARDS
VIDEO AMP
ARC LAMP
HIGH
VOLTAGE
FOCUS
G2
TO CRTS
CRTS
OPTICS MODULE
RELAY
LENSES
ILA'S
FIRST
CONDENSING
LENS
COLD MIRROR/
IR FILTER
UV FILTER/
SECOND
CONDENSING LENS
DIFFUSER
DICHROIC
MIRROR
ASSEMBLY
PROJECTION
LENS
2-7
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