Hughes JVC 100, Service Manual

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Chapter 2---System Description
Model 100 Service Manual 2-9
2.3 Electronics System
General Description
The Model 100 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 on the 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.
BA
CKP
L
A
N
E
90-264 AC
50 / 60 Hz
RGBVH
RS-232C / 422
IR RECEIVE
RG
B
/
H
V
FO
C
U
S
B YOKE
G YOKE
R YOKE
Figure 2-4 Model 100 Electronics System Block Diagram.