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Chapter 2—Functional Descriptions
2–2 Model 330, 340SC, and 370SC Service Manual
System
Power
Supply
Line Voltage
System
Controller
Lamp Ignitor
Video
Processor
Low Voltage
Power Supply
Arc Lamp
Vertical
Deflection
and
Convergence
Horizontal
Deflection
Video Output
Amplifier
Raster
Timing
Generator
Image Light
Amplifiers
(3 each
Fans
High Voltage
Power Supply
RS 232
Infrared Remote
Channel 1
Channel 2
(R,G,B, H/V Sync)
CRTs
(3 each)
Figure 2-1
Model 330, 340SC and 370SC System Block Diagrams
2.1 Cover and Base
CAUTION!
The covers for the HJT Model 330, 340SC
and 370SC projectors must be installed for proper operation.
Operation of the projector, other than for maintenance, with the
covers removed is not recommended and will void the projector
warranty.
In addition to aesthetics, the covers on the Model 330, 340SC and 370SC
projectors serve several functions. The covers are an integral part of the cooling
system of the projector. Air intake filters are contained in the covers as are cooling
fans. The covers provide the operator and audience with protection from the
extremely bright light produced in the projector. The covers also serve to reduce
the noise generated by operation of the projector. The UL approval is only valid
with the covers installed since they provide the primary protection to prevent
personnel from coming into contact with the high voltages and currents contained
within the projector.