2-6
EMP-TW1000
SEIKO EPSON Revision:A
Optical system drive block
Figure 2-5. Optical Engine Functional Diagram
C H E C K
P O I N T
The Lamp Unit, Light Guide Unit, POP Unit, and Projection Lens together make
up the Optical Engine. These components are assembled and adjusted together at
the factory, and are not available as separate service parts.
C A U T I O N
Do not subject the optical system components to physical shocks or strong
vibration.
Do not disassemble the Light Guide Unit. Disassembly will cause color
distortion, even if reassembled very carefully.
The Optical Engine and MA Board are figured and adjusted together at the
factory. They are only available as a matched pair, and must always be
replaced together when either the Optical Engine or MA Board has a failure.
Table 2-1.
Component Name Function/Other
Lamp Unit An UHE-170W discharge lamp is the light source.
Light Guide Unit
The light guide unit disperses the light from the light source via lens
arrays A and B in order to provide uniform illumination. In addition, a
UV filter removes any harmful ultraviolet light from the LCD. After this
light is polarized, it is then split into 3 spectrums (R, G and B).
Light Bulbs
The intensity of the distributed components of the RGB light is controlled
by means of the light valve.
Prism Unit
The prism unit integrates the red, green and blue light and sends it
through the projection lens.
Projection Lens
The projection lens focuses the light composed by the prism and projects
an image on the screen.
Cinema Filter
When the color mode is set to the Natural, Theater, Theater black 1,
Theater black 2, the cinema filter changes the luminance level to low.
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