4-8
EMP-822/EMP-83/EMP-X5/EMP-S5
SEIKO EPSON Revision:A
4.1.6 Precautions for Optical Engine and Main (MA) Board
The Optical Engine and MA Board are paired together as a single service part. Neither is
available separately. For servicing that requires the replacement either of the MA Board or the
Optical Engine, both components must be replaced together.
The component parts of the Optical Engine require mechanical installation positions to be
adjusted in relation to each other. In addition, the control circuit also has its own unique
characteristics, such as display signal output drivers, that differ from projector to projector.
There are also unique differences in each optical system mechanism, such as in the light
valves.
In order to obtain the optimum display, it is necessary to eliminate these differences in
electrical and mechanical characteristics as well as to make mechanical adjustments. The
various correction values are set at the time of shipment from the factory and are stored in
ROM on the MA Board.
Always replace the Optical Engine and MA Board together as a matched pair.
Do not disassemble the Optical Engine. Special jigs are required for
reinstalling the optical components in the engine, such as POP Assy.,
condenser lens, mirrors. Reassembling the Optical Engine without using the
jigs are strictly prohibited.
Do not remove the upper guide cover of the Optical Engine. Doing so may
contaminate the internal components with dust or dirt attached to the Optical
Engine and adversely affect the image quality.
Figure 4-1.
Only removing these
screws is permitted.
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