Epson EMP-S4, Service Manual

Page: 67 / 102

4-5
EMP-S4
SEIKO EPSON Revision:B
4.1.3 Projector-Specific Service Precautions
Points to Note When Working
Detailed points to note are given in each section, so be sure to read each section thoroughly
before beginning the disassembly procedure. Below are several general points which should be
noted.
•
When the projector is disassembled, the dust in and around parts such as the fans and air fil-
ter may get transferred to other parts such as the R, G and B light valves which are the cen-
tral part of the display mechanism. This may have an adverse effect on the quality of
projected images. Accordingly, check whether any of the parts are dusty or dirty, and use a
vacuum cleaner to
clean them first before carrying out disassembly work .
•
The Optical Engine and the circuit boards are very sensitive to static electricity. Place them
inside static-proof bags once they have been removed from the projector.
•
When carrying out any of the following operations, check that there is no dust or dirt on the
respective components or on any lens and glass surfaces before installation. If any such con-
tamination is found, clean it off using isopropyl alcohol.
•
Optical engine removal
•
Lamp inner unit removal
•
Air filter removal
•
The speaker unit contains a permanent magnet, so keep it away from any storage media
such as floppy disks and magnetic cards.
•
The Optical Engine is very sensitive to vibration and shocks, so handle it with care.
•
Do not disassemble any components (such as the power supply unit) which do not have
express disassembly procedures described in this Service Manual.
C H E C K
P O I N T
The Optical Engine and Main (MA) Board are paired together as a single service
part. Neither is available separately. For service that requires the replacement of
either 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.
„
Do not replace the component parts of the Optical Engine with parts from
other Optical Engines.