Special Handling For The Dmd And Optical Engine - InFocus LP340B Service Manual

Special Handling for the DMD and Optical Engine

The LP340/340B/350 models differ from some other DLP projectors built by InFocus. To save space and
weight, the Texas Instruments circuitry is located on the controller ECA instead of on a separate board.
This means the controller ECA must directly contact the DMD elastomers to transmit the image signals to
the DMD.
To allow proper contact, the DMD is not fastened to the optical engine. This allows accurate alignment
when the controller ECA rests on the DMD. Four screws fasten the controller ECA to the engine around
the DMD. This sandwiches the DMD and the elastomers between the two, ensuring even pressure and
good contact.
The DMD is a very delicate, very expensive component. It is susceptible to shock, ESD and dust.
Make sure you work on the projector only on a soft, ESD-protected workspace.
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