Panasonic PT-M1083U Service Manual page 56

For rear mounting
If using the rear mounting method to set up the projector, you will need to change the deflection and replace
the
spacers. It may also be necessary to change the CRT angle.
NOTE:
.
The dimensions for the eff ective
screen area are those for an aspect
ratio of 4:3.
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~ ~ ~ ~ ~
"