Epson RS-353, Service Manual

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GRID CELL
the light bulb B
1. Insert papers (black paper is desirable) that will shield light perfectly in between the
light bulb G and light bulb R (ray’s outlet).
Do not use a conductor or mirror to shield light (to preclude possible shorts in the
circuitry or misadjustment due to diffused reflected ray).
2. Perform steps (1) to (6) shown below to adjust the position of the light bulb B so
that the grid of the screen pattern (the pattern generated by the liquid crystal picture
elements) is clear.
(1) Loosen light bulb B fixing screws “A”, and
(2) Insert a flat-top screwdriver into the adjustment slot on the lower adjusting plate
and move it back and forth to attain complete focus on the top of screen, then
temporarily lock screws “A”
(3) Insert a flat-top screwdriver into the adjustment slot and move it back and forth
to attain complete focus on the bottom of screen, then temporarily lock screw
At this point, make sure that the top portion of the projection screen is also in focus.
(4) Loosen lower adjusting plate fixing and “G”.
(5) Insert a flat-top screwdriver into the adjustment slot and manipulate it to a
position where the left and right portions of the projection screen are in focus.
Temporarily lock screws and “G”.
(6) After confirming that focusing is established over the entire screen (projection
screen top, bottom, left, and right portions), tighten screws “A/B/C/F/G” with a
hardware torque driver ( 2.5 kg.cm = 2.16
Figure 5-I 1
5-6