Sharp XG-MB70X (serv.man9) Service Manual ▷ View online
24
XG-MB70X
THE OPTICAL UNIT OUTLINE
Layout for proper setup of the optical components and parts (top view)
(Schematic diagram)
Item
Function
Lamp
Light source. DC high-pressure mercury lamp.
Color wheel
Splits light from the light source into R, G, B and W through a color filter.
Rod
Assures uniform light ray.
Illumination lenses
Focus light from the rod on DMD.
Reflection mirror
Reflects light from the illumination lenses toward DMD.
Field lens
Focuses light from the reflection mirror on DMD and then the light from DMD to
the projection lens.
DMD
Turns the internal micromirror ON/OFF at the rate of color component of each dot
of the input source to reflect light.
Projection lens
Enlarges light from DMD and projects it on a screen.
DMD
Field lens
Lamp
Reflection mirror
Color wheel
Illumination lenses 1
Projection lens
Rod
UV Filter
Illumination lenses 2
25
XG-MB70X
After replacing the DMD, if shading is present on the screen as shown in Figure 1, adjust the lighting area of the
DMD by turning the adjustment screws for the optical engine.
1. Loosen the fixing screw for the adjustment lever 1. Adjust the lighting area by adjustment lever 2 and
then tighten the fixing screw for the adjustment lever 1.
2. If the lightening area cannot be adjusted after the above procedure, loosen the fixing screw 3, adjust the
area with adjustment screws 4 and 5, and then tighten the fixing screw 3.
Fig. 1
Shading
Display
