Sharp PG-A20X (serv.man10) Service Manual ▷ View online
21
PG-A20X
THE OPTICAL UNIT OUTLINE
Layout for proper setup of the optical components and parts (top view)
LIGHT SOURCE
(LAMP)
Mirror R,G,B
Condensing lens
B reflector
UV reflector
Mirror B
G reflector
Fly-eye lens(Input)
Fly-eye lens(Output)
Relay lens 1
Mirror R 1
Relay lens 2
R dichroic filter
Mirror R 2
Relay lens 3
Input polariser R
LCD(R)
LCD(B)
LCD(G)
Output pre-polariser G
Input polariser B
Input polariser G
Condensing lens B
Projection lens
Blue
Green/Red
Red
PBS
Green
Output pre-polariser B
Output pre-polariser R
Cross dichroic pr
ism
Condensing lens G
22
PG-A20X
Replacing the prism holder unit
1. Remove the two lock screws, and take the prism holder unit and the projection lens assembly out of the optical
unit.
2. Remove the four lock screws, separate the prism holder unit and the projection lens assembly from each other.
3. Replace the prism holder unit with new one. Take the above steps 1 and 2 in reverse order.
3. Replace the prism holder unit with new one. Take the above steps 1 and 2 in reverse order.
Note: Even if just one of the LCD panels is defective, it is necessary to replace the entire prism holder unit. Do not
replace just the defective LCD panel only.
1
Prism holder unit lock screws
2
Projection lens lock screws
Projection lens assembly
Prism holder unit
R-LCD panel
B-LCD panel
G-LCD panel
Optical unit
Display
