Panasonic PT-LW330 / PT-LW280 / PT-LB360 / PT-LB330 / PT-LB300 / PT-LB280 (serv.man5) Service Manual ▷ View online
-29-
GR
GL
L-
type Optical block
R-type Optical block
G-Optical block
Lighting block Disassembly
Before taking the procedure, remove cabinet top and main board following to the "Mechanical Disassembly".
Disassembly tools: 2.0mm hex wrench and screwdriver.
Optical block
Fig. 1
Fig. 1-1
Fig. 1-2
1. Optical block removal
* Note on handling the optical block
Optical block and polarized glasses are
very sensitive parts.
Use air blower to clear the dust on the
surface of the Optical block
(for more details about handling the inorganic
polarized glass, please read page 30).
polarized glass, please read page 30).
Important notice on Optical block replacement
The LCD panels used for this model cannot be
replaced separately. Do not disassemble the
Optical block. These Optical block are installed with
precision at the factory. When replacing the Optical
block, should be replaced whole of the Optical block
at once.
After replacing Optical block, take the optical and
electrical adjustments following to the chapter
"Adjustment".
1. Remove 2 screw A (M2.5x8.5) and pull out the lens/Optical block.
2. Remove 4 screw B (M2.5x8), remove the Optical block.
There are 2 types of optical block, named R-type and L-type.
When replacing the optical block, check the printed marker on the flat cable of the G-LCD panel and
use the same type of the optical block. If not used the same type, you will find the color shading or
wrong white balance picture on the screen.
How to check Optical block model
Please check the print serial number on the G-Optical block 's cable.
GR --> R-Optical block
GL --> L-Optical block
Check Optical block model
Top view of LCD panel/prism assy
G-LCD panel
B-LCD panel
Polarized glass OUT(B)
Polarized glass OUT(G)
Polarized glass OUT(R)
R-LCD panel
B B
B B
A
A
-30-
Lighting block Disassembly
2. Note on handling of inorganic polarizer
Indication of light in-coming side and
outgoing side
Cleaning capability of polarizers
Indication of light in-coming side and out-
going side
The incident and exit plane of the polarized glass or
Optical block is shown in the figure below. It shows the
light emitted from the lamp.
PT-LB360/PT-LW330/PT-LW280
PT-LB330/PT-LB300
PT-LB280
The aluminum evaporated surface of inorganic
polarizer is contact prohibition area. Prohibit touching
it with bare hand, wiping or contacting with the other
parts.
Screen side
Lamp side
Incident plane
Polarizer
Exit plane
This projector provides high durable inorganic polarizer which has a rib shaped evaporated aluminum on the glass
surface.
This surface is very delicate. If touching or wiping the surface, the polarizing function will be lost due to damage of
the aluminium rib construction on the surface. Extreme care should be taken to handle the polarizer.
●
Inorganic polarizer handling
Never grasp the surface or edges of the polarizer with bare hand. If fat and oil on your hand adheres on
the edges of polarizer, the linear bolt may appear on the glass surface due to capillarity. Grasp the edges
of the glass with new gloves or with tweezers when handling it.
●
Inorganic polarizer cleaning
When removing the dust on the surface, use a commercial (inert gas) air spray or air blower to remove
them. Never use organic solvents.
2.0mm
2.0mm
2.0mm
2.0mm
Contact prohibition area
Aluminum evaporated surface
Type
wipe cleaning
Incident plane Exit plane
Polarizer-out
R
Organic
OK
OK
G
Inorganic
NG
OK
B
Inorganic
NG
OK
Polarizer-in
R
Organic
OK
OK
G
Organic
OK
OK
B
Inorganic
OK
NG
Type
wipe cleaning
Incident plane Exit plane
Polarizer-out
R
Organic
OK
OK
G
Inorganic
NG
OK
B
Organic
OK
OK
Polarizer-in
R
Organic
OK
OK
G
Organic
OK
OK
B
Inorganic
OK
NG
Type
wipe cleaning
Incident plane Exit plane
Polarizer-out
R
-
-
-
G
Inorganic
NG
OK
B
Organic
OK
OK
Polarizer-in
R
Organic
OK
OK
G
Organic
OK
OK
B
Inorganic
OK
NG
-31-
Lighting block Disassembly
3. Polarizer-in removal
Polarizer-in
Polarizer-in assy
A
A
A
Fig. 3
*Do not disassembly the
polarized glass from the bottom.
1 Insert a screwdriver into slot B and rotate the screw A to the middle
position of slot B.
2 Tighten screw A and fix the polarized glass R board.
- Follow step 1-2 to mount the polarized glass G and B.
1. Remove 3 screws A (M2.5x6).
2. Remove lighting case top to unhook 5 hooks on it as
shown in the figure.
3. Pull each polarizer upward off.
Note on polarized glass mounting
A
Slot B
-32-
PBS shield
Iris unit
PBS
Marker
Integrator in
* Rugged surface
facing to the PBS.
Integrator out
* Rugged surface
facing to the PBS
Cutting
edge comes
to this side.
Integrator lens stopper
Integrator lens holder-top
Integrator lens shield
Integrator lens
holder bottom
Lighting block Disassembly
1. Remove 2 screws A(M3x8) to remove condenser lens-out assy.
1. Remove 3 screws A(T3x8) to take off the iris unit from the lighting case.
2. Remove 2 screws B(T3x8) to take off the PBS shield from the lighting case.
Fig. 5
4. Condenser lens (OUT) disassembly
Fig. 4
5. PBS and integrator disassembly
A
B
B
A
A
A
A
PBS holder
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