Panasonic PT-LW373 / PT-LW333 / PT-LB423 / PT-LB383 / PT-LB353 / PT-LB303 (serv.man3) Service Manual ▷ View online
DIS-13
SECTION 2 DISASSEMBLY PROCEDURES
<LW373/LW333/LB423/LB383/LB353/LB303>
2. Optical Parts Disassembly
* Before taking the procedure, remove cabinet top and main board following to the "Mechanical Disassembly".
* Disassembly tools: 2.0mm hex wrench and screwdriver.
* Disassembly tools: 2.0mm hex wrench and screwdriver.
GR
GL
L-type Optical block
R-type Optical block
G-Optical block
Optical block
* 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 the next page).
polarized glass, please read the next page).
Important notice on optical block replacement
The Optical block 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
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 (M3x8) 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.
wrong white balance picture on the screen.
How to check optical block
Please check the print serial number on the G-Optical block 's cable.
Check optical block
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
2. 1. Optical block removal
GR --> R-Optical block
GL --> L-Optical block
DIS-14
SECTION 2 DISASSEMBLY PROCEDURES
<LW373/LW333/LB423/LB383/LB353/LB303>
Note on handling of inorganic polarizer
Indication of light in-coming side and
outgoing side
outgoing side
Cleaning capability of polarizer
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.
light emitted from the lamp.
<PT-LW373/LW333/LB423/LB383/LB353>
PT-LB303
The aluminum evaporated surface of inorganic polar-
izer is contact prohibition area. Prohibit touching it with
bare hand, wiping or contacting with the other parts.
izer 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.
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.
z
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.
glass with new gloves or with tweezers when handling it.
z
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
DIS-15
SECTION 2 DISASSEMBLY PROCEDURES
<LW373/LW333/LB423/LB383/LB353/LB303>
2. 2. Polarizer-in removal
Polarizer-in
Polarizer-in assy
A
A
A
*Do not disassembly the polarized
glass from the bottom.
glass from the bottom.
1 Mount the polarized glass at the center of the slot B precisely.
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
Mount the polarized glass
at the center of the slot B.
DIS-16
SECTION 2 DISASSEMBLY PROCEDURES
<LW373/LW333/LB423/LB383/LB353/LB303>
PBS shield
Iris unit
PBS
Integrator out
* Rugged surface
facing to the PBS
Integrator lens
stopper
stopper
Integrator lens holder-top
Integrator lens
shield
shield
Integrator lens
holder bottom
holder bottom
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.
2. 3. Condenser lens (OUT) removal
2. 4. PBS and integrator removal
A
B
B
A
A
A
A
PBS holder
Integrator in
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