Panasonic PT-LW375 / PT-LW335 / PT-LB425 / PT-LB385 / PT-LB355 / PT-LB305 (serv.man3) Service Manual ▷ View online
INF-6
SECTION 1 SERVICE INFORMATION
<LW375/LW335/LB425/LB385/LB355/LB305>
The displayed time
in [Lamp counter]
On-screen display
<WARNING> indicator
Over 19 700 hours
less than 20 000
hours
f
The lamp replacement icon
is displayed for 10 seconds. If
you press any button within 10 seconds, the icon disappears.
f
The lamp replacement icon
will display for 4 seconds on
the screen after switching the input source or turning on the
projector.
--
Over 20 000 hours
less than 22 000
hours
f
The lamp replacement warning icon
is
displayed for 10 seconds. If you press any button within 10
seconds, the icon disappears.
f
The lamp replacement warning icon
will
display for 4 seconds on the screen after switching the input
source or turning on the projector.
Lighting in red. (The indicator will not
light in the standby mode)
Over 22 000 hours
f
The lamp replacement warning icon
is
displayed for 10 seconds. If you press any button within 10
seconds, the icon disappears.
f
The lamp replacement warning icon
will
display for 4 seconds on the screen after switching the input
source or turning on the projector.
f
The lamp automatically turns off at approximately 10
minutes after turning on the power.
Blinking in red. (The indicator will not
light in the standby mode)
Note
f
The lamp replacement icon or lamp replacement warning icon will not be displayed when during "Freeze" or "AV mute".
f
The usage period of 20 000 hours which is displayed in [Lamp counter] is a rough estimate and is not guaranteed.
Replacing the Lamp unit
Attention
Attention
f
When the projector is mounted on a ceiling, do not work with your face close to the projector.
f
Do not remove or loosen the screws other than specified ones when replacing the lamp unit.
f
Make sure to attach the lamp unit and the lamp cover securely.
1) Turn off the power by the procedure in “Powering Off the Projector” operating instructions.
Remove the AC power plug from the wall outlet.
f
Wait at least one hour and make sure the lamp unit and surroundings are cool.
2) Use a Phillips screwdriver to loosen the lamp cover fixing screw (×1) until it turns freely and remove the lamp
cover.
f
Remove the lamp cover by pulling it slowly toward the direction of the arrow as the above figure shown.
3) Use a Phillips screwdriver to loosen the three lamp unit fixing screws (×3) until they turn freely.
4) Hold the used lamp unit by its handles, and pull it gently from the projector.
5) Insert the new lamp unit in correct direction. Tighten the three lamp unit fixing screws (×3) securely with a
4) Hold the used lamp unit by its handles, and pull it gently from the projector.
5) Insert the new lamp unit in correct direction. Tighten the three lamp unit fixing screws (×3) securely with a
Phillips screwdriver.
f
When you experience difficulty in installing the lamp unit, remove it and try again. If you use force to install the lamp
unit, the connector may be damaged.
6) Attach the lamp cover. Tighten the lamp cover fixing screw (×1) securely with a Phillips screwdriver.
f
Perform step
2) in reverse direction to attach the lamp cover.
Lamp cover
Lamp cover
fixing screw
Handles
Lamp unit fixing
screws
INF-7
SECTION 1 SERVICE INFORMATION
<LW375/LW335/LB425/LB385/LB355/LB305>
Resetting the lamp counter
Be sure to reset the lamp counter after replacing the lamp unit.
1) Connect the power plug, press the power < v/b> button.
2) While pressing the a button on the control panel, press and hold the <INPUT/ENTER> button on the control
1) Connect the power plug, press the power < v/b> button.
2) While pressing the a button on the control panel, press and hold the <INPUT/ENTER> button on the control
panel for eight seconds or more.
f
The lamp counter is reset and the usage time of the luminous lamp becomes 0 hour. (At this time, there is displaying
nothing.)
3) Press the <INFO.> button on the remote control.
f
The [Info.] screen is displayed.
f
Make sure that the display of the [Lamp counter] is [0 H].
f
Please try step
2) again if the lamp counter has not been reset.
Note
f
After replacing the lamp unit, reset the lamp counter. Otherwise, the actual lamp usage time cannot be confirmed.
Air filter unit
When the dust remains after cleaning, the filter replacement timing has come.
The Replacement Filter Unit (Model No.: ET-RFL300) is an optional accessory. To purchase the product, consult your dealer.
Replacing the air filter unit
Attention
f
Make sure to turn off the power before replacing the air filter unit.
f
Make sure that the projector is stable, and perform the replacement in a safe place where the unit will not be damaged even
if you drop the air filter unit.
1) Remove the air filter cover.
f
Refer to “Removing the air filter unit” of item in the Operating Instructions.
2) Remove the air filter unit.
f
Refer to “Removing the air filter unit” of item in the Operating Instructions.
3) Attach the optional Replacement Filter Unit (Model No.: ET-RFL300) to the air filter cover.
f
Refer to “Attaching the air filter unit” of item in the Operating Instructions.
4) Attach the air filter cover to the projector.
f
Refer to “Attaching the air filter unit” of item in the Operating Instructions.
5) Reset the filter counter.
f
Refer to “Resetting the filter counter”of item in the Operating Instructions.
Attention
f
When using the projector, be sure to attach the air filter unit. If it is not attached, the projector will suck in dirt and dust
causing a malfunction.
f
The air filter unit to be replaced should be an unused product.
Note
f
The time until the air filter is clogged varies greatly depending on the usage environment.
f
When the projector is used without resetting the filter counter, the actual filter usage time will not be able to be confirmed.
INF-8
SECTION 1 SERVICE INFORMATION
<LW375/LW335/LB425/LB385/LB355/LB305>
2. 3. How to check the lamp runtime
The WARNING indicator will light in red when the lamp runtime (corresponding value) reaches 20 000 hours.
This is to indicate that lamp replacement is required. The lamp runtime is calculated by using the below formula.
The displayed time in [Lamp counter] = "Lamp runtime of [ (Normal)]" × 2 +"Lamp runtime of [ (Eco)]"
+ "Lamp runtime of [ (Quiet)]" × 2
When [Lamp control] is constantly set to [ (Normal)] without switching to other modes = 10 000 hours
When [Lamp control] is constantly set to [ (Eco)] without switching to other modes = 20 000 hours
When [Lamp control] is constantly set to [ (Quiet)] without switching to other modes = 10 000 hours
Follow the procedure below to check the lamp runtime:
1. Press and hold the
< v/b> button on the projector or the remote control for more than 20 seconds.
2. The projector runtime and lamp runtime will be displayed on the screen briefly as follows.
Total used time
Projector used time
Cumulative lamp
runtime in each
mode
*In this picture, "Eco1" and "Eco2" refer to "Eco" and "Quiet" respectively.
Counter
Projector
110 H
Lamp
Normal 60 H
Eco1 30 H
Eco2
20 H
Corresponding value 190 H
INF-9
SECTION 1 SERVICE INFORMATION
<LW375/LW335/LB425/LB385/LB355/LB305>
2. 4. Cleaning
Cleaning with air spray
1. Remove the cabinet top according to SECTION 2 "Mechanical Disassembly".
2. Clean up the Optical block and polarizing plate by using the air spray from the cabinet top opening.
Caution:
Use a commercial (inert gas) air spray designed for cleaning camera and computer equipment. Use a resin-based nozzle only.
Be very careful not to damage optical parts with the nozzle tip. Never use too much cleanser on the unit. Never use abrasive
cleaner, solvent or other rough chemical that may scratch the cabinet surface.
Disassembly cleaning
Disassembly cleaning method should only be performed when the unit is considerable dirty and cannot be sufficiently cleaned
by air spraying alone.
Be sure to readjust the optical system after performing disassembly cleaning.
1. Remove the cabinet top and main unit following to "Mechanical Disassembly".
2. If the Optical block needs cleaning, remove the Optical block unit following to "Optical block replacement".
3. Clean the optical parts with a soft cloth. Clean extremely dirty areas using a cloth moistened with alcohol.
Caution:
The surface of the optical parts consist of multiple dielectric layers with varying degrees of refraction.
Never use organic solvents (thinner, etc.) or any kind of cleanser on these parts.
Since the optical block is equipped with an electronic circuit, never use any liquids (water, etc.) to clean the unit.
Use of liquid may cause the unit to malfunction.
2. 4.1. Cleaning the projection lens
Unplug the AC power cord before cleaning.
Gently wipe the projection lens with a cleaning cloth that contains a small
amount of non-abrasive camera lens cleaner, or use a lens cleaning paper or
commercially available air blower to clean the lens.
Avoid using an excessive amount of cleaner. Abrasive cleaners, solvents or
other harsh chemicals might scratch the surface of the cabinet.
2. 4. 2. Cleaning the projector cabinet
Unplug the AC power cord before cleaning.
Gently wipe the projection body with a soft dry cleaning cloth. When the
cabinet is heavily soiled, use a small amount of mild detergent and finish
with a soft dry cleaning cloth. Avoid using an excessive amount of cleaner.
Abrasive cleaners, solvents or other harsh chemicals might scratch the
surface of the cabinet.
When the projector is not in use, put the projector in an appropriate carrying
case to protect it from dust and scratches.
After long periods of use, dust and other particles will accumulate on the optical block, prism, mirror, polarized glass, lens,
etc., Causing the picture to darken or color to blur. If this occurs, clean the inside of the Lighting block. Remove dust and
other particles using air spray. If dirt cannot be removed by air spray, disassemble and clean the Lighting block.
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