Panasonic PT-TW371R (serv.man3) Service Manual ▷ View online
INF-7
SECTION 1 SERVICE INFORMATION
<TW371R>
6) Attach the lamp cover. Tighten the lamp cover fixing screw (×1) securely with a Phillips screwdriver.
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Perform step
2) in reverse direction to attach the lamp cover.
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 button on the control panel, press and hold the <INPUT/ENTER> button on the control
panel for eight seconds or more.
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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.
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The [
Info.] screen is displayed.
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Make sure that the display of the [Lamp counter] is [0 H].
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Please try step
2) again if the lamp counter has not been reset.
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
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Make sure to turn off the power before replacing the air filter unit.
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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.
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Refer to “Removing the air filter unit” of item in the Operating Instructions.
2) Remove the air filter unit.
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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.
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Refer to “Attaching the air filter unit” of item in the Operating Instructions.
4) Attach the air filter cover to the projector.
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Refer to “Attaching the air filter unit” of item in the Operating Instructions.
5) Reset the filter counter.
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Refer to “Resetting the filter counter” of item in the Operating Instructions.
Attention
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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 caus-
ing a malfunction.
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The air filter unit to be replaced should be an unused product.
Note
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The time until the air filter is clogged varies greatly depending on the usage environment.
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When the projector is used without resetting the filter counter, the actual filter usage time cannot be confirmed.
INF-8
SECTION 1 SERVICE INFORMATION
<TW371R>
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.
Counter
Projector
110 H
Lamp
Normal 60 H
Eco1 30 H
Eco2
20 H
Corresponding value 190 H
Total used time
Projector used time
Cumulative lamp
runtime in each
mode
*In this picture, "Eco1" and "Eco2" refer to "Eco" and "Quiet" respectively.
INF-9
SECTION 1 SERVICE INFORMATION
<TW371R>
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 con-
tains 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 clean-
ers, solvents or other harsh chemicals might scratch the
surface of the lens.
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 appro-
priate 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.
INF-10
SECTION 1 SERVICE INFORMATION
<TW371R>
3. Notes on service
3. 1. Before service operation
3. 1. 1. LCD panel
1. The display unit of this projector comprises three LCD panels. Although an LCD panel is a product of high-precision tech-
nology, some of the pixels on the image may be missing or constantly lit. Please note that this is not a failure.
2. Displaying a still image for a longer time may result in an after-image on the LCD panels. If this happens, display the all
white screen in the test pattern for an hour or more.
3. 1. 2. Lamp
1. The light source of the projector is a high-pressure mercury lamp.
2. A high-pressure mercury lamp has the following characteristics.
• The luminance of the lamp will decrease by duration of usage.
• The lamp may burst with a loud sound or have its service life shortened because of shock, chipping, or degradation due to
cumulative runtime.
• The lamp life varies greatly depending on individual differences and usage conditions. In particular, continuous use for 12
hours or more and frequent off/on switching of the power greatly deteriorate the lamp and affects the lamp life.
• In rare cases, the lamps burst shortly after projection starts.
• The risk of bursting increases when the lamp is used beyond its replacement cycle. Make sure to replace the lamp unit
regularly. (Refer to items “When to replace the lamp unit”, “How to replace the lamp unit”)
• If the lamp bursts, gas contained inside of the lamp is released in the form of smoke.
• It is recommended that you store the Replacement Lamp Unit as a contingency.
Replacement lamp unit : ET-LAL510
[Attention] * Panasonic takes no responsibility for any damage or malfunction of the
product resulting from use of lamp units which are not manufactured by
Panasonic. Use only specified lamp units.
[Note]
* Please be sure to read the warnings and notices on the lamp that is de-
scribed in the Operating Instructions. "Read this first!", "Precautions for
use", "Maintenance/replacement".
3. 1. 3. Air filter unit
1. Make sure that the air filter unit is properly attached before using the projector. If it is not
properly attached, the projector will suck in dirt and dust causing a malfunction.
2. Air filter replacement is recommended after cleaning the unit two times. The dust-proof
properties may be reduced after each cleaning.
3. The cleaning and replacement cycle of the air filter unit varies depending on the usage
environment.
Replacement air filter unit : ET-RFL300
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