DOWNLOAD Panasonic PT-TW343RE (serv.man5) Service Manual ↓ Size: 20.71 MB | Pages: 94 in PDF or view online for FREE

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● When the projector is mounted on a ceiling, do not work with your face close to the projector.

● Do not remove or Remove the screws other than specified ones when replacing the lamp unit.

● Make sure to attach the lamp unit and the lamp cover securely.

    ● Wait at least 1 hour and make sure the lamp unit and surroundings are cool.

    the lamp cover.

    ● Remove the lamp cover by pulling it slowly toward the direction of the arrow as the above figure shown.

    ● 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.

    ●  Perform step 2) in reverse direction to attach the lamp cover.

Over 5 700 hours 

less than 6 000 

hours 

 



The lamp replacement icon 

 is displayed for 10 

seconds. If you press any button within 10 seconds, the 

icon disappears.

 



The lamp replacement icon 

 will display for 4 seconds 

on the screen after switching the input source or turning on 

the projector.

--

Over 6 000 hours 

less than 6 600 

hours 

 



The lamp replacement warning icon 

 is 

displayed for 10 seconds. If you press any button within 10 

seconds, the icon disappears.

 



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 6 600 hours 

 



The lamp replacement warning icon 

 is 

displayed for 10 seconds. If you press any button within 10 

seconds, the icon disappears.

 



The lamp replacement warning icon 

 will 

display for 4 seconds on the screen after switching the input 

source or turning on the projector. 

 



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)

● The lamp replacement icon or lamp replacement warning icon will not be displayed when during "Freeze" or "AV 

    mute".

● The usage period of 6 000 hours which is displayed in [Lamp counter] is a rough estimate and is not guaranteed.

Lamp cover

Lamp cover

fixing screw

Lamp unit 

fixing screws

Handles

AC IN 

The WARNING indicator will light in red when the lamp runtime (corresponding value) reaches 6,000 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)]" × 1.2 +"Lamp runtime of [    (Eco 1)]"

                                                                  + "Lamp runtime of [    (Eco 2)]" × 0.6

 

Normal

 : used time in the normal mode

 

Eco 1

   : used time in the Eco 1 mode

 

Eco 2   

: used time in the Eco 2 mode 

Follow the procedure below to check the lamp runtime:

1

  Press and hold the 

 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 

     110H

Lamp 

   

  

Normal                                       60H

Eco1                                           30H

Eco2 

     20H    

Corresponding value           114H

Total used time

Projector used time

Cumulative lamp 

runtime in each 

mode

● To make sure that the display of the [Lamp counter] is reset to [0 H].

● Please try step 2) again if the lamp counter has not been reset.

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Be sure to reset the lamp counter after replacing the lamp unit.

1) Connect the power plug, press the power <

> button on the control panel or on the remote control.

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.
    ● The lamp counter will be reset to 0. (At this time, there is displaying nothing.)

3) Press the <INFO.> button on the remote control .

    ● The [Info.] screen is displayed.

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. 

Remove the cabinet top following to "Mechanical Disassembly". Clean up the Optical block and polarizing plate by 

using the air spray from the cabinet top opening. 

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 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.

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. 

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. 

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. 

The basic service policy is shown below.

Repair contents

Applied parts

Block replacement 
P.C.Board replacement

 

- Lighting block (* Specified components are replaced)

 

- Optical Block

 

- P.C.Board

               (Specified components are replaced except A board and P board)
 

- Iris unit

Replaced by discrete components

Other electrical parts and mechanism parts

1.  Since very strong light is leakage from the surroundings of optical block, when checking or adjusting the 

projector with top cabinet removal, ware the UV protection glasses to protect the UV light. 

2. Before repairing, make sure to turn off the main power and disconnect the power plug from the power outlet.

  *  When replacing the print board, the internal electrical parts can be broken by the static electricity of clothes or 

human body. Please take care in static electricity, use an antistatic wrist strap or wear the anti-static electricity 

gloves.

3. After repairing, please check the gradation (10step or the gray scale) test pattern or moving image.

  Also, please check that it is normal on a self check screen.

The lamp cover switch detects whether the lamp cover is mounted securely.

When the lamp cover is mounted securely, the interlock switch (KW10) on the [A]-P.C.Board turns on.

Lamp cover switch