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Model
PT-LW375 PT-LW335 PT-LB425 PT-LB385 PT-LB355 PT-LB305 (serv.man3)
Pages
70
Size
20.3 MB
Type
PDF
Document
Service Manual
Brand
Device
Projector / LCD PROJECTOR
File
pt-lw375-pt-lw335-pt-lb425-pt-lb385-pt-lb355-pt-lb.pdf
Date

Panasonic PT-LW375 / PT-LW335 / PT-LB425 / PT-LB385 / PT-LB355 / PT-LB305 (serv.man3) Service Manual ▷ View online

INF-2
SECTION 1 SERVICE INFORMATION
<LW375/LW335/LB425/LB385/LB355/LB305>
1. Circuits Protection
This projector provides the following circuit protections to operate in safety. If the abnormality occurs inside the projector, it will 
automatically turn off by operating one of the following protection circuits. 
1. 1. Thermal switch 
There is a thermal switch inside of the projector to detect the inter-
nal temperature rising abnormally. When the internal temperature 
around lamp reaches near 120°C , the thermal switch will open to 
cut off the power supply to the lamp power circuit.
The thermal switch is not reset to normal automatically even if the 
internal temperature becomes normal. Please reset the thermal 
switch following to the procedure below.
How to reset the thermal switch
1. Remove the cabinet top case.
2. Press the reset button on the thermal switch. 
Caution:
Before press the reset button, disconnect the AC cord from the 
projector.
1. 2. Lamp cover switch
The lamp cover switch cuts off the drive signal to the lamp circuit 
when the lamp cover is removed or not closed completely. After open-
ing the lamp cover for replacing the lamp unit, place the lamp cover 
correctly otherwise the projector cannot turn on. 
1. 3. Fuse (F2003)
A fuse is located inside of the projector. When the <ON (G)/STANDBY (R)> indicator is not lighting, the fuse may be opened. 
Please check the fuse as following steps.
The fuse should be used with the following type;
Fuse Part No.: K5E632YY0007
TYPE VBS UBM 6.3A 250V (PF) FUSE
CONQUER. TYPE VBS UBM
How to replace the fuse
1.  The fuse is placed on the filter board. Remove the cabinet
    top according to the SECTION 2 "Mechanical Disassembly". 
2.  Take the fuse off from the fuse holder, then replace the new
    one with the specified type. 
 
Fuse
(F2003)
Thermal fuse 
Lamp cover switch
INF-3
SECTION 1 SERVICE INFORMATION
<LW375/LW335/LB425/LB385/LB355/LB305>
2. Maintenance/Replacement
Before performing maintenance/replacement
 
f
When you perform maintenance or replacement of the parts, make sure to turn off the power and disconnect the power plug 
from the wall outlet.
 
f
Be sure to observe the procedure  "Powering Off the Projector" of Operating Instructions when performing power supply 
operation.
2. 1. Maintenance 
Outer Case
Wipe off dirt and dust using a soft dry cloth.
 
f
If the dirt is persistent, soak the cloth with water and wring it thoroughly before wiping. Dry off the projector with a dry cloth.
 
f
Do not use benzene, thinner, or rubbing alcohol, other solvents, household cleaners. Using them may cause deterioration of 
the outer case.
 
f
When using chemical treated dusters, follow its instruction.
Front glass surface of the lens
Wipe off the dirt and dust off the front surface of the lens with soft clean cloth.
 
f
Do not use a cloth that has an abrasive surface or a cloth that is moist, oily, or covered with dust.
 
f
Do not use excessive force when wiping the lens as it is fragile.
 
f
Do not use benzene, thinner or rubbing alcohol, other solvents or household cleaners. Using them may cause deterioration of 
the lens. 
Attention
 
f
The lens may be damaged if you hit with a hard object or wipe with excessive force. Please handle with care.
Air filter unit
Perform maintenance of the air filter in the following cases.
 
f
If the time which is set in [Expand] menu → [Filter counter] is elapsed, the filter warning icon 
 will be dis-
played. 
 
f
If the air filter is clogged with dust, the power indicator <ON(G)/STANDBY(R)> blinks in orange, or the filter warning icon 
 will be displayed and after a while the projector is turned off automatically. 
Attention
 
f
Make sure to turn off the power before performing maintenance on the air filter unit.
 
f
Make sure that the projector is stable, and perform the maintenance in a safe place where the unit will not be damaged even 
if you drop the air filter unit 
Removing the air filter unit
Air filter cover
Tabs
Fig.1
Fig.2
Hook
Hook
Air filter cover
Air filter unit
1)  Remove the air filter cover. (Fig.1)
 
f
Pull out the air filter cover from the hook of the projector while slightly pushing upward the tabs of the air filter cover and 
open it in the direction of the arrow in figure.
2)  Remove the air filter unit.
 
f
The air filter unit is fixed by the three hooks. Grasp the fibre of the air filter unit near to the cover side with one hook and 
then pull the air filter unit out from the air filter cover as arrow direction shown. (Fig.2)
 
f
After removing the air filter unit, remove foreign objects and dust from the air filter compartment and the projector’s air 
intake port if there are any.
INF-4
SECTION 1 SERVICE INFORMATION
<LW375/LW335/LB425/LB385/LB355/LB305>
Cleaning the air filter unit
Remove the air filter unit beforehand according to the previously described procedure in “Removing the air filter unit.
1) Clean the air filter unit.
  ● Vacuum dirt and dust from the air filter unit.
  ● Do not wash the air filter unit.
Attaching the air filter unit
1) Attach the unused air filter unit to the air filter cover.
  ● There is a distinction between the inside and outside of the air filter unit. Align the red mark on the air filter unit  
      with the red mark on the air filter cover.
  ● Insert the air filter unit to the side with the two hooks and then press the other side of the air filter unit into the 
     cover side with one hook.
2) Attach the air filter cover to the projector.
  ● Perform Step 1) in “Removing the air filter unit” of the operating instructions in the reverse order.
  ● Make sure that the air filter cover is closed tightly.
Resetting the filter counter
Be sure to reset the filter counter after cleaning the air filter unit.
1)  Connect the power plug, press the power < v/b> button.
2)  Press the <MENU> button to display the main menu, then press 
as to select [Expand].
3)  Press the <INPUT/ENTER> button on the control panel or the <ENTER> button on the remote control, then  
press as to select [Filter counter].
4)  Press the <INPUT/ENTER> button on the control panel or the <ENTER> button on the remote control, then  
press as to select [Filter counter reset].
5)  Press the <INPUT/ENTER> button on the control panel or the <ENTER> button on the remote control.
 
f
The [Filter counter reset ?] confirmation message is displayed. 
6)  Press as to select [Yes], then press the <INPUT/ENTER> button on the control panel or the <ENTER> button on 
the remote control.
 
f
The [OK?] screen is displayed.
7)  Press as to select [Yes], then press the <INPUT/ENTER> button on the control panel or the <ENTER> button on 
the remote control.
 
f
The filter counter is reset and the filter usage time becomes 0 hour. 
Attention
 
f
Do not disassemble the air filter unit.
 
f
When attaching the air filter unit, make sure that the projector is stable, and work in an environment that is safe, even in the 
event of the air filter unit dropping.
 
f
Make sure that the air filter unit is properly attached before using the projector. If it is not attached, the projector will suck in 
dirt and dust causing a malfunction.
Inside (Smooth fibre)
Outside (Cotton-like fibre)
Air filter cover
Air filter cover
Air filter unit
Red mark
Red mark
Hook
Hook
Air filter unit
INF-5
SECTION 1 SERVICE INFORMATION
<LW375/LW335/LB425/LB385/LB355/LB305>
Note
 
f
After cleaning the air filter, reset the filter counter. Otherwise, the actual filter usage time cannot be confirmed.
 
f
Replace the air filter unit with the new optional Replacement Filter Unit (Model No.: ET-RFL300) if it is damaged or if the dirt 
does not come off even after cleaning.
2. 2. Replacing the Unit
 Lamp unit
The lamp unit is a consumable component. Refer to “When to replace the lamp unit” for details about the replacement cycle.
When purchasing the optional Replacement Lamp Unit (Model No.: ET-LAL510), consult your dealer.
Warning
Do not replace the lamp unit when it is hot. (Wait at least one hour after use).
The inside of the cover can become very hot, take care to avoid burn injuries.
Notes on the replacement of the lamp unit
 
f
A Phillips screwdriver is necessary when replacing the lamp unit.
 
f
Since the luminous lamp is made of glass, it may burst if dropped or hit with a hard object. 
Handle with care.
 
f
Do not disassemble or modify the lamp unit.
 
f
When replacing the lamp unit, be sure to hold it by the handle because its surface is  
pointed and its shape is protruded.
 
f
The lamp may rapture. Replace the lamp unit carefully so the glass fragments of the  
lamp do not scatter. While attaching the projector to the ceiling, do not work right  
under the lamp unit or do not conduct work while your face is near the lamp unit.
 
f
The lamp contains mercury. When disposing of used lamp units, contact your  
 local authorities or dealer for correct methods of disposal. 
Attention
 
f
 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
 
f
The model numbers of accessories and optional accessories are subject to change without prior notice.  
When to replace the lamp unit
ENGLISH - 101
Attention
 
f
 
f
 
f
. If it is not attached, the projector will suck in 
dirt and dust causing a malfunction.
Note
 
f
 
f
-RFL300) if it is damaged or if the dirt 
does not come off even after cleaning.
Replacing the unit
Lamp unit
The lamp unit is a consumable component. Refer to “When to replace the lamp unit” for details about the replacement cycle.
When purchasing the optional Replacement Lamp Unit (Model No.: ET-LAL510), consult your dealer.
Warning
Do not replace the lamp unit when it is hot. (Wait at least one hour after use.)
The inside of the cover can become very hot, take care to avoid burn injuries.
Notes on the replacement of the lamp unit
 
f
A Phillips screwdriver is necessary when replacing the lamp unit.
 
f
Since the luminous lamp is made of glass, it may burst if dropped or hit with a hard object. 
Handle with care.
 
f
Do not disassemble or modify the lamp unit.
 
f
When replacing the lamp unit, be sure to hold it by the handle because its surface is  
pointed and its shape is protruded.
 
f
The lamp may rapture. Replace the lamp unit carefully so the glass fragments of the  
lamp do not scatter. While attaching the projector to the ceiling, do not work right  
under the lamp unit or do not conduct work while your face is near the lamp unit.
 
f
The lamp contains mercury. When disposing of used lamp units, contact your  
local authorities or dealer for correct methods of disposal.
Attention
 
f
Panasonic takes no responsibility for any damage or malfunction of the product resulting from use of lamp units which are 
Note
 
f
The model numbers of accessories and optional accessories are subject to change without prior notice.
When to replace the lamp unit
The lamp unit is a consumable component. Since its brightness gradually decreases over time, it is necessary to replace the 
lamp unit regularly.
Please refer to the displayed time in [Lamp counter] of [Info.] about the usage time of lamp.   
 
The estimated duration before replacement is 20 000 hours which is displayed in [Lamp counter], but the lamp may go 
off before the time above mentioned has elapsed depending on individual lamp characteristics, usage conditions, and the 
installation environment. It is recommended that the Replacement lamp unit be prepared earlier. 
The time which is displayed in [Lamp counter] is a total time when the real usage time in [   (Normal)], [   (Eco)] or [   
(Quiet)] is converted to the runtime in [   (Eco)]. Please note that they are not displayed individually.
The displayed time in [Lamp counter] = “Lamp runtime of [   (Normal)]” × 2 + “Lamp runtime of [   (Eco)]” 
+ “Lamp runtime of [   (Quiet)]” × 2
The real usage time when the displayed time in [Lamp counter] is 20 000 hours means, 
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
If you continue to use the lamp unit after the displayed time in [Lamp counter] 22 000 hours has elapsed, the lamp turns off 
automatically at approximately 10 minutes after turning on the power, as it will cause malfunction of the projector.
Chapter 6   Maintenance - Maintenance/replacement
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