PT-LW375, PT-LW335, PT-LB425, PT-LB385, PT-LB355, PT-LB305 (serv.man3) — Panasonic Projector Service Manual (repair manual). Page 13

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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.
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