Panasonic PT-LW375 / PT-LW335 / PT-LB425 / PT-LB385 / PT-LB355 / PT-LB305 (serv.man3) Service Manual ▷ View online
SECTION
1
INF-1
(2018-12)
SECTION 1 SERVICE INFORMATION
CONTENTS
1. Circuits Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INF-2
1. 1. Thermal switch
1. 2. Lamp cover switch
1. 3. Fuse (F2003)
1. 2. Lamp cover switch
1. 3. Fuse (F2003)
2. Maintenance/Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INF-3
2. 1. Maintenance
2. 2. Replacing the Unit
2. 3. How to check the lamp runtime
2. 4. Cleaning
2. 2. Replacing the Unit
2. 3. How to check the lamp runtime
2. 4. Cleaning
3. Notes on service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INF-10
3. 1. Before service operation
3. 2. Service
3. 3. Security functions
3. 4. Standby mode
3. 5. How to change the baud rate of serial communication port
3. 2. Service
3. 3. Security functions
3. 4. Standby mode
3. 5. How to change the baud rate of serial communication port
4. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INF-14
4. 1. LED indicators
4. 2. Shutdown system
4. 3. Error log
4. 4. Troubleshooting chart
4. 5. I/O port functions
4. 2. Shutdown system
4. 3. Error log
4. 4. Troubleshooting chart
4. 5. I/O port functions
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.
● 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
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
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