PT-LW375, PT-LW335, PT-LB425, PT-LB385, PT-LB355, PT-LB305 (serv.man3) — Panasonic Projector Service Manual (repair manual). Page 12

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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
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