PT-TW350, PT-TX410, PT-TX320 (serv.man3) - Panasonic Projector Service Manual (repair manual). Page 12

INF-2

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. 

There is a thermal switch inside of the projector to detect the 

internal 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.

1. Remove the cabinet top case.
2. Press the reset button on the thermal switch. 

Before press the reset button, disconnect the AC cord from the 
projector.

The lamp cover switch cuts off the drive signal to the lamp 
circuit when the lamp cover is removed or not closed com-
pletely. After opening the lamp cover for replacing the lamp 

unit, place the lamp cover correctly otherwise the projector 
cannot turn on. 

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;

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. 
 

Thermal fuse 

Lamp cover switch

Fuse
(F2003)