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Circuit Protections
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Lamp cover switch
The lamp cover switch (SW8801) cuts off the drive signal to the
lamp circuit when the lamp cover is removed or no close com-
pletely. After opening the lamp cover for replacing the lamp ass’y,
place the lamp cover correctly otherwise the projector can not
turn on.
●
Thermal switch
There is the thermal switch (SW902) inside of the projector to
prevent the internal temperature rising abnormally. When the
internal temperature reaches near 100˚C, turn off the AC main
power supply automatically.
The thermal switch is not reset to normal automatically even if the
internal temperature becomes normal. Reset the thermal switch
following procedure.
Check the resistance between terminals of thermal switch by
using the tester. If it has high impedance, thermal switch may be
in operative.
How to reset the thermal switch
1.
Remove the cabinet top following to “Mechanical
Disassemblies”.
2.
Press the reset button on the thermal switch with a sharp-
pointed tool.
CAUTION:
Before press the reset button, make sure that the AC cord must
be disconnected from the AC outlet.
This projector provides the following circuit protections to operate in safety. If the abnormality occurs inside the pro-
jector, it will automatically turn off by operating one of the following protection circuits.
●
Fuse
A fuse is located inside of the projector. When the POWER indica-
tor is not lightning, the fuse may be opened. Check the fuse as fol-
lowing steps.
The fuse should be used with the following type;
How to replace the fuse
1.
Remove the cabinet top following to “Mechanical
Disassemblies”.
2.
Remove the cover on the Filter Board.
3.
Remove fuse from fuse holder.
To install the fuse, take reversed step in the above.
Fuse Part No.: 423 022 2102
TYPE T4.0AH 250V FUSE
LITTEL FUSE INC. TYPE 215004
Fuse
Filter Board
Lamp Cover
Lamp Cover Switch
Thermal Switch
* Following information differs from the model LV-S3 ;
- the cabinet
Summary of Contents for LV-S4
Page 1: ...Multimedia Projector SERVICE MANUAL Original Version FILE NO Model No LV S4 ...
Page 49: ... 49 BA9743AFV DC DC Converter IC371 IC Block Diagrams BA7078AF Sync Detector IC5301 ...
Page 50: ... 50 IC Block Diagrams LM4865 Audio Amplifier IC5003 PW168A Scaler Main CPU IC301 ...
Page 52: ...SERVICE MANUAL LV S4U LV S4E ...