Sensors/Switches - Epson PowerLite 5000 Service Manual

fuse on this board is connected to the ground through a resistance (88 Ω).
Consequently, the fuse is blown and the LLIFE signal is switched from HIGH to LOW.
When LLIFE becomes LOW, IC600 switches LPCTL to HIGH and shuts down the lamp
power (65 VDC) from the power supply unit. When the power is shut off, and LPST
(LPFAL) becomes HIGH, IC600 detects power off in the lamp and starts the cooling
down sequence.

2.13 SENSORS/SWITCHES

The following devices listed in the table are installed in the projector for safe operation and
prevention of malfunctions.
Table 2-7 Sensors/switches
Name
Filter cover switch
Interlock switch
Safety switch
Lamp thermistor
LV thermistor
PBS thermistor
Location/Type
Micro switch on the lower
case
Push-switch on the power
supply unit
Thermal switch on the lamp
outer housing
Thermistor on the lamp outer
housing
Thermistor on the prism duct
Thermistor on the side of the
power supply unit
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EPSON PowerLite 5000 Service Manual
Function/Use
Turns power off when the filter
cover is open. (Power on is
disabled.)
Turns power off when the
lamp cover is open. (Power on
is disabled.)
Overheating protection for the
lamp area. Power is shut off if
the temperature exceeds a
specified limit.
Overheating protection for the
lamp area. Power is shut off if
the temperature exceeds a
specified limit.
Overheating protection for the
light bulb. Power is shut off
when the temperature
exceeds a specified limit.
Overheating protection for the
power supply unit. Power is
shut off when the temperature
exceeds a specified limit.