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Circuit Protections
Lamp Cover switch
SW902
When the lamp cover is removed or no close com-
pletely, the lamp cover switch (SW902) cuts off
12V_PFC line to the PFC unit, and then a projector
will be shut down.
After opening the lamp cover for replacing the lamp
unit, place the lamp cover correctly, otherwise the pro-
jector can not be turned on.
Lamp Cover
● Lamp cover switch
● Power Failure Protection
Power failure protection diodes detect abnormal voltage on the power supply circuits or the fan operation stop.
When both of the WARNING TEMP. and READY Indicators are flashing:
When the projector detects an internal problem, it will shut down
automatically and both of the WARNING TEMP. and READY Indicators starts
flashing. In this condition, the projector cannot be turned on even if you press
the POWER ON-OFF button on the remote control unit or on the side control.
If this case happened, disconnect and reconnect the AC power cord, and
then turn on the projector again to check its operation. If the projector shuts
down again or fails to be turned on, the internal check and repair will be
required.
Check items listed below;
● Power Failure Protection
● AC Current Sensor (See the previous page.)
● Temperature Check of Lamps
● Lamp Cover Switch
REAR INDICATORS
Temperature switches (SW 903~906)
are arranged near the four lamps.
Temperature switches will operate, if
temperature reaches 110 degrees.
Temperature switches
--- open at 110 degrees.
SW903 ---Lamp1
SW904 ---Lamp2
SW905 ---Lamp3
SW906 ---Lamp4
When temperature switches become
open, they cut off 12V_PFC line to
PFC(power factor control) unit, and
then a projector will be shut down.
● Temperature Check of Lamps
Temperature switch
SW906 (For Lamp4)
Temperature switch
SW905 (For Lamp3)
Temperature switch
SW903 (For Lamp1)
Temperature switch
SW904 (For Lamp2)
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