- 6 -
Circuit Protections
Lamp Cover switch
SW902
When the lamp cover is removed or no close completely,
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 projector
can not be turned on.
Lamp Cover
● Lamp cover switch
● Power Failure Protection
Power failure protection diodes detect abnormal voltage on the power suply circuits or the fan operation stop.
When both of the WARNING TEMP. and READY Indicators are flashing:
READY
LAMP
LAMP REPLACE
WARNING TEMP.
W
ARNING
TEMP.
READ
Y
LAMP
REPLA
CE
LAMP
FRONT INDICATORS
WARNING TEMP.
Indicator
READY
Indicator
READY
LAMP
LAMP REPLACE
WARNING TEMP.
W
ARNING
TEMP
.
READ
Y
LAMP
REPLA
CE
LAMP
REAR INDICATORS
Temperature switches (SW 903~906)
are arranged near the four lamps.
Temperature switches will operate, if
temperature reaches 120 degrees.
Temperature switches
--- open at 120 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)
- 6 -
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/
STAND-BY button on the remote control unit or on the side control. If this case
happenes, 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
To Next Page
Loading...
