-43-
7
P.F.C.
control
P.F.C.
SW903
+15V
Abnormal temperature detection
at the periphery of LCD panel
SW904
Interlock SW
Abnormal temperature detection
at the periphery of LAMP
Abnormal temperature
detection at the
periphery of P.F.C.
circuit
TSW601
LAMP
Q661
Q662
RL601
RL602
Lamp power
relay
Is projection of lamp cover
inside broken or not fitting?
Check the INTER LOCK
switch(SW902) and lamp
cover.
SW902 OPEN : abnormal
Is thermal switch(SW903) oper-
ating?
If temperatures periphery of
LAMP reaches 100˚C,
SW903 OPEN: abnormal
Is thermal switch(SW904)
operating?
If temperatures periphery of
LCD panel
reaches 50˚C ,
SW904 OPEN: abnormal
Is thermal switch(TSW601) operating?
If temperature periphery of P.F.C.
circuit reaches 85˚C, the
thermal switch turns on.
TSW601--------------- OPEN: normal
K7D
K7E
Lamp
monitor
Lamp
det.
When an abnormal
temperature is detected at
the periphery of lamp
driver circuit, the voltage of
this line comes HIGH.
When an abnormal
temperature is detected at
the periphery of lamp
driver circuit, the voltage of
this line comes LOW.
the thermal switch turns off.
the thermal switch turns off.
LAMP BALLAST UNIT
Troubleshooting
Содержание PLC-EF10BA
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