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Troubleshooting
IIC BUS
TEMP.
SENSOR
IC2831
Abnormal temperature detection on
the Main board.
Check that the FAN DRIVE
signal at pin 19 of IC1804 is
correct.
H : Power ON
S6V
5V_SW.
Check signal at pin 5
of T651
IC2641 ~ IC2681
LAMP_BST_SW
LAMP_ERR
LAMP_SW
PSDA
PSDA
Is projection of lamp cover inside
broken or not fitting correctry ?
Check the interlock switch (SW904)
and lamp cover.
SW904 -- OPEN : abnormal
15V
5V
Q671, Q681
Is thermal switch (SW902) operating ?
If peripheral temperatures at the lamp
house reaches 100˚C, the thermal
switch turns off.
SW902 -- OPEN: abnormal
Switching power
supply
7
When an abnormal
Check that the thermal switch (TSW611)
temperature is detected at
is operating.
the periphery of lamp
If temperature at peraiphery of P.F.C.
driver circuit, the voltage of
circuit reaches 95˚C, TSW611 turns on.
this line comes HIGH.
TSW611 -- OPEN: Normal
TEMP. BOARD
TEMP.
SENSOR
IC2832
Abnormal temperature detection inside
of the projector.
Interlock switch
Abnormal temperature
detection at the
periphery of P.F.C.
circuit
TSW611
P.F.C.
control
CB1
P.F.C.
LAMP.DET
(Error: H)
-33-
SW902
LAMP BALLAST UNIT
CB2
CB2
LAMP
SW.
K8CC-1
K8CC-4
(Power-On: H)
SW904
LAMP
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