Sanyo PLC-XU22E Service Manual page 36

Troubleshooting
Is thermal switch (SW901)
operating ?
If peripheral temperatures at
the optical unit reaches 85˚C,
the thermal switch turns off.
SW901 -- OPEN: abnormal
7
Abnormal temperature detection at the
periphery of optical unit.
SW901
Is projection of lamp cover inside
broken or not fitting correctry ?
Check the interlock switch (SW904)
and lamp cover.
SW904 -- OPEN : abnormal
Interlock switch
SW904
Is thermal switch (SW902) operating ?
If peripheral temperatures at the lamp
house reaches 100˚C, the thermal
switch turns off.
SW902 -- OPEN: abnormal
Abnormal temperature
detection at the
periphery of P.F.C.
circuit
TSW611
P.F.C.
control
P.F.C.
Check that the thermal switch (TSW611)
is operating.
If temperature at peraiphery of P.F.C.
circuit reaches 90˚C, TSW611 turns on.
TSW611 -- OPEN: Normal
-35-
SW902
When projector turns on,
LAMP SW signal comes
LOW.
LAMP
SW.
CB2
LAMP BALLAST UNIT
SW901
When an abnormal
temperature is detected at
the periphery of lamp
driver circuit, the voltage of
this line comes HIGH.
LAMP.DET
CB2
LAMP