Sanyo PLC-XF35 Service Manual page 31

Has not the temperature
switch operated?
If the temperature around FET
reaches 85 degrees, a PFC
circuit will be shut down.
PFC units
POWER
FAILURE
CIRCUIT
POWER
FAILURE
BUFFER
❐
Cooling fans drive power control.
CPU checks the temperature and atmo-
spheric pressure inside a projector. And
CPU controls the drive power of the cool-
ing fans so the temperature inside the pro-
jector is maintained to normal temperature.
Has not the temperature switch
operated?
When the temperature around a
lamp driver reaches 85 degrees, unit
lamp ballast will be shut down and a
lamp monitor signal changes from L
to H.
TEMP. SW
LAMP
BALLAST units
RL-12V
❐
Projector shut down.
CPU performs temperature check
around the LCD panel using tempera-
ture sensor IC2541 (B-side of assembly
main). If this temperature reaches 47
degrees, CPU will turn off a projector,
and will blink TEMPERATURE WARN-
ING indicator at intervals of 0.6 sec-
onds.
TEMP. SW
LAMP
assemblies
THERMAL-Switches
for LAMP assemblies
Have not the temperature switches operated?
Temperature switches are arranged near each lamp.
Temperature switches will operate, if temperature reach-
es 85 - 90 degrees.
When temperature switches have operated, lamp ballast
units will be shut down, then a projector will be turned off.
I Note :
CPU does not check operation of temperature switches.
Therefore, when temperature switches have operated
and a projector has shut down, TEMPERATURE-WARN-
ING indicator does not blink.
RESET
IIC-SCL & SDA
PRESSURE SENSOR
IIC-SCL & SDA
TEMP. SENSOR
-31-
+B
RESET HAND OPERATED RESET
SWITCH for CPU SW3801
FOR FAN CONTROL
TEMP.
IC5801
SENSOR
FOR FAN CONTROL
PRESSURE
IC886
SENSOR
ABNORMAL TEMP. DETECT
TEMP.
IC2541
SENSOR
TEMP.
ABNORMAL TEMP. DETECT
SENSOR
PTH901
The PTH901 does not exist
in some particular models.
Temperature sensors location can see
it on "protections"( page-5).