Sanyo PLC-XF30, Service Manual

Page: 24 / 88

-31- -30-
ASS'Y POWER
Hot circuit
AC-INPUT
LAMP B
ALLAST
-ON/OFF
PFC-ON/OFF
CPU IC801
and
I / O
EXPANDER
IC1831
PRESSURE
SENSOR
TEMP.
SENSOR
CIRCUIT
SUB POWER
LAMP-MONIT
OR
LAMP
BALLAST units
LAMP
assemblies
PFC units
System Control
INTERLOCK SW
FUSE
SW902
F901
DC out
TEMP.
SENSOR
WARNING
TEMP.
READY
TEMP. SW
THERMAL-Switches
for LAMP assemblies
TEMP. SW
RL-12V
+B
PO
WER-F
AIL
PO
WER-ON/OFF
IIC-SCL & SD
A
AC
DC out
I / O
EXPANDER
POWER
CONTROL
SWITCH
INDICATORS
FAN
ON/OFF
FANS
FANS
PO
WER-F
AIL
CONTROL
LAMP
REPLACE
LAMP
TEMP.
SENSOR
RESET
SWITCH HAND OPERATED RESET
for CPU SW3801
FOR FAN CONTROL
IC5801
ABNORMAL TEMP. DETECT
IC2541
FOR FAN CONTROL
IC886
ABNORMAL TEMP. DETECT
PTH901
The PTH901 does not exist
in some particular models.
Always
Switched
16V /9V /6.25V /-6V
IIC-SCL & SDA
IIC-SCL & SDA
RESET
TEMP. SENSOR
PRESSURE SENSOR
NOTE : Temperature monitor operation.
■ The temperature monitor system is provided to prevents damage of optical components (the
LCD panel and polarization film etc.) inside a projector from overheat. Two protection systems
are provided.
Each system operation as follows ;
■
Temperature monitor -1.
---
To control the driving power of the cooling fans.
----
CPU checks the temperature and atmospheric pressure inside a projector. And CPU controls the
drive power of the cooling fans so the temperature inside the projector is maintained to normal
temperature.
---- To shut down the projector. ---
CPU checks temperature of LCD panel periphery and inhalation air(IC5801). If each part temper-
ature reaches to abnormal temperature, CPU will turn off a projector, and will blink TEMPERA-
TURE WARNING indicator at intervals of 0.6 seconds. Cooling fans operate until temperature
returns to normal. Indicator will stop blink, if temperature returns to normal.
■
Temperature monitor -2. --- (Temperature check of lamps) . ----
Temperature switches are arranged near each lamp. Temperature switches will operate, if tem-
perature reaches 90 - 100 degrees.
When temperature switches have operated, lamp ballast units will be shut down, then a projec-
tor will be turned off.
Note. CPU does not check operation of temperature switches. Therefore, when temperature
switches have operated and a projector has shut down, TEMPERATURE-WARNING indicator
does not blink.
TEMPERATURE ABNORMALITY -1
Troubleshooting
NOTE : CPU OPERATION
■
CPU (IC801) performs an input check by the IIC-SDA
signal pin.
■
When it has detected abnormal condition, CPU turns off
the projector compulsorily. Cooling fans operate until
temperature returns to normal. Moreover, a projector
cannot be turned on during this period.
*
NOTE : TEMP. MONITOR LED OPERATION
■
The red LED indicates temperature monitor operation as follows:
LED off: Normal temperature.
LED flashes in 0.6 second interval: Abnormality temperature.
Doesn't the temperature warn-
ing indicator (red) blink?
The projector is turned off when
the temperature around the LCD
panel reaches 46 - 48 degrees.
And a temperature warning indi-
cator blinks.
Has not the temperature
switch operated?
If the temperature around FET
reaches 85 degrees, a PFC
circuit will be shut down.
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.
Refer to next
page but one
CHECK !
CHECK !
CHECK Fan
❐
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.
Have not the temperature switches operated?
Temperature switches are arranged near each lamp.
Temperature switches will operate, if temperature reach-
es 90 - 100 degrees.
When temperature switches have operated, lamp ballast
units will be shut down, then a projector will be turned off.
■ 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.
❐
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.
Temperature sensors location can see it on "protections"( page-5).