- 68 -
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 :
------ The temperature monitor -1: -----------------------------------
■
To control the air-flow of the cooling fans.
The CPU checks the temperature and atmospheric pressure inside a
projector. It checks a temperature using temperature sensor-IC2541
and it checks an atmospheric pressure using pressure sensor-IC886.
The CPU judges data from sensors and controls the air flow of the
cooling fans so the temperature inside the projector is maintained to
normal temperature.
■
To shut down the projector urgent.
The CPU checks temperature of LCD panel periphery(Z8P & TH) and
inhalation air(IC5801). If each part temperature reaches to abnor-
mal temperature, the CPU will turn off the projector, and will blink
WARNING TEMP. indicator at intervals of 0.5 seconds. Cooling fans oper-
ate until temperature returns to normal. Indicator will stop blink, if tem-
perature returns to normal.
------ The temperature monitor -2 : ----------------------------------
■
Temperature check of lamps :
Temperature switches are arranged near the lamps. Temperature
switches will operate, if temperature reaches 12 0 degrees. When
temperature switches become open, they cut off 12V_PFC line, the
power failure "PF_TH" signal become Low, and then the CPU will shut
down the projector, and b
oth of READY and WARNING TEMP.
indicators will start flashing.
NOTE : SENSORS OPERATION
■
The sensor's operation is as follows:
IC886
: For FAN control
PTH901 : Abnormal temperature detection
IC2541
: Inside air temperature monitor
IC5801
: Abnormal temperature detection and
for FAN control
WARNING TEMP. indicator
(red) blink?
The projec tor is turned
off when the temperature
around the LCD panel reach-
es abnormal temperature.
And a WARNING TEMP. indi-
cator blinks.
The temperature
switch is operated?
If the temperature
around FET reaches 85
degrees, a PFC circuit
will be shut down.
The temperature switch is
operated?
When the temperature
around a lamp driver reach-
es 85 degrees, the lamp bal-
last will be shut down and
a lamp error signal changes
from L to H.
Temperature sensors location can be seen on
"protections"( page-8).
Troubleshooting
●
Temperature Abnormality
IC801
CPU
R/C
FAN
FAN
ASS'Y
POWER
UNIT_SUB POWER
NOISE
FILTER
AC
SENSOR
AC
INPUT
BALLAST
1/2/3/4
P.F.C.
1/2/3/4
LAMP_1/2/3/4
Z8P & TH
TEMP. SENSOR
IC2541
TEMP. SENSOR
IC5801
TEMP. SENSOR
IC886
PRESSURE SENSOR
INDICATORS
FAN
CONTROL
FAN
CONTROL
RESET KEY
SW902
LAMP COVER SW
DA
CONVERTER
SW903/904/905/906
THERMAL SW
MAINS
SW
FUSE
SWITCHING
POWER
SUPPLY
PRIMARY CIRCUIT
PF_
FANS
POWER
FAIL
POWER
FAIL
12VA
12V
PF_TH
LAMP1/2/3/4
PF_PFC1/2/3/4
PWR_SW
BLAST_SW1/2/3/4
IIC
IC5851
IO
IC1881
Check FAN
circuits.
Check the
temperature
switches.
Содержание PLC-XF47
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