-133-
Troubleshooting
Temperature monitor operation
The temperature monitor system is provided to prevents
damage of optical components inside a projector from
overheat. Two protection systems are provided. Each
system operation as follows :
The temperature monitor -1:
L
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 sensors IC8821 and IC1381, and it
checks an atmospheric pressure using pressure sen-
sor IC4781. The CPU judges data from sensors and
controls the air flow of the cooling fans so the tem-
perature inside the projector is maintained to normal
temperature.
L
To shut down the projector urgently.
The CPU checks temperature of DMD module pe-
riphery (IC8821), optical parts periphery (IC1381) and
intake air (IC8811). If each part temperature reach-
es abnormal temperature, the CPU will turn off the
projector, and will blink WARNING TEMP. indicator
at intervals of 0.5 seconds. Cooling fans operate un-
til temperature returns to normal. Indicator will stop
blink, if temperature returns to normal.
The temperature monitor -2 :
L
Temperature check of lamps :
Temperature switches (SW903, SW904) are placed
near the lamps. Temperature switches will operate,
if temperature reaches 80ºC. When temperature
switches become open, they cut off PFC12V line, the
power failure "PF_POWER" signal become Low, and
then the CPU will shut down the projector, and the
LAMP indicator is lighting and other indicators are
blinking.
NOTE : SENSORS OPERATION
N
The sensor's operation is as follows:
IC4781 : Pressure sensor For FAN control
IC1381 : Inside air temperature monitor (Optical)
IC8821 : Inside air temperature monitor (DMD)
IC8811 : Inside air temperature monitor (Room)
LED indicators
W h e n t h e i n t e r n a l t e m p
error, the WARNING TEMP.
indicator will be blinking.
When the temperature rises
a b n o r m a l l y a r o u n d t h e
lamps1 or 2, the LAMP indi-
cator is lighting and other
indicators are blinking.
The temperature
switch is operated?
If the temperature
around FET reaches
105 degrees, a PFC cir-
cuit will be shut down.
The temperature switch is
operated?
When the temperature
around a lamp driver bec-
mes abnormally high, the
lamp ballast will be shut
down and a lamp error sig-
nal changes from L to H.
Temperature sensors location can be seen on
"protections"( page-8).
Temperature Abnormality
AC
F901
FUSE
SW901
MAINS
SWITCH
NOISE
FILTER
K6B
POWER(AC)
K6A
LAMP1
LP901
Cooling
Fans
THERMAL SW
SW904
THERMAL SW
SW903
LAMP COVER
SW
SW902
PFC1-2
BALLAST1
X1A
X3A
LAMP2
LP902
BALLAST2
X1B
X3B
CN6
CN4
CN3
POWER(DC)
FAN
CONTROL
IC2601
FA7729
IC7801
DAC
IC1801
I/O
EXPANDER
IC4401
FPGA
IC5201
FPGA
IC1381
TEMP. SENSER
<OPTICAL>
IC4781
PRESS SENSER
IC8821
TEMP. SENSER
<DMD>
IC8811
TEMP. SENSER
<ROOM>
IC301
SYSTEM
CONTROL
12V
PFC_CN4
PFC_CN3
PFC_ON2
PFC_ON
S-6V
SS6V
S16V
S-6V
SS6V
S16V
ST_SW
PFC_ON
ST_SW
PFC_ON1
PFC12V
PF_PO
WER
DC_ON
BALLAST_AC1
BALLAST_AC2
P.FAIL
FAN_DAC
FAN_SW1
FAN_SW2
IIC
IIC
IIC
FAN_ERR
Lamp Mode Lamp1 Lamp2 Lamp1/2
PFC_ON1 H L H
PFC_ON2 L H H
ST_SW: L
PFC_ON: H
Power-on: H
Stand-by: L
PRESS_SENS
Check FAN
circuits.
Check the
temperature
switches.
Opens at 80ªC
DS+750 Service Manual
020-000211-01 Rev. 1 (06-2009)
Содержание DS+750
Страница 1: ...DS 750 S E R V I C E M A N U A L 020 000211 01...
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Страница 47: ...45 Electrical Adjustment Test Points and Locations K66S 1 7 DS 750 Service Manual 020 000211 01 Rev 1 06 2009...
Страница 152: ...150 IC Block Diagrams L BA7078AF Sync Sep IC5321 L M62393FP DAC IC7801 DS 750 Service Manual 020 000211 01 Rev 1 06 2009...
Страница 154: ...152 IC Block Diagrams L K4S641632K SDRAM IC3401 L PW392 Scaler IC301 DS 750 Service Manual 020 000211 01 Rev 1 06 2009...
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