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 pro-
vided. 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-
IC5801 and it checks an atmospheric pressure using pressure sen-
sor-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(PTH901) and
inhalation air(IC5801). If each part temperature reaches to abnormal
temperature, the CPU will turn off the projector, and will blink
WARNING TEMP. indicator at intervals of 0.5 seconds. Cooling fans
operate until temperature returns to normal. Indicator will stop blink,
if temperature 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 110 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 WARN-
ING TEMP. indicators will start flashing.
NOTE : SENSORS OPERATION
■
The sensor's operation is as follows:
IC4849
: For FAN control
PTH901 : Abnormal temperature detection
IC1519
: Inside air temperature monitor
IC5801
: Abnormal temperature detection
and for FAN control
WARNING TEMP. indica-
tor (red) blink?
The projector is turned off
when the temperature
around the LCD panel
reaches abnormal temper-
ature. And a WARNING
TEMP. indicator blinks.
- 63 -
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
reaches 85 degrees, 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-7).
Troubleshooting
●
Temperature Abnormality
IC1801
I/O EXPANDER
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
PTH901
TEMP. SENSOR
IC1519
TEMP. SENSOR
IC5801
TEMP. SENSOR
IC4849
PRESSURE SENSOR
INDICATORS
FAN
CONTROL
FAN
CONTROL
BUFFER
BUFFER
RESET KEY
SW902
LAMP COVER SW
DC-DC
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_ERR1/2/3/4
BLAST_SW1/2/3/4
IIC
65
233
7
211
12
234
Check FAN
circuits.
Check the
temperature
switches.
Summary of Contents for PLV-HD2000E
Page 109: ... 109 IC Block Diagrams ICS1523M Clock Driver IC8209 CXA2151Q RGB Matrix IC271 ...
Page 166: ... 166 MEMO ...
Page 167: ... 167 MEMO ...
Page 168: ... PLV HD2000N E JUL 2006 BB 350 Printed in Japan SANYO Electric Co Ltd ...
Page 194: ...A26 PCB_MA4A BGA side A FANNET_3 K16W MAIN K8L MAIN K401 MAIN K8K MAIN K2203 BGA side B ...
Page 196: ...A28 PCB_MA4A ...
Page 198: ...Diagrams Drawings MA4 HD2000N00 PA4 HD2000E00 ...