Temperature Abnormality - Christie LX605 Service Manual

Troubleshooting

Temperature Abnormality

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:
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 IC1692, IC1814, IC1816
and it checks an atmospheric pressure using pres-
sure sensor IC886. The CPU judges data from sen-
sors and controls the air flow of the cooling fans so
the temperature inside the projector is maintained to
normal temperature.
SW902 opens at 115ºC.
AC
K6AA
POWER
Error: L
P.FAIL
Error: L
FAN LOCK
IC5201
FPGA
COOLING
FANS <XC3S50A>
IC7801
DAC
FAN
CONTROL
<M62393>
PW_SDA0/SCL0
SW902
THERMAL
PROTECTOR
F601 K6B
FUSE
RL601
A902
POWER-ON:H
32
LAMP_DC_ON
154 8
PW_MASTER_SDI
IC9885
IC301 251 7
PW_MASTER_SDO SUB-MICON
SYSTEM
<LC87F2G>
41 9
CONTROL
PW_MASTER_SCK
&
SCAN
343
CONVERTER
<PW392>
68
281
IC886
PRESS_SENS
PRESS
SENSOR
PW_SDA0/SCL0
To shut down the projector urgently.
The CPU checks surrounding temperature of LCD
panel (IC1814), Lamp (IC1816) and intake air (IC1692).
If each part temperature reaches abnormal tempera-
ture, the CPU will turn off the projector, and will blink
WARNING TEMP. indicator. Cooling fans operate until
temperature returns to normal. Indicator will stop blink,
if temperature returns to normal.
The temperature monitor -2 :
Temperature check of lamp :
Thermal protector (SW902) is placed near the lamp.
Thermal protector will operate, if the surrounding tem-
perature reaches 115ºC. When the thermal protector
becomes open, it cuts off the AC line to shut down the
projector immediately.
LOW K6A CJ1
POWER
SB_5V
SUPPLY
S16V
POWER
S6V
SUPPLY
S-6V
K6R
CJ2
1 29
1 29
K8K
K8R
Network Standby: H
Eco Standby: L
POWER-ON:H
10
POWER_SW
IC1853
14
LAMP_SWIN
INVERTER
15 1
CHO_TXD
16
5
Q331
CHO_RXD
MAIN
WARNING TEMP. indicator blinks
The sensor's operation is as follows:
IC886 : Pressure sensor for FAN control
IC1692 : Inside temperature monitor A (room)
IC1816 : Inside temperature monitor B (lamp)
IC1814 : Inside temperature monitor C (panel)
-70-
LAMP
LP900
A901
LAMP
BALLAST
5 1 4
5 1 4
LAMP
K8B
Q1861 COVER SW.
3
SW901
1
2 FILTER SW.
K8E
S3.3V
1
3
SW1891
FILTER_DET
3
K8C
S901
WINDS_SENS
WIND
SENSOR
IC1816
TEMP
SENSOR B
<LAMP>
K8A
IC1692
TEMP
SENSOR A
<ROOM>
K8S
IC1814
TEMP
SENSOR C
<PANEL>
LX505/605 Service Manual
020-000233-01 Rev.1 (12-2009)