Panasonic PT-EX600U, Service Manual

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Temperature abnormality
IC301
SYSTEM
CONTROL
&
SCAN
CONVERTER
<PW392>
IC5201
FPGA
<XC3S50A>
LAMP
LP900
AC
SW902
THERMAL
FUSE
POWER
A901
LAMP
BALLAST
CHO_RXD
FILTER_DET
WINDS_SENS
Q331
CHO_TXD
PW_MASTER_SDI
PW_MASTER_SDO
PW_MASTER_SCK
LAMP_DC_ON
IC1853
INVERTER
IC1816
TEMP
SENSOR B
<LAMP>
IC3903
IC3902
IC1692
TEMP
SENSOR A
<ROOM>
S901
WIND
SENSOR
IC1814
TEMP
SENSOR C
<PANEL>
IC9885
SUB-CPU
<MB95F353EPFT
>
IC7801
DAC
FAN
CONTROL
<M62393>
LAMP
COVER SW.
1 2
2
2
32
154
251
19
11
4
22
4
SCI
41
343
354
68
20
1
1
29
29
5 1 4
5 1 4
1
3
K8R
K6R
CN1
CN2
K6B
RL602
K601A-1A
K601A-2A
K6A
K8K
K8B
K8E
K8G
K8S
3 5
9
10
7
POWER-ON:H
Normal Standby:H
Network Standby: H
Eco Standby: L
POWER-ON:H
Error: L
Error: L
MAIN
SW1891
K8C
FILTER SW.
3
1
LB_SW
SCI_SW
VD
CON_G
CPU_G
5
POWER_SW
LOW
POWER
SUPPLY
POWER
SUPPLY
SB_5V
S16V
S6V
S-6V
S3.3V
PW_SDA0/SCL0_S5V
PW_SDA0/SCL0
F601
FUSE
FAN LOCK
P.FAIL
COOLING
FANS
1
1
TEMP. indicator blinks
The sensor's operation is as follows:
IC1692 : Inside temperature monitor A (room)
IC1816 : Inside temperature monitor B (lamp)
IC1814 : Inside temperature monitor C (panel)
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 . 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 urgently.
The CPU checks surrounding temperature of LCD panel (IC1814), Lamp (IC1816) and intake air (IC1692). If each
part temperature reaches abnormal temperature, the CPU will turn off the projector, and will blink TEMP. indica-
tor. 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 tempera-
ture reaches 113ºC. When the thermal protector becomes open, it cuts off the AC line to shut down the projector
immediately.
S W 9 0 2 o p e n s a t
113ºC.
Troubleshooting