- 65 -
CPU : ---- Lamp monitor operation ----
■
The CPU performs an input check by the lamp moni-
tor pin.
■
When the "H" signal continues 1 second or more
continuously, the CPU judges the state to be abnor-
mal.
■
When it has detected abnormal condition, the CPU
turns off a projector compulsorily. And the CPU sets
up the cooling time for 90 seconds.
■
The projector cannot be turned on during a cooling
time.
NOTE :
■
Lamp Cover
Switch
Make sure that the lamp cover is mounted correctly. If not or the lamp cover
removed, the lamp does not light for safety.
Check the boss of the lamp cover and the lamp cover switch (SW902).
SW902 -- open : Abnormality
■
Temperature Switches
When the internal temperature near the lamps reaches near 110ºC, the
temperature switches open and 12V_PFC is not supplied to PFC-Unit.
SW903 - SW906 -- open : Abnormality
■
READY (green) LED indicates lamp monitor operation
LED off:
Lamp is being cooled.
LED on:
Lamp is being lit or already cooled down.
NOTE :
■
At first, the high-voltage pulse (about 8KVp-p) is generated between the
lamp electrodes to generate glow discharge. Then dielectric breakdown
occurs, finally glow discharge comes to arc discharge.
■
After projector turned on, 30 seconds are required until the light output
stabilizes.
■
After the projector is turned off, the cooling fans operate for 90 seconds to
cool down the lamp and reduce gas pressure inside the lamp.
IC801
MAIN CPU
IC1801
I / O
EXP
ANDER
IC4841/4842
BU
F
FER
FULL
BRIDGE
FILTER
BUFFER
DOWN
CONVERTER
IGNITION
CIRCUIT
LAMP ERROR
GND
GND
BALLAST ON/OFF
NC
CONTROL
LAMP
ASS'Y_3
DC INPUT
DC380~400V
U20C04300
CJ4
UNIT_LAMP BALLAST
CJ2
CJ1
1
2
3
4
5
1
2
3
4
5
Output voltage.
At the time of a start : 8KVp-p
At the time of stability : AC 60~129V
Output Frequency
: 50 Hz typ.
LINE
FILTER
BRIDGE
DIODE
ACTIVE
FILTER
THERMAL
PROTECTOR
P_FAIL
DETECTOR
P_FAIL
DETECTOR
P_FAIL_FAN
12V_PFC
P_FAIL_CN3
P_FAIL_CN4
12V_FAN_C
AC INPUT
AC108~264V
L : Abnormality
L : Abnormality
U20B47200
CN3
UNIT_PFC3-4
CN6
CN1
3
5
4
6
7
1
2
8
3
5
4
6
7
1
2
8
PFC_ON/OFF_CN3
PFC_ON/OFF_CN4
GND
BRIDGE
DIODE
ACTIVE
FILTER
THERMAL
PROTECTOR
CN4
1
2
3
12V_FN
P_FAIL
GND
CN5
H : ON
H : ON
H : Abnormality
DC OUTPUT
DC380~400V
DC OUTPUT
DC380~400V
H : Abnormality
H : ON
D
ATA
B
U
S
ASS'Y MAIN
ASS'Y
EXH FANNET
THERMAL SWITCHES
LAMP COVER
SW
K56A
K8U
K8Q
FANNET_2
K26U
K26Z
K26T
K8W
PRIMARY CIRCUIT
3
1
12VA
PF_TH
■
The Lamp Driving Circuit (
example
Lamp_3 )
■
When the tempera-
ture around a lamp
driver reaches 85
degrees, unit lamp
ballast will be shut
down and a lamp
monitor signal
changes from L to H .
■
When the output volt-
age reaches abnor-
mal voltage (exceeds
AC 130V), unit lamp
ballast will be shut
down and a lamp
monitor signal
changes from L to H.
Troubleshooting
●
Lamp Abnormality
Содержание LC-XT4E
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