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Troubleshooting
●
Lamp Abnormality
■ The Lamp Driving Circuit ( ex. Lamp_3 )
THERMAL SWITCHES
K26U
ASS'Y
EXH FANNET
FANNET_2
3
1
12VA
IC4806
IC4826
IC4826
K6A
K8K
L_RX
IC4827
L_TX
IC4827
ASS'Y BGA
ASS'Y MAIN
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, 90 seconds are required until the light output sta-
bilizes.
■ 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.
NOTE :
■
nterlock Switch
The I
Make sure that the lamp cover is mounted correctly. If not or the lamp cover
removed, the lamp does not lighton for the safety.
Check the boss of the lamp cover and the Interlock switch (SW902).
SW902 -- open : Abnormality
■ The Thermal Switches
When the internal temperature near the lamps reaches near 90-100ºC,
the thermal switches open and 12V_PFC does not supplied to PFC-Unit.
SW903 - SW906 -- open : Abnormality
■ The READY (green) LED indicates lamp monitor operation
LED off:
Lamp is being cooled.
LED on:
Lamp is being lit or already cooled down.
AC INPUT
AC108~264V
K26T
12V_FN
P_FAIL
K56A
GND
K8U
3
P_FAIL_FAN
K8Q
5
12V_FAN_C
4
12V_PFC
6
PFC_ON/OFF_CN3
7
PFC_ON/OFF_CN4
1
P_FAIL_CN3
2
P_FAIL_CN4
8
GND
DC INPUT
DC390~410V
5
LAMP ERROR
4
GND
3
S5V
2
BALLAST ON/OFF
1
LAMP CONTROL
UNIT_PFC3-4
LINE
FILTER
CN5
1
2
H : Abnormality
3
CN6
3
5
4
6
H : ON
7
H : ON
1
L : Abnormality
2
8
L : Abnormality
UNIT_LAMP BALLAST
FILTER
BUFFER
CN1
1
H : Abnormality
2
3
4
L : ON
5
■ When the temperature
around a lamp driver
reaches 95 degrees,
unit lamp ballast will be
shut down and a lamp
monitor signal
changes from L to H .
■ 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.
-65-
U20B47200
BRIDGE
ACTIVE
DIODE
FILTER
THERMAL
PROTECTOR
BRIDGE
ACTIVE
DIODE
FILTER
THERMAL
PROTECTOR
P_FAIL
DETECTOR
P_FAIL
DETECTOR
PRIMARY CIRCUIT
U20B59700
FULL
IGNITION
BRIDGE
CIRCUIT
Output voltage.
At the time of a start :
At the time of stability : AC 87V typ. (67~129V)
Output Frequency : 100 Hz typ.
CONTROL
■ When the output volt-
age reaches abnormal
voltage (exceeds AC
130V), unit lamp bal-
last will be shut down
and a lamp monitor
signal changes from L
to H.
CPU : ---- Lamp monitor operation.----
DC OUTPUT
DC390~410V
DC OUTPUT
DC390~410V
LAMP
ASS'Y_3
8KVp-p
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