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Troubleshooting
CPU : ---- Lamp monitor operation ----
■
The CPU performs an input check by the lamp monitor
pin (LAMP_RX).
■
When the "H" signal continues 1 second or more con-
tinuously, the CPU judges the state to be abnormal.
■
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 90ºC, the
temperature switches open and 12V is not supplied to PFC1-2 board, also the
Power fail signal "PF_TH" bocomes "Low".
SW903 - SW904 -- 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.
IC5861
FPGA(NIOS)
IC5801
FPGA(I/O)
IC1881
BU
FF
ER
FULL
BRIDGE
FILTER
BUFFER
DOWN
CONVERTER
IGNITION
CIRCUIT
LAMP3_RX
BLAST_SW3
GND
S5V
LAMP3_TX
CONTROL
LAMP1
DC INPUT
DC380~400V
CN3
BALLAST1
CN2
CN1
1
2
3
4
5
1
2
3
4
5
Output voltage.
No load Voltage Range : DC180 ~ 210V
At Lamp Lighting stability Range: AC 77 ~ 150V
Output Power.
Rated Power Range : 330 9W
Reduced Power Range : 264 ~325.6 9W
LINE
FILTER
BRIDGE
DIODE
ACTIVE
FILTER
THERMAL
PROTECTOR
P_FAIL
DETECTOR
P_FAIL
DETECTOR
PF_PFCFAN2 (n/a)
SW904
SW903
SW902
12V
PF_PFC3
PF_PFC4
FAN12V
AC INPUT
AC85~264V
L : Abnormality
L : Abnormality
CN3
PFC1-2
CN6
CN1
3
5
4
6
7
1
2
8
3
5
4
6
7
1
2
8
LAMP3
LAMP4
GND
BRIDGE
DIODE
ACTIVE
FILTER
THERMAL
PROTECTOR
CN4
H : ON
H : ON
DC OUTPUT
DC380~400V
DC OUTPUT
DC380~400V
H : Abnormality
H : ON
MAIN
LAMP FANNET
THERMAL SWITCHES
LAMP COVER
SW
K88A
K8U
K8Q
K88C
K88D
K88B
K8W
PRIMARY CIRCUIT
3
1
12VA
+
-
+
-
PF_TH
■
The Lamp Driving Circuit (
example
Lamp_1 )
■
When the temperature
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 abnormal
voltage (exceeds AC
130V ), lamp ballast
board will be shut down
and a lamp monitor sig-
nal changes from L to H.
Lamp Abnormality
