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Troubleshooting
Lamp Abnormality
■ The Lamp Driving Circuit
POWER(AC)
AC
K6A
F901
SW901
FUSE
MAINS
SWITCH
PFC_SW
IC5201
PFC_SW3_EX
LVDS
PFC_SW4_EX
DIGITAL SW
<XC3S200A>
BALAST_SW4_EX
BALAST_SW3_EX
LAMP4_TX_EX
IC3401
LAMP3_TX_EX
YE & COLOR
MANAGEMENT
LAMP4_RX
<EP3C80F484>
LAMP3_RX
IC301
POWER_ON_SW
SCALER
<IP00C811>
LAMP_ID_BUSY
LAMP_ID_DATA
LAMP_ID_CLK
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.
NOTE :
Switch
Lamp Cover
■
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 100ºC, the
temperature switches open and 12V is not supplied to PFC board, also the
Power fail signal "PF_TH" bocomes "Low" to stop operating the power supply.
SW903 - SW904 -- open : Abnormality
■ Power (green) LED indicates lamp monitor operation
LED off:
Lamp is being cooled.
LED on:
Lamp is being lit or already cooled down.
K6C
POWER(DC)
K6D
K36A
POWER_ON_SW
PFC_SW
PFC_SW
K36B
K66B
6
7
9
8
3
2
If the Lamp ID board is not mounted
securely, the warning message will
appear on the screen and some func-
tions may be disabled.
Check that the lamp power
drive signals (PFC1_SW,
PFC2_SW) are correct.
Power-On: H
K16B
K16A
PFC
K16C
K16E
K47E
IC6711
14
PFC_SW3
13
PFC_SW4
11
BALAST_SW4
12
BALAST_SW3
17
LAMP4_TX
18
LAMP3_TX
PF_TH
S12V
K88A
K66E
K77L
K17A
MAIN
LAMP FANNET
■ 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.
-164-
Check that the lamp on/off
signals (BALAST_SW1,
BALAST_SW2) are correct.
Lamp-On: 3V, Off: 5V
CN1B
CN3B
BALLAST1
CN2B
CN1C
CN3C
BALLAST2
CN2C
K47F
K47D
IC4781
IC4751
K88B,K88C,K88D
IC1701
K77N
LAMP_ID2
LAMP_ID
K77M
LAMP_ID 1
CPU : ---- Lamp monitor operation ----
LAMP1
LAMP ID
LAMP2
LAMP ID
LAMP ID2
LAMP ID2
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