-135-
Troubleshooting
CPU : ---- Lamp monitor operation ----
N
The CPU performs an input check by the lamp monitor
pin (LAMP_RX).
N
When the "H" signal continues 1 second or more con-
tinuously, the CPU judges the state to be abnormal.
N
When it has detected abnormal condition, the CPU
turns off a projector compulsorily. And the CPU sets up
the cooling time for 90 seconds.
N
The projector cannot be turned on during a cooling
time.
NOTE :
N
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
N
Thermal Switches
When the internal temperature near the lamps reaches near 80ºC, the
temperature switches open and 12V is not supplied to PFC1-2 board, also
the Power fail signal "PF_POWER" bocomes "Low".
SW903 - SW904 -- open : Abnormality
N
POWER (green) LED indicates lamp monitor operation
LED off:
Lamp is being cooled.
LED on:
Lamp is being lit or already cooled down.
NOTE :
N
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.
N
After projector turned on, 30 seconds are required until the light output
stabilizes.
N
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.
K6C
POWER(AC)
K6B
LAMP1
LP901
PFC1-2
BALLAST1
BALLAST_AC1
BALLAST_AC2
LAMP2_ON
LAMP2_RXD
LAMP2_TXD
DC_ON
PFC_ON
ST_SW
IC4701
31
CN1
X1A
X2A
X3A
LAMP2
LP902
BALLAST2
X1B
X2B
X3B
CN6
K66N
CN4
CN3
POWER(DC)
K66B
K66L
K8L
K8B
K8Q
Q4701
Q4731
LAMP1_ON
LAMP1_RXD
LAMP1_TXD
IC4731
ID I/F 2
ID I/F 1
IC4401
COLOR
MANAGEMENT
FPGA
<EP3C40F484>
IC1801
I/O
EXPANDER
<TE7783>
IC301
SYSTEM
CONTROL
<PW392>
K8Y
K8Z
IC5808
SS3.3V
LAMPA_1_ID
LAMPA_2_ID
LAMPA_3_ID
LAMPB_1_ID
LAMPB_2_ID
LAMPB_3_ID
PFC_ON1
PFC_ON2
PFC_ON
ST_SW
THERMAL SW
SW904
THERMAL SW
SW903
LAMP CO
VER
SW
SW902
12V
PF_POWER
PFC12V
AC
F901
FUSE
SW901
MAINS
SWITCH
K6A
LAMP ID
LAMP ID
N
The Lamp Driving Circuit
Lamp Abnormality
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 on/
off signals (LAMP1_ON,
LAMP2_ON) are correct.
Lamp-On: H
Check that the lamp power
drive signals (PFC_ON1,
PFC_ON2) are correct.
Power-On: H
DS+750 Service Manual
020-000211-01 Rev. 1 (06-2009)
Содержание DS+750
Страница 1: ...DS 750 S E R V I C E M A N U A L 020 000211 01...
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Страница 47: ...45 Electrical Adjustment Test Points and Locations K66S 1 7 DS 750 Service Manual 020 000211 01 Rev 1 06 2009...
Страница 152: ...150 IC Block Diagrams L BA7078AF Sync Sep IC5321 L M62393FP DAC IC7801 DS 750 Service Manual 020 000211 01 Rev 1 06 2009...
Страница 154: ...152 IC Block Diagrams L K4S641632K SDRAM IC3401 L PW392 Scaler IC301 DS 750 Service Manual 020 000211 01 Rev 1 06 2009...
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