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Troubleshooting
No Power
Are the LAMP indicator (red) and
POWER indicator (green) light?
If the LAMP and POWER indicators
are not light, check the primary
circuit and SS6V of standby power
supply circuit.
Check that IIC
Bus signals are
correct.
IC4781
PRESS_SENS
PRESS SENSER
IC1381
IIC
IIC
TEMP. SENSER
<OPTICAL>
IC301
IC8821
SYSTEM
TEMP. SENSER
CONTROL
<DMD>
IIC
IC8811
TEMP. SENSER
<ROOM>
IC4401
FPGA
EXPANDER
BALLAST_AC1
BALLAST_AC2
Check that POWER ON/OFF signal
(DC_ON) is correct.
ON: H, Standby: L
AC
F901
SW901
FUSE
MAINS
SWITCH
Is fuse (F901) blown?
Fuse may be opened
when either LAMP indi-
cator or POWER indicator
does not light. Check
the fuse.
For safety, replace it with
a new fuse of the same
type
Check that POWER FAIL sig-
nals are correct.
L : Abnormality
P.FAIL
FAN_ERR
IC5201
FPGA
FAN_DAC
FAN_SW1
IC2601
IC7801
FA7729
DAC
FAN_SW2
Power-on: H
IC1801
Stand-by: L
I/O
DC_ON
K6A
NOISE
FILTER
POWER(AC)
Check that Vcc voltages
are correct.
Check the temperature
switches.
Thermal switches will open at
around 80ºC.
FAN
CONTROL
PFC12V
Lamp Mode Lamp1 Lamp2 Lamp1/2
PFC_ON1
H
L
H
PFC_ON2
L
H
H
PFC_ON1
PFC_ON2
ST_SW: L
PFC_ON: H
POWER(DC)
CN4
CN6
K6B
PFC1-2
CN3
Check that PFC circuit on/
off signals are correct.
-127-
Is the lamp cover attached correctly?
When the lamp cover is removed
or not attached correctly, the
projector cannot be turned on.
Check the lamp cover and the lamp
cover switch (SW902).
SW902--open: Abnormality
Cooling
Fans
THERMAL SW
SW904
THERMAL SW
SW903
LAMP COVER
SW
SW902
Check 12V
for PFC.
X1A
X3A
LAMP1
BALLAST1
LP901
X1B
X3B
LAMP2
BALLAST2
LP902
Check that the Lamp bal-
last on/off signals are
correct.
DS+750 Service Manual
020-000211-01 Rev. 1 (06-2009)
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