
-56-
Hot circuit
AC-INPUT
CPU IC801
and
I / O
EXPANDER
IC4801
SUB POWER
INTERLOCK SW
CURRENT SENSOR
FUSE
SW902
IC801_234
F901
DC out
WARNING
TEMP.
READY
PO
WER-ON/OFF
IIC-SCL & SD
A
AC
SENSOR
A903
A902
A901
DC out
DC out 25V
I / O
EXPANDER
POWER
CONTROL
SWITCH
INDICATORS
FAN
ON/OFF
FANS
FANS
PO
WER F
AILURE
CONTROL
LAMP
REPLACE
LAMP
Always
Switched
16V /9V /6.35V /-6V
REF. VOLTAGE
RECTIFIER
AMP.
COMPARATOR
LAMP NET
SWITCHING
POWER SUPPLY
ASS'Y POWER
Power on/off
Fan on/off
PFC on/off
Ballast on/off
Power sw
OFF
Power sw
ON
Cooling time after power off.
400~600ms(Stability period of PFC.)
Timing chart
Isn't the lamp cover of
a projector removed?
When it is removed, the
projector cannot be
turned on.
Is fuse (F901) blown?
Fuse may be opened
when either the LAMP
indicator or the READY
indicator isn't Illuminated.
Check the fuse.
For continued safety,
replace it with a new fuse
of the same type
Is the lamp cover attached
correctly? And has not
the boss(Inner side of the
lamp cover) broken?
Check the boss and the
Interlock switch (SW902).
SW902--open: Abnormality
Are the LAMP
indicator(red) and
READY indicator(green)
light?
If the LAMP and READY
indicators are not illuminat-
ed, check the primary cir-
cuit and S5V of standby
power supply circuit.
Check that the
POWER FAIL sig-
nals are correct.
L : Abnormality
Check that the
Vcc-voltages are
correct.
Check that the POWER
ON/OFF signal is correct.
L : Abnormality
Check that the Fan
on/off signal is correct.
L : Abnormality
Check that the IIC
Bus signals for fan
control are correct.
AC INPUT VOLTAGE is over 108V?
The AC SENSOR is provided to prevent damage to the
power supply circuits.
When AC input voltage is under 108V at MAINS SW ON,
the AC SENOR will be operated and the CPU does not
turn the projector on , and the READY indicator flashes.
Check that the AC sensor signal is correct. L : Abnormality
Troubleshooting
●
No Power_2
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