Sanyo PLC-EF31 Service Manual page 22

System Control
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
Hot circuit
FUSE
F901
AC-INPUT
Check that the
POWER FAIL sig-
nals are correct.
L : 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.
INDICATORS
* NO POWER -1
Isn't the lamp cover Is the lamp cover attached
of a projector correctly? And has not the
removed? boss(Inner side of the lamp
cover) broken?
When it is removed, the
projector cannot be Check the boss and the
turned on. Interlock switch (SW902).
SW902--open: Abnormality
INTERLOCK SW
SW902
FANS
FANS
Check that the Fan
on/off signal is cor-
rect.
L : Abnormality
LAMP
REPLACE
WARNING
TEMP.
READY
LAMP
-22-
Troubleshooting
Refer to page 24
ASS'Y POWER
DC out
16V /9V /6.25V /-6V
POWER
CONTROL
FAN
ON/OFF CONTROL
I / O
EXPANDER
SUB POWER
Check that the IIC
Bus signals for fan
control are correct.
Power sw Power sw
ON OFF
Power on/off
Fan on/off
PFC on/off
Ballast on/off
Cooling time after power off.
400~600ms(Stability period of PFC.)
AC
Always
DC out
SWITCH
Switched
Check that the
Vcc-voltages are
correct.
Check that the POWER
ON/OFF signal is correct.
L : Abnormality
CPU IC801
and
I / O
EXPANDER
IC1831
Timing chart