Sanyo PLC-EF30 Service Manual page 21

* NO POWER -1
System Control
Is fuse (F901) blown? Isn't the lamp cover Is the lamp cover attached
Fuse may be opened
of a projector correctly? And has not the
when either the LAMP removed? boss(Inner side of the lamp
indicator or the READY
cover) broken?
indicator isn't Illuminated.
When it is removed, the
Check the fuse.
projector cannot be Check the boss and the
For continued safety,
turned on. Interlock switch (SW902).
replace it with a new fuse
SW902--open: Abnormality
of the same type
Hot circuit
INTERLOCK SW
FUSE
F901
AC-INPUT
SW902
Check that the
FANS
POWER FAIL sig-
nals are correct.
FANS
L : Abnormality
Check that the Fan
on/off signal is cor-
rect.
L : Abnormality
Are the LAMP
indicator(red) and READY
LAMP
indicator(green) light?
REPLACE
WARNING
If the LAMP and READY
TEMP.
indicators are not illuminat-
ed, check the primary cir-
READY
cuit and S5V of standby
power supply circuit.
LAMP
INDICATORS
Troubleshooting
Refer to next
page but one
ASS'Y POWER
AC
DC out
16V /9V /6.25V /-6V
Always
DC out
POWER
SWITCH
CONTROL Switched
FAN Check that the
ON/OFF CONTROL
Vcc-voltages are
correct.
I / O
EXPANDER
SUB POWER
Check that the IIC Check that the POWER
Bus signals for fan
ON/OFF signal is correct.
control are correct.
L : Abnormality
CPU IC801
and
I / O
EXPANDER
IC1831
Power sw Power sw
Timing chart
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.)
-22-
TEMP. SW
LAMP
PFC units
BALLAST units
RL-12V
Check +B(RL12)
voltage for PFC
circuits.
CIRCUIT
Check that the POWER
FAIL signal is correct.
Check that the Lamp
L : Abnormality
ballast on/off signals
are correct.
Check that the PFC circuit
on/off signals are correct.
TEMP. SW
LAMP
assemblies
+B
THERMAL-Switches
for LAMP assemblies
Check that the Lamp mon-
itor signals are correct.
Occasionally, this CPU may
malfunction and need to be
reset.
RESET HAND OPERATED RESET
RESET
SWITCH for CPU
FOR FAN CONTROL
TEMP.
IIC-SCL & SDA
IC5801
SENSOR
FOR FAN CONTROL
PRESSURE
PRESSURE SENSOR
SENSOR IC886
ABNORMAL TEMP. DETECT
TEMP.
IIC-SCL & SDA
IC2541
SENSOR
TEMP. SENSOR
TEMP. ABNORMAL TEMP. DETECT
SENSOR
PTH901
The PTH901 does not exist
in some particular models.
-23-
SW3801