Sanyo PLC-EF30, Service Manual

Page: 21 / 92

-23- -22-
ASS'Y POWER
Hot circuit
AC-INPUT
LAMP B
ALLAST
-ON/OFF
PFC-ON/OFF
CPU IC801
and
I / O
EXPANDER
IC1831
PRESSURE
SENSOR
TEMP.
SENSOR
CIRCUIT
SUB POWER
LAMP-MONIT
OR
LAMP
BALLAST units
LAMP
assemblies
PFC units
System Control
INTERLOCK SW
FUSE
SW902
F901
DC out
TEMP.
SENSOR
WARNING
TEMP.
READY
TEMP. SW
THERMAL-Switches
for LAMP assemblies
TEMP. SW
RL-12V
+B
PO
WER-F
AIL
PO
WER-ON/OFF
IIC-SCL & SD
A
AC
DC out
I / O
EXPANDER
POWER
CONTROL
SWITCH
INDICATORS
FAN
ON/OFF
FANS
FANS
PO
WER-F
AIL
CONTROL
LAMP
REPLACE
LAMP
TEMP.
SENSOR
RESET
SWITCH HAND OPERATED RESET
for CPU SW3801
FOR FAN CONTROL
IC5801
ABNORMAL TEMP. DETECT
IC2541
FOR FAN CONTROL
IC886
ABNORMAL TEMP. DETECT
PTH901
The PTH901 does not exist
in some particular models.
Always
Switched
16V /9V /6.25V /-6V
IIC-SCL & SDA
IIC-SCL & SDA
RESET
TEMP. SENSOR
PRESSURE SENSOR
* NO POWER -1
Troubleshooting
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 signal is correct.
L : Abnormality
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 cor-
rect.
L : Abnormality
Check +B(RL12)
voltage for PFC
circuits.
Check that the Lamp mon-
itor signals are correct.
Check that the PFC circuit
on/off signals are correct.
Check that the IIC
Bus signals for fan
control are correct.
Refer to next
page but one
Check that the Lamp
ballast on/off signals
are correct.
Occasionally, this CPU may
malfunction and need to be
reset.