Sanyo PLC-XF30, Service Manual

Page: 22 / 88

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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
NOTE :
■ The lamp emits light through arc discharge. To initiate arc discharge, dielectric breakdown must
occur between the lamp electrodes. The high-voltage pulse generator generates and applies high-
voltage pulses with peak values of about 20kV between the lamp electrodes in order to generate
glow discharge. This in turn results in dielectric breakdown between the electrodes, causing a shift
from glow discharge to arc discharge.
■ After projector turned on, 30 seconds are required until the light output stabilizes. After the projector
is turned off, the cooling fan operates for 90 seconds to cool down the lamp and reduce gas pres-
sure inside the lamp. During this "cooling down" period, the projector cannot be turned on.
NOTE :
■ The lamp-ballast-unit controls the power supply
to the lamp to maintain and stabilize the arc dis-
charge, keeping illumination at a constant level.
■ If the lamp does not light or is extinguished sud-
denly, the "Hi" signal is fed to I/O expander and
CPU. (Lamp monitor signal)
CPU : ---- Lamp monitor operation.----
■
CPU performs an input check by the lamp monitor pin.
■ When the "H" signal continues 1 second or more continu-
ously, CPU judges the state to be abnormal.
■ When it has detected abnormal condition, CPU turns off a
projector compulsorily. And CPU sets up the cooling time for
90 seconds.
■ The projector cannot be turned on during a cooling time.
NOTE :
■
The ready (green) LED indicates lamp monitor
operation as follows:
LED off:
Lamp is being cooled.
LED on: Lamp is being lit or already cooled down.
Isn't the lamp cover of a projec-
tor removed?
When it is removed, the projector
cannot be turned on.
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
Refer to next page
CHECK !
CHECK !
CHECK !
LAMP ABNORMALITY -1
Troubleshooting