-26-
ASS'Y POWER
Hot circuit
AC-INPUT
CPU IC801
and
I / O
EXPANDER
IC1831
SUB POWER
System Control
INTERLOCK SW
FUSE
SW902
F901
DC out
WARNING
TEMP.
READY
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
Always
Switched
16V /9V /6.25V /-6V
NOTE :
Light source lamp
■
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 val-
ues 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 pressure inside the lamp.
During this "cooling down" period, the projector cannot be turned on.
CPU : Lamp monitor operation.
■
CPU performs an input check by the lamp monitor pin.
■
When the "H" signal continues 1 second or more continuously,
CPU judges the state to be abnormal.
■
When it has detected abnormal condition, CPU turns off a pro-
jector 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
LAMP ABNORMALITY -1
Troubleshooting
Содержание PLC-EF31
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Страница 103: ...Memo ...
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