Sanyo PLC-EF31 Service Manual page 28

LAMP ABNORMALITY -2
Check the unit P.F.C..
Caution : "HOT" Circuit !
Check! UNIT PFC
CN1B
AC-INPUT
AC 90V~264V
TEMP. SW
12V (+B)
RL12
PFC-2 ON/OFF
IC1801
I /O EXP.
PFC-1 ON/OFF
CN2B
Check!
Check the unit lamp Ballast.
Caution : "HOT" Circuit !
UNIT LAMP BALLAST
K7B
UNIT P.F.C.
DC INPUT
DC380~400V
K7A
Check!
IC1801
I/O EXP.
Check!
Troubleshooting
U20B34600
H: ON
H: ON
Check!
STABILISER
( CHOPPER )
Check!
LAMP MONITOR
H : Abnormality
LAMP ON/OFF
H : ON
MAINS ISOLATION
Has not the temperature
switch operated?
If the temperature around
FET reaches 85 degrees, the
PFC circuit will be shut down.
PFC-1
CONTROL
FET
TEMP. SW
85˚C
PFC-2
CONTROL
FET
TEMP. SW
85˚C
When the temperature
around a lamp driver reaches
85 degrees, unit lamp ballast
will be shut down and a lamp
monitor signal changes to H
from L.
U20B39500/39800
LAMP
DRIVER
TEMP.
SENSOR
85˚C
CONTROL
When this output voltage
reaches abnormal voltage
(exceeds AC-130V), unit lamp
ballast will be shut down and a
lamp monitor signal changes
from L to H.
-28-
Check!
OUTPUT
DC 380V~400V
LAMP
BALLAST-1
CN3B
BALLAST-1 ON/OFF
LAMP-1 MONITOR
LAMP
BALLAST-2
CN4B
BALLAST-2 ON/OFF
LAMP-2 MONITOR
Check!
LAMP
K7C
ASS'Y
IGNITER
Output voltage.
At the time of a start : 20KVp-p
At the time of stability : AC 85V typ. (70~100V)
Output Frequency : 88 Hz typ.
Check!