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Troubleshooting
NO POWER
IC801 CPU
IC801 CPU
KEY2
KEY2
Power fail
Power fail
Lamp monitor
Lamp monitor
Lamp ON/OFF switch
Lamp ON/OFF switch
IC5801 I/O Expander
IC5801 I/O Expander
Power ON/OFF switch
Power ON/OFF switch
Fan drive
Fan drive
IC809 I/O Expander
IC809 I/O Expander
Temp. monitor
Temp. monitor
10
12
7
10
7
RED
GREEN
LED
LED
RED
GREEN
LED
LED
FRONT INDICATORS
FRONT INDICATORS
119
119
125
125
122
122
144
144
Check that the POW-
ER FAIL signal is
Check that the POW-
correct.
ER FAIL signal is
pin125 of IC801
correct.
L : abnormal
pin125 of IC801
L : abnormal
Check
ON/OFF signal is correct.
Check
pin26 of IC5801
ON/OFF signal is correct.
pin26 of IC5801
26
26
27
27
Check that the FAN DRIVE
signal is correct.
Check that the FAN DRIVE
pin27 of IC5801
signal is correct.
pin27 of IC5801
POWER FAIL
24
24
12
Check that the LAMP ON/OFF
signal is correct. pin144 of
Check that the LAMP ON/OFF
IC801
signal is correct. pin144 of
IC801
RED
LED
RED
LED
Is POWER ON sig-
nal in lamp power
Is POWER ON sig-
on/off button input at
nal in lamp power
Pin119 of IC801 ?
on/off button input at
Pin119 of IC801 ?
ON/OFF SWITCH TOP CONTROL
ON/OFF SWITCH TOP CONTROL
to assy board
to assy board
Check that the TEMP.
MONITOR signal is cor-
Check that the TEMP.
rect. pin24 of IC809
MONITOR signal is cor-
and pin3 of K8E
rect. pin24 of IC809
L : abnormal
and pin3 of K8E
L : abnormal
that
the
POWER
that
the
POWER
H : ON
H : ON
POWER FAIL
IC681 12V DC-DC
FAN
Converter
IC681 12V DC-DC
FAN
Converter
Is fuse (F901) blown?
Is fuse (F901) blown?
AC INPUT
AC INPUT
F901
FUSE
H : ON
H : ON
Are LAMP POWER indicator(red) and READY indica-
tor(green) light? (Front indicators)
Are LAMP POWER indicator(red) and READY indica-
If the LAMP POWER and READY indicators do not light,
tor(green) light? (Front indicators)
check the HOT circuit of primary side and S5V of
If the LAMP POWER and READY indicators do not light,
STANDBY power source circuit.
check the HOT circuit of primary side and S5V of
STANDBY power source circuit.
-42-
Check that the LAMP
MONITOR signal is cor-
Check that the LAMP
rect. pin122 of IC801
MONITOR signal is cor-
and pin16 of K8A
rect. pin122 of IC801
H : abnormal
and pin16 of K8A
H : abnormal
17V
15V
5V
17V
15V
5V
Q5601 Q5603 Q5606
Q5601 Q5603 Q5606
Check the signal at
Pin5 of T631.
Check the signal at
Pin5 of T631.
Switching power
supply
Switching power
supply
SW902
SW901
INTERLOCK
SW902
MAIN SW
F901
SW901
SW
INTERLOCK
FUSE
MAIN SW
SW
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