Advertisement
Troubleshooting
1.Power-on processing
Does
the lamp
to
goes out when
NO
Micro-
POWER switch of
computer
remote control
Volume.
box is turned
ON?
Check S843
(power switch)
and the line
to IC601.
Power-on
processing is OK.
to Power Supply
Volume.
to Power Supply
Volume.
Return to B
and recheck.
Repair the wiring.
To Microcomputer
Volume.
Connect to outlet.
P.STAND-BY
indicating lamp
lights up?
Press POWER switch.
YES
STANDBY
NO
indicating lamp
goes out?
YES
Does FL
light up?
Correct
NO
voltage applied at each
Correct voltage
NO
applied to IC831
(FL driver)?
Check
Oscillating
NO
IC831,R044
wave output from
and C834.
IC831"20"?
Is connection
NO
between IC831"20"
and IC601"5" OK?
YES
Voltage
NO
of CN831"19"
at +5V?
YES
Replace IC831.
Return to B
and recheck.
A
F001
NO
(500mA) fuse
is blown.
YES
Voltage of
IC901"1" at
approx. 12V?
YES
B
Voltage
of IC901"3"
at 5 V?
NO
lead
Micro-
of FL?
computer
Volume.
YES
YES
YES
Voltage
NO
of IC831"13"
(P.ON RESET)
at +5V?
YES
Is connection
of IC831"14"-"15" and
IC601"2" to "4" OK?
YES
To Microcomputer Volume.
YES
Replace
F001.
NO
AC wave
supplied to
NO
T901"12" to "15"
(transformer)
?
YES
Check the soldered
part of the pins of
T901 (transformer)
and the thermal fuse
between "5" and "6".
Return to A
NO
and recheck.
YES
Is IC901
hot?
to
YES
Continuity
OK between IC901"3"
and IC601"73"?
To Microcomputer
Volume.
NO
Repair the
wiring.
Return to A
and recheck.
Check the
wiring
YES
between
D902 or
transformer
to IC901"3".
NO
Return to A
and recheck.
NO
Replace
IC901.
Return to A
and recheck.
NG
Repair the
wiring.
OK
Return to A
and recheck.
Return to B
and recheck.
Advertisement
