Troubleshooting
Samsung Electronics5-8
5-4-2 When the power voltage is not available
1) Inspection items
(1) Is the power voltage is normal? (The rating voltage ±10% range)
(2) Is the power cord is correctly connected and is the contact good?
(3) Does the sound “ting” come out with the operation lamp (green) flickering when the
power is applied?
If it is not flickering, do inspect and repair in accordance with the following inspection
sequence.
2) Inspection sequence
Apply the power
Is the operation lamp
of indoor unit on when
the operation /stop but-
ton of remote controller
is pressed?
Is the communication
signal of remote con-
troller surely sent and
received ?
Is there no problem
between the connector
of Ass’y display PCB and
the receiving module?
Replace of Ass'y dis-
play PCB
Is the fuse (F701, 250V, 3.15A) of PCB open?
Is the voltage at Socondary side of trans-
former of PCB (TN71)? (AC15V~AC25V)
Is the output voltage of voltage regulator
IC (KA 7812) DC 10V and 12V?
Is the output voltage of electrostatic voltage
regulator IC (KA 7805) DC 4.5 V - 5.5 V?
Replace the main PCB of indoor unit
Repair and replace the power
source rectifying diode (D101-
D105) and KA7812.
KA7805 is out of order - replace
Transformer is out of order -
replace
Replace the fuse (250V, 3.15 A).
Is the outdoor power connected normally?
Check of the installation method
and electrical circuit
No trouble
(normal)
Check of remote
controller
Normal
Is the operation lamp flickering with the
sound of “ting”?
Y
N
N
Y
Y
N
N
Y
N
Y
Y
Y
N
N
N
Y
N
Y
DB98_08726A(1)<SM_1 12/19/11 4:35 PM Page 5-8
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