Fault Diagnosis By Symptom - Samsung ASHM070VE Service Manual

5-3 Fault Diagnosis by Symptom

5-3-1 When the power voltage is not available
1 ) Inspection items
(1) Is the power voltage is normal? (AC 198V - Ac 264 V)
(2) Is the power cord is correctly connected and is the contact good? ((1) L(black)
(2) N(white) (3) communication (red))
(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
s e q u e n c e .
2 ) Inspection sequence
Is the operation lamp
Y
of indoor unit on when
No trouble
the operation /stop but-
(normal)
ton of remote controller
Is the communication
N
Check of remote signal of remote con-
controller troller surely sent and
Y
between the connector
Normal
of Ass'y display PCB and
the receiving module?
Replace of Ass'y dis-
Samsung Electronics
Is the operation lamp flickering with the
is pressed?
N
Is the outdoor power connected normally?
((1) L(black) (2) H(white) (3) communication
received ?
Y
Is there no problem
Is the fuse (F701, 250V, 3.15A) of PCB cut?
N
Is the voltage at Primary side of trans-
play PCB
former of PCB (TN71)? (AC15V~AC25V)
Is the output voltage of electrostatic volt -
Is the output voltage of electrostatic volt-
Apply the power
sound of "ting"?
N
(red))
Y
N
Y
age IC (KA 7812) DC 10V and 12V?
Y
age IC (KA 7805) DC 4.5 V - 5.5 V?
Y
Replace the main PCB of indoor unit
N
Check of the installation method
and electrical circuit
Y
Replace the fuse (250V, 3.15 A).
N
Transformer is out of order -
replace
Repair and replace the power
N
source rectifying diode (D101-
D105) and KA7812.
N
KA7805 is out of order - replace
5-5