Samsung AD18A1C09, Service Manual

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9
Normal of out-
door PCB
Replace the fuse (F701)
250V 3.15A.
Replace the
transformer
Assemble the transformer in
the normal way.
Put the power off and put it on after 5 sec-
onds.
Replace the outdoor unit Ass'y main PCB.
Reinstall the power cord and
communication line with the ref-
erence of installation manual.
Replace the fuse F101 (250V 2 A).
Replace the IC 02 (KA7805)
Check and Replace the rectifying
diode of power side (D101 -
D104) and KA 7812.
After watching the display of
PCB board, assemble the color
and shape of housing correctly
as follows:
Is the display of PCB shown in the sequence
of A-B-C?
Check the communi-
cation of PCB and
whether the LED 1
is continuously flick-
ering.
Are the power cord ((1) L, (2) N) and commu-
nication line (3) of outdoor terminal block con-
nected correctly?
Is the terminal of PCB terminal (RY71, 72, 73)
are assembled in the correct position?
Is the fuse open? (F701)
Is the fuse (F101, 250V 2 A) blown out?
Check whether the output voltage of IC01 (KA
7812) is DC 12V.
Check whether the output voltage of IC02 (KA
7805) is DC 5V.
Insert the primary side of power transformer
in the terminal GT01 and then is the voltage
of secondary side normal? (AC 15V- AC 25V)
Measurement of resistance of
power transformer
Are they as follows?
1st side 190 ~ 210½
2nd side 0.9 ~ 1.1½
BLK
WHT
BLK
RED
RED
WHT
Y Y
N
N
Y
Y
N
Y
N
Y
N N
Y
Y
Y
N
N
Y
N
N
3-2-2 No Power (Outdoor unit)
1) Inspection items
(1) Is the power source normal (the rating voltage ± 10% range)?
(2) Is the outdoor power connected normally? ((1) of terminal : L, (2) of terminal : N, (3) of terminal
: communication) ?
(3) Check whether the display of outdoor PCB(SEG1) is shown in the order of A- B - C when the
power is applied.
If the display (SEG 1) is not shown the inspection and repair shall be performed in the sequence
of the following:
2) Inspection sequence
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