Samsung AD26B1C13 Service Manual page 14

3-3-3 No Power (Outdoor unit)
1) Inspection items
(1) Á 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
communication of
YES
Normal of
PCB and whether
outdoor PCB
the LED 1 is contin-
uously flickering.
Replace the
transformer
Replace the fuse
(F701) 250V 3.15A.
Measurement of resistance
NO
of power transformer
Are they as follows?
1st side 190 ~ 210Ω
2nd side 0.9 ~ 1.1Ω
YES
Assemble the transformer
in the normal way.
Check the
YES
NO
communication line (3) of outdoor terminal
Is the terminal of PCB terminal (RY71, 72, 73)
YES
Insert the primary side of power transformer
NO
in the terminal GT01 and then is the voltage
of secondary side normal? (AC 15V- AC 25V)
Replace the outdoor unit Ass'y main PCB.
Put the power off and put it on after
5 seconds.
Is the display of PCB shown in the
sequence of A-B-C?
NO
Are the power cord ((1) L, (2) N) and
block connected correctly?
YES
are assembled in the correct position?
YES
Is the fuse open? (F701)
NO
YES
Is the fuse (F101, 250V 2 A) blown out?
NO
Check whether the output voltage of
IC01 (KA 7812) is DC 12V.
YES
Check whether the output voltage of
IC02 (KA 7805) is DC 5V.
YES
Reinstall the power cord and
NO
communication line with the
reference of installation manual.
After watching the display of
NO
PCB board, assemble the
color and shape of housing
correctly as follows:
BLK
BLK
WHT
WHT
RED
RED
YES
Replace the fuse F101
(250V 2 A).
Check and Replace the rectifying
NO
diode of power side
(D101 - D104) and KA 7812.
NO
Replace the IC 02 (KA7805)
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