Samsung MH18AP1(P2)-09, Руководство по обслуживанию, Страница: 44 / 82

Troubleshooting
43 Samsung Electronics
6-3-3 No Power (Outdoor unit)
1. Checklist :
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 (SEG1) is not shown the inspection and repair shall be performed in the sequence of the following:
2. Troubleshooting procedure
No
No
Replace the fuse
(F701) 250V 3.15A.
Replace the
transformer
Assemble the transformer
in the normal way.
Replace the outdoor unit Ass'y main PCB.
Reinstall the power cord and
communication line with the reference
of installation manual.
Replace the fuse F101 (250V 2A).
Replace the IC02 (KA7805)
Check and Replace the rectifying
diode of power side (D101-D104)
and KA7812.
After watching the display of PCB
board, assemble the color and shape
of housing correctly as follows:
Is the fuse open? (F701)
Is the fuse (F101, 250V 2A) blown out?
Check whether the output voltage of IC01
(KA7812) is DC 12V.
Check whether the output voltage of IC02
(KA7805) 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 ~ 210
Ω
2nd side 0.9 ~ 1.1
Ω
BLK
BLK
RED
RED
WHT
Yes Yes
No
No
Yes
Yes
No
Yes
No
Yes
Yes
Yes
No No
Yes
Yes
No
No
Put the power off and put it on
after 5 seconds.
Is the display of PCB shown in the
sequence of A-B-C?
Normal of
outdoor PCB
Is the terminal of PCB terminal (RY71, 72,
73) are assembled in the correct position?
Are the power cord ((1) L, (2) N) and
communication line (3) of outdoor terminal
block connected correctly?
Check the commu-
nication of PCB
and whether the
LED 1 is continu-
ously flickering.
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