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

Put the power off and put it on after

5 seconds.

 

 

 

Check the

 

 

 

 

 

 

Normal of

 

YES

communication of

YES

Is the display of PCB shown in the

outdoor PCB

 

 

PCB and whether

 

sequence of A-B-C?

 

 

 

 

 

 

the LED 1 is contin-

 

 

 

 

 

 

 

 

 

uously flickering.

 

 

 

 

 

NO

 

 

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Are the power cord ((1) L, (2) N) and

 

 

 

 

 

 

communication line (3) of outdoor terminal

 

 

 

 

 

 

block connected correctly?

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is the terminal of PCB terminal (RY71, 72, 73)

Replace theare assembled in the correct position? transformer

YES

Replace the fuse

YES

Is the fuse open? (F701)

(F701) 250V 3.15A.

NO

 

NO

NO

Reinstall the power cord and communication line with the reference of installation manual.

After watching the display of PCB board, assemble the color and shape of housing correctly as follows:

BLK BLK

WHT

WHT

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.

 

 

NO

Insert the primary side of power transformer

 

 

 

 

 

in the terminal GT01 and then is the voltage

 

 

 

 

 

 

 

 

 

 

of secondary side normal? (AC 15V- AC 25V)

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace the outdoor unit Ass'y main PCB.

 

 

 

 

 

 

 

YES

NO

NO

RED RED

Replace the fuse F101

(250V 2 A).

Check and Replace the rectifying

diode of power side

(D101 - D104) and KA 7812.

Replace the IC 02 (KA7805)

13

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Samsung AD18B1C09, UD26B1C2, UD18B1C2, AD26B1C13 service manual No Power Outdoor unit, Is the display of PCB shown
Page 13 Page 15

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