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.
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| Check the |
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Normal of |
| YES | communication of | YES | Is the display of PCB shown in the | |||||
outdoor PCB |
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| PCB and whether |
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| the LED 1 is contin- |
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| Are the power cord ((1) L, (2) N) and | ||||
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| communication line (3) of outdoor terminal | ||||
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| block connected correctly? | ||||
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| YES |
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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 | ||
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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.
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| NO | Insert the primary side of power transformer | |||
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| in the terminal GT01 and then is the voltage | |
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| of secondary side normal? (AC 15V- AC 25V) | |
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| YES |
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| Is the fuse (F101, 250V 2 A) blown out? | |
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| NO |
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| Check whether the output voltage of | |
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| IC01 (KA 7812) is DC 12V. | |
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| YES |
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| Check whether the output voltage of | |
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| IC02 (KA 7805) is DC 5V. | |
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| YES |
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| Replace the outdoor unit Ass'y main PCB. | |
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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)
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