3-3-2 When the power voltage is not available
1)Inspection items
(1)Is the power voltage is normal? (The rating voltage ±10% range)
(2)Is the power cord is correctly connected and is the contact good?
(3)Does the sound “ting” come out with the operation lamp (green) flickering when the power is applied?
If it is not flickering, do inspect and repair in accordance with the following inspection sequence.
2)Inspection sequence
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| Apply the power | ||
| YES | Is the operation lamp of |
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No trouble | indoor unit on when the | Is the operation lamp flickering with the | ||||||||||
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(normal) |
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| operation /stop button of |
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| sound of “ting”? | |||
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| remote controller is |
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| pressed? |
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| NO | ||
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| NO |
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Check of remote
controller
Normal
Is the communication
NO
signal of remote
controller surely sent
and received ?
| YES | |
YES | Is there no problem | |
between the connector of | ||
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| Ass’y display PCB and the | |
| receiving module? | |
| NO | |
| Replace of | |
| Ass'y display PCB |
NO
Is the outdoor power connected normally?
YES
YES
Is the fuse (F701, 250V, 3.15A) of PCB open?
NO |
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Is the voltage at Socondary side of transformer | NO |
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of PCB (TN71)? (AC15V~AC25V) |
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YES |
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Check of the installation
method and electrical circuit
Replace the fuse (250V, 3.15 A)
Transformer is out of
order - replace
Is the output voltage of voltage regulator
IC (KA 7812) DC 10V and 12V?
YES
Is the output voltage of electrostatic voltage
regulator IC (KA 7805) DC 4.5 V - 5.5 V?
YES
NO
NO
Repair and replace the power source rectifying diode (D101- D105) and KA7812.
KA7805 is out of order - replace
Replace the main PCB of indoor unit
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