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3-2 Fault Diagnosis by Symptom
3-2-1 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 ÒtingÓ 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
Is the operation lamp of
Y
indoor unit on when the
No trouble
operation /stop button of
(normal)
remote controller is
N
Is the communication sig-
Check of remote
nal of remote controller
controller
surely sent and received ?
Is there no problem
Y
between the connector
Normal
of AssÕy display PCB and
the receiving module?
Replace of Ass'y display
8
Y
Is the operation lamp flickering with the
pressed?
N
Is the outdoor power connected normally?
Y
Is the fuse (F701, 250V, 3.15A) of PCB open?
N
Is the voltage at Socondery side of transformer
PCB
Is the output voltage of voltage regulator IC
Is the output voltage of electrostatic voltage
regulator IC (KA 7805) DC 4.5 V - 5.5 V?
Replace the main PCB of indoor unit
Apply the power
sound of ÒtingÓ?
N
Y
N
of PCB (TN71)? (AC15V~AC25V)
Y
(KA 7812) DC 10V and 12V?
Y
Y
N
Check of the installation method and
electrical circuit
Y
Replace the fuse (250V, 3.15 A).
N
Transformer is out of order - replace
Repair and replace the power source
N
rectifying diode (D101- D105) and
KA7812.
N
KA7805 is out of order - replace
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