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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
Apply the power
Is the operation lamp of
indoor unit on when the
operation /stop button of
remote controller is
pressed?
Is the communication
signal of remote
controller surely sent
and received ?
Is there no problem
between the connector of
Ass’y display PCB and the
receiving module?
Replace of
Ass'y display PCB
Is the fuse (F701, 250V, 3.15A) of PCB open?
Is the voltage at Socondary side of transformer
of PCB (TN71)? (AC15V~AC25V)
Is the output voltage of voltage regulator
IC (KA 7812) DC 10V and 12V?
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
Repair and replace the power
source rectifying diode (D101-
D105) and KA7812.
KA7805 is out of order - replace
Transformer is out of
order - replace
Replace the fuse (250V, 3.15 A)
Is the outdoor power connected normally?
Check of the installation
method and electrical circuit
No trouble
(normal)
Check of remote
controller
Normal
Is the operation lamp flickering with the
sound of “ting”?
YES
NO
NO
YES
YES
NO
NO
YES
NO
YES
YES
YES
NO
NO
NO
YES
NO
YES
DB98_05645A(1)_1 5/30/02 7:04 PM Page 12