1) Checklist :
(1) Is input voltage normal? the rating voltage ±10% range.
(2) Is AC power linked correctly?
(3) Are connections between primary side, secondary side of the power transformer and PCB good.
(4) Is input voltage of DC regulator IC KA7805 (IC02) normal? (11VDC-12.5VDC)
(5) Is output voltage of DC regulator IC KA7805 (IC02) normal? (4.5VDC-5.5VDC)
2) Troubleshooting procedure
Fault Diagnosis by Symptom
2
◆ No Power (completely dead)-Initial diagnosis
Troubleshooting
114
Unplug the power cord and
plug it after 5 seconds
Press the on/off switch
located in indoor unit to
operate the air conditioner
Check whether two wires
of power cord are
connected correctly to the
terminal block.
Check whether the fuse on the control
board is normal.
F701: 3.15[A]/250[V]
F702: 1[A]/250[V]
Check the output of SMPS
on the control board.
Input power: AC23015%[V]
IC02 Input: DC 12[V]
IC02 output: DC 5[V]
◆
Check the setting temperature
◆
Check the indoor unit
control board
◆
Check the remocon and indoor
unit display board
Reconnect wires correctly
Replace fuse
Replace the control board
operate
does not operate
OK
OK
OK
NOT OK
NOT OK
NOT OK
00150A(2)-100-139* 2/5/01 12:01 PM Page 114
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