Samsung SH09ZW8X Service Manual page 17

5-3 Breakdown diagnosis by symptoms
5-3-1 No Power (completely dead)-Initial diagnosis
1. Checklist :
1) Is input voltage normal?
2) Is AC power linked correctly?
3) Is input voltage of DC regulator IC KA7805 (IC02) normal? (11VDC-12.5VDC)
4) Is output voltage of DC regulator IC KA7805 (IC02) normal? (4.5VDC-5.5VDC)
2. Troubleshooting procedure
Unplug the power cord and plug it after 5 seconds
Press the Power Button on
the remote control unit to operate the air
Check the indoor unit control board
Check whether two wires
of power cord are connected correctly to the
terminal block and control board.
Check whether the fuse on the
control board is normal.
F701: 3.15[A]/250[V]
Check the output of
SMPS on the control board.
Input power: AC230±15%[V]
IC02 Input: DC 12[V]
IC02 output: DC 5[V]
Check the setting temperature
16
conditioner
does not operate
Yes
Yes
Yes
operate
Check the display board
No
Reconnect wires correctly
No
No
Replace the control board
Replace fuse
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