Samsung AC052HBLDKH Service Manual page 60

4-6-3 Indoor Detailed Inspection Procedure
No Procedure
Open the electronic
component box and
1
check the PCB fuse
Check the LEDs for
DC power and communi-
cation condition
2
Check the DIP and rotary
3
switch on the PCB
Check the DC voltage
4
FAN operation checking
Press the ON/OFF button.
5
1. FAN Speed[HIGH]
2. FAN mode
4-26
Inspection Method
Turn off the power
1) Is the Fuse F701 on the EMI PCB blown?
2) Is the Fuse F702 on the MAIN PCB blown?
Turn on the power
1) Is RED LED blinking?
1) his led means micom is running normally.
2) Is GREEN LED blinking?
1) This means communication between Indoor and
Outdoor unit is on
3) Is YELLOW LED blinking?
1) This means communication between Indoor and
wired remote controller is on.
1) It may take one minute to start communication
1) Is the setting of each switch proper?
1) Is the voltage of CN32 pin #1-#2 12V?
2) Is the voltage of C109 V?
1) Is the FAN motor running?
2) Is the connection of CN73 normal?
Cause
Over current
Indoor fan motor short
PCB AC Part pattern short
Communication ciucuit trouble
Communication wire connection trouble
wrong connection for power supply wire of
remote controller
Wrong setting of switch
SMPS on MAIN PBA trouble
Load short
Controller trouble inside of the fan motor
connector trouble of CN73
Samsung Electronics