Samsung AR18HSFNBWKNEU Service Manual page 122

11-2-1 Pre-inspection Notices
1. Check if you pulled out the AC power plug when you eliminate the PCB or front panel
2. Don't hold the PCB side not impose excessive force on it to eliminate the PCB
3. Don't pull the lead wire but hold the whole housing to connect or disconnect a connector to the PCB
4. In case of outdoor PCB disassembly, check first the complete discharge of condenser after 1 minute power off
11-2-2 Inspection procedure
1. Check connector connection and peeling of PCB or bronze coating pattern when you think the PCB is broken
2. The PCB is composed of 3 parts
Indoor Main part : MICOM and surrounding circuit, relay, fan motor sensing and driving circuit, temperature sensing circuit power
circuit of SMPS, buzzer circuit. Communication circuit
Display part : LED lamp, Switch, Remote-control module
Outdoor Main part : MICOM and surround circuit, fan motor sensing and driving circuit, compressor driving circuit power
circuit of SMPS, PFC control circuit, 4way circuit, communication circuit, OPTION (EEV control circuit, temperature sensing circuit)
11-2-3 Indoor detailed inspection procedure
No Procedure
Plug out and pull the PCB
1
out of the control box
Check the PCB fuse
Supply power
If the operating lamp twin-
2
kles at this time , the above
1)~3) have no relation
Press the ON/OFF button
3
1. Fan speed(high)
2. Continuous Operation
Samsung Electronics
Inspection Method
1) Is 1st fuse disconnected?
2) Is 2nd fuse disconnected?
Check the power voltage
1) Is the BD71 input voltage
200Vac~240Vac?
2) Is the voltage between both ter-
minal of IC02 pin #1-#2 12Vdc?
3) Is the voltage between both ter-
minal of IC02 pin #2-#3 5Vdc?
1) Is the voltage over AC 180V being
imposed on terminal #3-#5 of fan
motor connector (CN72)?
2) The fan motor of the indoor unit
doesn't run
3) The power voltage between
terminal #3-#5 of the
connector(CN72) is 0V
Cause
. Over current
. Indoor Fan motor short
. AC part and pattern short of
Indoor PBA
. Power cord is fault, Fuse open,
Wrong Power cable Wiring,
AC part is faulty
. Switching Trans of Power circuit
is faulty
. Power circuit is faulty, Load short
. Fan motor of the indoor is faulty
. Fan motor connector(CN72) is
faulty
. PBA is faulty
11-3