Samsung Electronics 11-3
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, f
an 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, f
an 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 Inspection Method Cause
1
Plug out and pull the PCB
out of the control box
Check the PCB fuse
1) Is 1st fuse disconnected?
2) Is 2nd fuse disconnected?
. Over current
. Indoor Fan motor short
.AC part and pattern
short of
Indoor
PBA
2
Supply power
If the operating lamp twin-
kles at this time , the above
1)~3) have no relation
Check the power voltage
1) Is the BD71 input voltage
200Vac~240Vac?
.Power cord is f
ault, Fuse open,
Wrong Power cable Wiring,
AC part is faulty
2) Is the voltage between both ter-
minal of IC02 pin #1-#2 12Vdc?
. Switching Trans of Power circuit
is faulty
3) Is the voltage between
both ter-
minal of IC02 pin #
2-#3 5Vdc?
. Power circuit is faulty, Load short
3
Press the ON/OFF button
1. Fan speed(high)
2. Continuous Operation
1) Is the voltage over AC 180V being
imposed on terminal #3-#5 of fan
motor connector (CN72)?
. Fan motor of the indoor is faulty
2)
The fan motor of the indoor unit
doesn't run
. Fan motor connector(CN72) is
faulty
3) The power voltage between
terminal #3-#5 of the
connector(CN72) is 0V
. PBA is faulty
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