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SAMSUNG ELECTRONICS
10-2-1 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 rst the complete discharge of condenser after 1 minute power off
10-2-2 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)
10-2-3 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 twinkles 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 fault, Fuse open, Wrong Power
cable Wiring, AC part is faulty
2) Is the voltage between both
terminal of IC02 pin #1-#2
12Vdc?
. Switching Trans of Power circuit is faulty
3) Is the voltage between both
terminal 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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