Pcb Inspection Method; Pre-Inspection Notices; Inspection Procedure; Indoor Detailed Inspection Procedure - Samsung AR09KSWSPWKNCV Service Manual

10-3 PCB Inspection Method

10-3-1

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.
10-3-2

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)
10-3-3

Indoor detailed inspection procedure

No procedure
Plug out and pull the
1 PCB out of the control
box Check the PCB fuse.
Supply power
If the operating lamp
2 twinkles 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
terminal of C111(+)-(-) 12Vdc?
3) Is the voltage between both
terminal of C118(+)-(-) 5Vdc?
1) Is the voltage over DC 270V being
imposed on terminal #1~#3 of
fanmotor connector(CN72)?
2) The fan motor of the indoor unit
doesn't run.
3) The power voltage between
terminal #1-#3 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.
10-