Pcb Inspection Method; Indoor Detailed Inspection Procedure - Samsung AR09FSSYAWTNEU Service Manual

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
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
No Procedure
Plug out and pull the
1 PCB out of the contol box
Check the PCB fuse
Supply power
If the opera ng lamp twinkles
2
at this me, the above 1)~3)
have no rela on
Press the ON/OFF bu on
3 1. Fan speed(high)
2. Con nuous Opera on
New Function [ Indoor Terminal Block Safety Device ]
1.Thermal Fuse is installed in Terminal Block as below.
(Thermal Fuse is used to prevent PL caused by a defective connection of indoor and
outdoor units)
2. Thermal Fuse is opened when internal temperature of Terminal Block goes to a certain point
due to Tracking caused by a defective connection of indoor and outdoor units.
- When Thermal Fuse is opened, Main PBA (DC12V) is turned off and the indoor unit does
not operate. (There is no problem with Main PBA in this case)
- In the above case, the change of all-in-one Terminal Block will make Main PBA operate again.
3. Measurement method of fair/defective thermal fuse
Inspec on Method
1) Is 1st fuse disconnected?
2) Is 2nd fuse disconnected?
Check the power viltage
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 fan motor
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
<Ter m i nal Bl ock I nt er nal s>
Fai r ( SH O RT)
fan motor sensing and driving circuit, temperature sensing circ
circuit. Communication circuit
sensing and driving circuit, compressor driving circuit
ontrol circuit, 4way circuit, communication circuit,
temperature sensing circuit)
Over current
Indoor Fan motor short
AC part and pa ern 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 inddor is faulty.
Fan motor connector(CN72) is faulty
PBA is faulty
<C onnnect i on of t er m i nal bl ock and M ai n PBA>
C i r cui t Bl ock
D ef ect i ve(O PEN)
uit
Cause
1 2-3