12-29
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 a er 1 minute power off
1. Check connector connec on and peeling of PCB or bronze coa ng pa ern 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. Communica
on 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, communica
on circuit,
OPTION (EEV control circuit, temperature sensing circuit)
No procedure Inspec on 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 pa
ern short of Indoor PBA
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 betwee
n 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
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) T
he power voltage between terminal #3-
#5 of the connector(CN72) is 0V
. PBA is faulty
Supply power
If the opera
ng lamp
twinkles at this
me , the
above 1)~3) have no
rela
on
2
3
Press the ON/OFF bu
on
1. Fan speed(high)
2. Con
nuous Opera on
To Next Page
Loading...
Need help?
General
