Pcb Inspection Method; Pre-Inspection Notices; Inspection Procedure; Indoor Detailed Inspection Procedure - Samsung AQV09A Series Service Manual

4-4 PCB Inspection Method

4-4-1 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 (C103) after 30 seconds power off.

4-4-2 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 the 3 parts.
1. Indoor Main PCB Part : MICOM and surrounding circuit, relay, room fan motor driving circuit and control circuit, sensor driving
1. Display part : LED lamp, Switch, Remocon module
1. Outdoor Main PCB part : MICOM and surrounding circuit. IPM and PFC circuit and control circuit.
1. EMI PCB Part : Line filter and Noise Capacitor, Varistor

4-4-3 Indoor Detailed Inspection Procedure

No Procedure
1
Plug out and pull the PCB
out of the electronic box.
Check the PCB fuse.
2
Supply power.
If the operating lamp
twinkles at this time,
the above 1)~3) have
no relation.
3 Press the ON/OFF button.
4 Press the ON/OFF button.
1. FAN Speed [High]
2. Continuous Operation
4-24
circuit, power circuit of DC12V and DC5V, and buzzer driving circuit.
Inspection Method
1) Is the fuse disconnected?
Checking the power voltage.
1) Is the DB71 input voltage AC200V~AC240V?
2) Is the voltage between both terminals of the
C104 on the 2 side of the transformer DC12V
nd
±0.5V?
3) Is the voltage between both terminals of OUT
and GND of IC19(KA78L05) DC5V ±0.5V?
Checking the power voltage.
1) Is the voltage over AC180V being imposed on
1) terminal #3 and #5 of the fan motor
connector(CN72)?
2) Check the voltage of both terminals of
terminal block 1 and N(1) after 3 minute
operation.: AC220V
1) Is the voltage over AC180V being imposed on
1) terminal #3 and #5 of the fan motor
connector(CN72)?
2) The fan motor of the indoor unit doesn't run.
3) The power voltage between terminal #3 and #5
of the connector(CN72) is 0V.
Cause
• Over current
•
Indoor Fan Motor Short
•
AC Part Pattern Short of the MAIN PCB
• Power Cord is fault, Fuse open. Wrong Power
Cable Wiring, AC Part is faulty.
•
Switching Trans or Power Circuit is faulty
• Power Circuit is faulty, Load Short
•
Relay(RY71) Coil Disconnection, IC05 is faulty
•
Relay(RY71) Contact is faulty
•
Fan Motor of the indoor is faulty
•
Fan Motor Connector(CN72) is faulty
•
ASS'Y Main PCB is faulty
• Connection is faulty
Samsung Electronics