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27Samsung Electronics

6-4 PCB Inspection Method

6-4-1 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 to 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.

6-4-2 Inspection Procedure

1. Check connector connection and peeling of PCB or bronze coating pattern before you think the PCB is broken.

2. The PCB is composed of the 3 parts.

• Main PCB Part : MICOM and surrounding circuit, relay, room fan motor driving circuit and control circuit, sensor driving circuit,

power circuit of DC12V and DC5V, and buzzer driving circuit

• Display part : LED lamp

• Switch part : Switch

6-4-3. Detailed Inspection Procedure

Plug out and pull the PCB

out of the electronic box.

Check the PCB fuse.

supply power.

If the standard lamp

twinkles at this time, the

above 1) ~ 3) have no

relation.

Press the OPER/STOP

button one time to enter

the TURBO mode.

But, exclude the

RESERVE operation.

Press the OPER/STOP

button one time to enter

the OPER mode.

1. Air Volume[High]

2. Continuous Operation

1) Is the fuse disconnected? (F701)

Checking the power voltage.

Is the BD71input voltage AC198V~AC242V?

2) Is the voltage between both terminals of the output

C104 on the 2

side of the transformer AC12V

±0.5V?

3) Is the voltage between both terminals of OUT and

GND of IC02(KA78L05) DC5V ±0.5V?

Checking the power voltage.

1) Check the voltage of the relay(RY71) coil(IC05 PIN

#10 and GND : OV, PIN#7 and GND : 5V) during

operation(3 minutes after TURBO operation).

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 ter-

minal #3 and #5 of the room fan motor

connector(CN73 and CN74)?

2) The room fan motor doesn't run.

3) The power voltage between terminal #3 and #5 of

the connector(CN73 and CN74) is 0V.

• Overcurrent

• Room Fan Motor Short

• ASS'Y Main PCB AC Pattern Short

• Poor Power Cord, Fuse Disconnection,

Wrong Power Cable Wiring, Poor AC Part

• Poor Switching Trans, Poor Power Circuit

• Poor Power Circuit, Load Short

• Relay(RY71) Coil Disconnection, Poor IC05

• Poor Relay(RY71) Contact

• Poor Room Fan Motor

• Poor Room Fan Motor Connector

(CN73 and 74) Contact

• Poor ASS'Y Main PCB

• Poor Connection

NO Procedure Inspection Method Cause

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Samsung SH09AI8V Specifiche Pagina 28

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