Samsung MC26AC2X Service Manual download pdf (Page 41)

Troubleshooting

Samsung Electronics5-16

5-3-3 Detailed Procedure

No.

Malfunction

Pull out the power plug from

the AC terminal and confirm

the fuse on the PCB assembly

Turn the power on.

Set the TURBO mode

Checking point (symptoms)

1. Is the broken(open)?

Voltage check

1. AC voltage at BD71(~,~)?

: rating voltage ± 10% range

2. DC voltage at BD71(+,-)?

: about 325[v] ± 10%

3. DC voltage at IC02

: IN-GND

➔

DC12[v]

: OUT-GND

➔

DC5[v]

4. Voltage waveform at Q201

: collector-GND

➔

squarewave

Voltage check

1. check voltage of IC06

(pin#10,pin#8)

: relay on

➔

0.7[v]

: relay off

➔

12[v]

2. Voltage at terminal block

((N1) -1)

➔

rating voltage

Causes

Voltage over

Indoor unit fan

motor short-circuit

SMPS circuit is faulty

PC02, R202-R205

SMPS circuit is faulty

IC06 is faulty

RY71 is faulty

∆

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Samsung MC26AC2X Service Manual Page 41

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