Samsung MC26AC2X Service Manual download pdf (Page 28)

5-3Samsung Electronics

Troubleshooting

5-2-2 When the power is not applied(Outdoor unit)

1) Checklist :

(1) Is the voltage of the power normal? (The rating voltage ±10% range)

(2) Is the power line in good contact?

(3) Are the primary (CN71) and secondary (CN11) connectors of the power trans in

good contact?

(4) Is the power voltage of the IC01 (KA7812) normal? (DC11.5V~DC12.5V)

2) Troubleshooting procedure

Turn off the power, and then turn on the power

in five minutes.

Does the power of the IC01(KA7812) match with

the voltage of DC12V?

Is the F701(3.15A) fuse blown?

Is the secondary voltage of the trans normal?

(AC15V~AC25V)

Is the first voltage of the trans normal?

the rating voltage ±10% range

Is the rectifying diode(D101~D104) normal?

Is the IC01(KA7812) normal?

End

Normal operation

Replace the fuse

Replace the trans

Check and replace

the rectifying diode

Replace the C102

and C104.

Replace the IC01

Is the voltage at both ends of the C102

electrolytic condenser in the range of DC16~DC25V?

Is the voltage at both ends of the C104 electrolytic

condenser DC12V?

YES

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Samsung MC26AC2X Service Manual Page 28