Samsung MC26AC2X Service Manual download pdf (Page 35)

Troubleshooting

Samsung Electronics5-10

5-2-9 When the SV-BY is Malfunctioning (Outdoor Unit)

1) Checklist :

(1) Is the SV1 under normal operating condition?

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

(3) Is the connector (CN76) of the SV-BY in good contact?

(4) Is the resistance at both ends of the solenoid about 1.4kΩ ?

2) Checking procedures

(1) When either of the indoor units (B & C) is turned on

Turn off the outdoor power, and then turn

on the power in 5 seconds.

Does the SV-BY operate when either of the

indoor units is turned on?

Is the voltage of DC6V applied to both ends

of the C901?

(1) Does the No14 pin output of the IC04

maintain "High"?

(2) Does the No1 pin output of the IC04

maintain "Low"?

Is the No8 pin output of the IC04 in "High"

condition?

Are the Q906, and Q907 in "turn-on" condition?

Is the Q908 in "turn-off" condition?

Does the operation of the Q702 lead to

activation of the SV-BY relay (RY72)?

Replace the SV-BY

Normal

• Check and replace the relevant IC (IC02, IC03).

• Check and replace the resistance (R901, R928, R931),

and diode (D907, D908).

(1) Is the No12 pin voltage

of the IC04 DC7V?

(2) Is the No3 pin voltage

of the IC04 DC5V?

• Check and replace the IC04.

• Check and replace the

resistance

(R902, R903, R905, R906).

Check and replace each transistor

• Check and replace the IC04.

• Check and replace the

resistance (R922, R924).

Check and replace the Q702 and relay.

(Resistance at both ends of the relay: 400Ω )

Is the No10 pin voltage

of the IC04 DC7V?

YES

NO NO

YES

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Samsung MC26AC2X Service Manual Page 35

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