Samsung MC26AC2X Service Manual download pdf (Page 37)

Troubleshooting

Samsung Electronics5-12

5-2-10 When the SV-B is malfunctioning

1) Checklist :

(1) Is the SV-B under normal operating condition?

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

(3) Is the SV-B connector (CN75) in good contact?

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

2) Checking procedures

Turn off the outdoor power, and then turn it on

after 5 seconds

Does the SVA operate when the room B among the indoor

unit room B and room C is turned on?

Does the photo-coupler (IC02) for the room B among the

indoor unit room B and room C operate?

Is the voltage of about DC5V or above applied to

both ends of the C905?

Is the voltage of about DC6V or above applied to

both ends of the C901?

! Is the 14th pin output of the IC04 maintained at

"High" level?

@ Is the Ist pin output of the IC04 maintained at

"Low" level?

Are the Q906, Q907, and Q909 under turn on condition,

and is the Q908 under "turn off" condition?

Is the Q703 turned. on, indicating the

operating of the SV-B relay (RY73)?

Normal operation

Check and replace the photo coupler (IC02)

• Check and replace the R929 and R930

• Check and replace the C905

• Check and replace the R901, R928 and D908

• Check and replace the C901

! Is the voltage of the 12th pin

for the IC04 about DC7V?

@ Is the voltage of the 3rd pin

of the IC04 about DC5V?

•Check and

replace the IC04

•Check and

replace the

resistance(R902,

R903,R905,R906)

Check and replace the relevant transistor

Check and replace the D905, D909, and Q703 relay

(Coil resistance at both ends of the relay:about 400Ω)

Replace the SV-B solenoid valve

YES

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Samsung MC26AC2X Service Manual Page 37

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