Samsung MC26AC2X Service Manual download pdf (Page 38)

Samsung Electronics

Troubleshooting

5-13

5-2-11 When the SV-C is malfunctioning

1) Checklist :

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

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

(3) Is the SV-C connector (CN74) 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 SVB operate when the room C among the indoor

unit room B and room C is turned on?

Does the photo-coupier (IC03) for the room C among the

indoor unit rooms B and room C operate?

Is the voltage of about DC5V or above applied to both

ends of the C906?

Is the voltage of about DC6V or above applied to both

ends of the C901?

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

maintained a "Hight" level?

@ Is the output of the lst pin of the I04 maintained

at "Low" level?

Are the Q906, Q907 and Q909 turned on with the Q908

being turned off?

Is the Q704 turned on, indicating the operating condition

of the SV-C relay (RY74)?

Normal operation

Check and replace the photo coupler(IC03)

• Check and replace the R932, and R933

• Check and replace the C906

• Check and replace the R901, R931, and D907

• Check and replace the C901

! Is the voltage of the 12th pin

of the IC04 about DC7V?

@ Is the voltage of the 3rd pin

of the IC04 about DC5V?

• Check the

IC04

• Check and

replace the

resistance

(R902, R903,

R905, R906)

Check and replace the relevant transistor

Check and replace the D906, D910, and Q704 relay

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

Replace the SV-C solenoid valve

YES

DB98_11868A(1)_1 3/3/03 11:17 AM Page 5-3

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Samsung MC26AC2X Service Manual Page 38

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