Samsung MC26AC2X Service Manual download pdf (Page 32)

5-7Samsung Electronics

Troubleshooting

5-2-5 When the Outdoor Unit Does Not Operate. (Initial Diagnosis)

1) Checklist :

(1) Is input voltage normal?

(2) Is the set temperature of the remote control higher than room temperature in COOL

mode?

(3) Is the POWER IN connector (CN71) linked correctly?

(4) Is the outdoor unit properly connected with the TERMINAL BLOCK connector((N1), 1)?

2) Troubleshooting procedure

After unplugging out the power cord should be

reconnected within five seconds.

Does the STD lamp blink

YES

Outdoor unit is

out of order.

Power relay is

out of order

Power relay should be

replaced.

PCB should be

checked.

Microcomputer is

out of order.

PCB should be checked.

Room temperature sensor is

out of order

Check as in the procedure "No Power parts"

Refer to page 5-2.

Is the room sensor normal register?

10°C 20°C 30°C

17.96kΩ 12.09kΩ 8.3kΩ

Does the timer lamp blink during operation ?

Is the power relay RY71 operated by adjusting the room

temperature?

Is rating voltage ±10% range applied relay between Terminal block

NO(N1) and No !

Test rod location Normal

+ - Condition Voltage

IC4 Pin No.33 GND RY71 ON DC 4.8V

YES

DB98_11868A(1)_1 3/3/03 11:17 AM Page 4-5

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Samsung MC26AC2X Service Manual Page 32