Samsung MC26AC2X Service Manual download pdf (Page 30)

Samsung Electronics 5-5

Troubleshooting

5-2-4 When the Outdoor Unit Does Not Operate. (Initial Diagnosis)

1) Checklist :

(1) Is input voltage normal? (The rating voltage ±10% range)

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

mode?

(3) Is the POWER IN connector (terminal-tab) linked correctly?

(4) Is the outdoor unit properly connected with the TERMINAL BLOCK connector(5P)?

2) Troubleshooting procedure

(1) Checking procedures for the indoor unit.

After unplugging out the power cord should be

reconnected within five seconds.

Does the operating lamp blink

YES

NO !

YES #

YES

! NO

@ NO

A Room operation

“A”Compreessor or outdoor fan-motor replaced

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.

YES #

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?

1) Is the rating voltage ±10% range applied relay between

Terminal Tap(TB71) and RY 71 terminal No #

2) Is the rating voltage ±10% range applied relay between

Terminal Tap(TB71) andCN 71 terminal No !

B Room or C Room operating

Proceed to the checking points for the outdoor unit.

Test rod location Normal

+ - Condition Voltage

IC1 Pin No.63 GND RY73 ON DC 4.8V

IC1 Pin No.62 GND RY72 ON DC 4.8V

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

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Samsung MC26AC2X Service Manual Page 30

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