Samsung AS09A5MA Service Manual page 14

3-2-3 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
Does the timer lamp blink during operation ?
Is the power relay RY71 operated by adjusting the room
Test rod location
+
IC4 Pin No.62 GND
Is rating voltage ±10% range applied relay between Terminal block
12
YES
NO
3
temperature?
Normal
- Condition Voltage
RY71 ON DC 4.8V
NO
NO(N1) and No. 1
YES
Is the room sensor normal register?
10°C
17.96k Ω
NO
YES 1
NO
Power relay is
out of order
1
NO
YES
2
20°C 30°C
12.09k Ω 8.3k Ω
YES
3
Check as in the procedure "No Power parts"
Refer to page 5-2.
Room temperature sensor is
out of order
2
PCB should be checked.
Microcomputer is
out of order.
PCB should be
checked.
Power relay should be
replaced.
Outdoor unit is
out of order.