Samsung SC07AS2, Service Manual

Page: 23 / 46

Troubleshooting
Samsung Electronics 22
6-2-5 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 set temperature of the remote control lower than room temperature in HEAT mode?
4) Is the POWER IN connector (CN71) linked correctly?
5) Is the outdoor unit properly connected with the TERMINAL BLOCK connector(N(1), 1, 2, 3)?
2. Troubleshooting procedure
After unplugging out the power cord should be
reconnected within 5 seconds.
Does the OPERATION lamp blink
Yes
No
Yes
No
No
No
Yes
Yes
Outdoor unit is
out of order.
Power relay is
out of order
Power relay should be
replaced.
PCB should be
checked.
Micom is
out of order.
Sensor Should be
replaced
Room temperature sensor is
out of order
Check as in the procedure "No Power"
Is the room sensor normal resistor?
10°C 20°C 30°C
17.96k
Ω
12.09k
Ω
8.3k
Ω
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. N(1) and No. 1
Test rod location
Normal
+ - Condition
Voltage
IC4 Pin No.38 GND RY71 ON DC 4.8V
#
!
!
@
#
@
No
Yes
DB98_16999A(2)_1 04/3/12 10:27 AM Page 22