Samsung UQ07*5ME, Service Manual, Page: 31 / 72

Troubleshooting
Samsung Electronics 5-4
5-2-3 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
YES
YES
NO
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.
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
17.96k
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(N1) and No. 1
Test rod location Normal
+ - Condition Voltage
IC4 Pin No.33 GND RY71 ON DC 4.8V
#
!
!
@
#
@
NO
YES
DB81-00181A(4)-1 3/6/11 3:24 PM Page 5-4