Samsung UQ07A1AE, Service Manual

Page: 29 / 47

5-4
Samsung Electronics
5-2-3 When the Outdoor Unit Does Not Operate. (Initial Diagnosis)
1 ) Checklist :
(1) Is input voltage normal?(rating voltage
±
10% range)
(2) Is the set temperature of the remote control higher than room temperature in COOL m o d e ?
(3) Is the set temperature of the remote control lower than room temperature in HEAT mode?
(4) Is the POWER IN connector (terminal-tab and POWER RELAY) linked corre c t l y ?
(5) Is the outdoor unit properly connected with the TERMINAL BLOCK connector
( T E R M I N A L #1 and #3)?
2 ) Troubleshooting pro c e d u re
Troubleshooting
After unplugging out the power cord should be recon-
nected within five seconds.
Does the operating lamp blink
YES
YES
NO
NO
NO 1
YES 3
2
NO
YES
1 NO
2 NO
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.
YES 3
Is the room sensor normal register?
(25°C
→
10k
Ω
)
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 the rating voltage ± 10% range applied relay between Terminal
Tap(TB71) and RY 71 terminal No. 3
Test rod location Normal
+ - Condition Voltage
IC04 Pin #57 GND RY71 ON DC 4.8V