Service manual

17
3. When the Outdoor Unit Does Not Operate - Initial Diagnosis
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 the Cool mode?
(3) Is the POWER IN connector (CN71) linked correctly?
(4) Is the outdoor unit properly connected with the terminal block connector?
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
NO
YES
YES
Outdoor unit is
abnormal.
Power relay
is abnormal.
Replace the
Power relay
Check PCB
Micom is
abnormal.
Check PCB
Room temperature sensor is
abnormal.
Check as the procedure "No Power"
Refer to page 14
Is the room sensor registered normal?
50°F(10°C) 68°F(20°C) 86°F(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 voltage rating within ±10% range applied relay
between the terminal block?
3
1
1
2
3
2
NO
YES
Test rod location
+
#33(IC04)
-
GND
Condition
RY71 ON
Normal
Voltage
DC 4.8V
3-1 US07A5(6)MA / US09A5(6)MAF
AS07AS(6)MA SM_E_15774 2/12/04 9:19 PM Page 17