Samsung AD26B1C13 Service Manual page 16

3-3-5 When the outdoor unit fan does not operate
1) Inspection items
(1) The outdoor unit fan motor operates only when the operating conditions are satisfied and is selected
by the RY74(LOW) and PY75(HI) to rotate.
(2) Is the power voltage normal?
(3) Is the contact of outdoor unit fan motor (CN 73) good?
(4) Is the winding resistance of outdoor unit fan motor 58Ω at Hi side and 143Ω at low side?
(5) The outdoor unit fan motor operates with Hi at over 28°C and low at below 26°C during the cooling
operation, and operates with Hi at below 14°C and low at over 15°C during the heating operation.
2) Inspection sequence
Apply the power to the outdoor unit and operate the indoor unit.
Is the indoor unit under operating conditions?
Is it operating in the High speed?
Is the voltage shown across the connector (1)↔(3) ((1)↔(5))
(the rating voltage ±10% range)?
Is no. 11 ( 12) of IC 06 at low? (DC 0.7 V)
Is pin no. 48(49) of IC 04 (MICOM) at High (DC 5 V)?
Is the outdoor unit fan motor under the operating
* Operating specification of the FAN of outdoor unit
(1) When the COMP is under the COMP ON condition during the cooling and heating operation,
Hi or LOW operation is selected according to the temperature condition of outdoor room.
(2) When A room and B room are mixed to operate , it is always under low operation.
(3) Perform the comp ON/OFF control in the dry mode.
(4) When it is under the operation of anti-freezing, overload protection, defrost operation, it may
be Low, high or Off.
(5) Hi = High speed, Low = Low speed
YES
NO
NO
NO
NO
conditions?
NO
Normal
NO
Normal (operation off)
YES
YES
Check the winding resistance of outdoor unit fan
motor winding resistance → Replace
YES
Contact bad of RY 74(Low), RY 75(High)
YES
Defect of IC06 output
YES
Defect of IC 04(MICOM) - replace the IC 04
or PCB ass'y
Normal
→ Replace
→ Replace
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