Samsung AQ18VBA, Service Manual

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Samsung Electronics
Troubleshooting
12-2-4 The Outdoor unit Fan error
1. Checklist :
1) Are the input power voltage and the power connection correct?
2) Is the motor wire connected to the outdoor PCB correctly?
3) Is there no assembly error or none-assembly in the terminal of motor wire connector?
4) Is there no obstacle at the surrounding of motor and propeller?
2. Troubleshooting procedure
Yes
Yes
Yes
No No
No
No
No
Yes
Yes
Is the Pin voltage of CN01
#1, #3 over 250V?
Follow the Check Procedure of
outdoor unit power supply error check.
FAN DRIVE CIRCUIT
(Q901,Q902 etc.) error
Exchange the PCB.
Exchange the PCB.
MICOM Error
Is the Pin voltage of CN01 #3, #5
within 1V~5V during the operation?
Does the Pin voltage of IC01(MICOM)
No.13 change?(Square-Wave)
Is the Pin voltage of CN01 #6 changed
during the operation?(Square-Wave)
Pull out the power cord and
execute the following step after 30 seconds.
Exchange the PCB.
Disassemble the BLDC FAN Wire.
Exchange the PCB.
Is the short between
the BLDC FAN Wires?
Exchange the BLDC FAN MOTOR.
12-5