Samsung AC009BNLDCH Service Manual page 278

Troubleshooting
Others (Cont.)
2) In case of do not operate 3 Booster Fan (all Fan)
Action method : horizontally or intermediate or swing set up.
Type ①: Booster Fan Wire 1 (Yellow Wire), 3 (Black Wire) pin voltage :
When it is less than DC12V, replace the PCB.
Type ②: If type ① is not defective, Booster Fan Wire 4 (Blue Wire), 3 (Black Wire) pin voltage :
When it is more than 2.7V, replace the PCB.
Type ③: If type ② is not defective, Booster Fan Wire 2 (White Wire), 3 (Black Wire) pin voltage :
When it is approximately 5V, replace the PCB.
4-84
PIN No.1: VCC (YELLOW/+)
4 3 2 1 4 3 2 1
PIN No.2: SIGNAL (WHITE)
PIN No.3: GROUND (BLACK/-)
PIN No.4: PWM (BLUE)
PIN No.1: VCC (YELLOW/+)
4 3 2 1 4 3 2 1
PIN No.2: SIGNAL (WHITE)
PIN No.3: GROUND (BLACK/-)
PIN No.4: PWM (BLUE)
PIN No.1: VCC (YELLOW/+)
4 3 2 1 4 3 2 1
PIN No.2: SIGNAL (WHITE)
PIN No.3: GROUND (BLACK/-)
PIN No.4: PWM (BLUE)
Samsung Electronics