Mars DVH Series - Page 38

Service Manual - DVH 09/12/18/24 SF Series
Service Manual - DVH 09/12/18/24 SF Series
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Index 1:
1: Indoor or Outdoor DC Fan Motor(control chip is in fan motor)
Power on. When the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor
connector. If the value of the voltage is not in the range showing in below table, the PCB has
problems and should be replaced.
DC motor voltage input and output(voltage: 220-240V~)
NO. Color Signal Voltage
1 Red Vs/Vm 280V~380V
2 --- --- ---
3 Black GND 0V
4 White Vcc 14-17.5V
5
Yellow
Vsp
0~5.6V
6 Blue FG 14-17.5V
DC motor voltage input and output(voltage :115V~)
NO. Color Signal Voltage
1 Red Vs/Vm 140V~190V
2 --- --- ---
3 Black GND 0V
4 White Vcc 14-17.5V
5
Yellow
Vsp
0~5.6V
6 Blue FG 14-17.5V
2. Outdoor DC Fan Motor (control chip is in outdoor PCB)
Power on ,and check if the fan runs normally; if the fan runs normally, the PCB has problems
and should be replaced, If the fan can’t run normally, measure the resistance of each two pins. If
the resistance is not equal to each other, the fan motor has problems and should be replaced,
otherwise the PCB has problems and should be replaced.
3. Indoor AC Fan Motor
Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds,
measure the voltage of pin1 and pin2. If the value of the voltage is less than 100V(208~240V
power supply)or 50V(115V power supply), the PCB has problems and should be replaced.