I've an air purifier (AP) 3M Filtrete FAP03-RS, work in 220v AC.
But I found the fan is moving very slow these days.
Even, I already shift the control speed's knob to maximum.
It unable to take the air, pass to filter then blow out the air.
The flow was very weak or no winds blows.
I already put some oil into the motor but doesn't improve anything.
then I read some sources on internet says about run/start capacitor.
I found box shape cap, with value 2.5 microFarad, 440v.
Beside above cap, there are two PCBs, I think both use for controlling the fan speed and LED indicator.
In the PCBs, there are two ICs, two non-polar caps (box shape, yellow), two pollar caps, resistor, etc.
I don't know whether the cap was run-cap or start-cap. So, I do some experiments as follow:
FYI, I've multitester with me (only support ohm, ampere, AC/DC).
According to above experiment, could someone help me to identify the problem. My question are:
But I found the fan is moving very slow these days.
Even, I already shift the control speed's knob to maximum.
It unable to take the air, pass to filter then blow out the air.
The flow was very weak or no winds blows.
I already put some oil into the motor but doesn't improve anything.
then I read some sources on internet says about run/start capacitor.
I found box shape cap, with value 2.5 microFarad, 440v.
Beside above cap, there are two PCBs, I think both use for controlling the fan speed and LED indicator.
In the PCBs, there are two ICs, two non-polar caps (box shape, yellow), two pollar caps, resistor, etc.
I don't know whether the cap was run-cap or start-cap. So, I do some experiments as follow:
- I turn on the AP, the motor spin but very weak, then I twist the fan using hand as much as I can. The fan spin faster but only hold for few seconds just because I twisted it. After some seconds the fan slow down and reach the same slow constant speed.
- I'm removing the cable attach to the cap, and just connect the cable together (bypass the cap). Turn on the AP, and found the motor not moving at all. I try to twist it manually using hand, as fast as possible. but seems the motor wont start. The fan just spin then slow down until stop by itself.
- I put again the cable into the cap. turn on the AP. the motor start as before with very slow speed.
- Then, I check another component, something like speed sensor near the motor. I remove this sensor by cutting the cable. Note, the capacitor is still installed. Surprisingly, the motor now spin faster and I can feel the winds is blowing. I'm happy but still not satisfied. Because I'm feeling the motor was not spin at maximum speed.
- If I connect again the sensor, the motor again spin very slow.
- Removing both the cap and the sensor also wont make the motor spinning.
FYI, I've multitester with me (only support ohm, ampere, AC/DC).
According to above experiment, could someone help me to identify the problem. My question are:
- what is the capacitor's type in this AP? is it start-cap or run-cap?
- is it possible the sensor create problem? how to test this component is fail or not using multitester?
- is it possible to turn on the motor by bypassing the PCBs? the motor has 4 wires (red, black, green, blue)
- is it possible to check the motor coil whether in good condition or not?