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SHARP FAN PJS400: SLOWING DOWN OR NOT ABLE TO TURNING

Common issue with the fan slowing down or working was to the dust and grease started drying. And sometimes due to the damaged capacitor due to its age. Rarely due to the winding damage.
Figure 1: Sharp PJS400 fan
In the sharp PJS400 fan case, my friend as me to look and fix it for him.


Inside Cover of Sharp PJS400?

Look what is inside after opening the back cover?

Figure 2: Inside the back cover of fan. Too many dust




Looks like the fan has not been clean for ages.


Why Important to Clean Fan?

Dust usually will caused more resistant to the rotation of fan rotor. This is due the dust entering
the bearing and mix with grease.

Therefore, it is important to have proper maintenance interval or cleaning the blade, front case and back of the fan at regular interval.. Cleaned Fan will have less friction to rotate, less resistance, thus, less energy to rotate and help reduce energy usage...although, it is not as significant.


Extra note about capacitor:

Usually, after some period of time, capacitor of the fan might not able to store enough electrical charge anymore in order to fan to rotate at optimum level. So, it is good practice to always have spare capacitor at your home just in case your to replace the capacitor of your fan.

Whenever service or cleaning work is carry out, we can always check the condition of capacitor or just use common sense. Usually capacitor will not ok after 2-3 years of maximum usage. If yours is already passed 3 years, it is good to replace it. Cost of capacitor is quite cheap, at about RM4-RM6..

When changing capacitor, always take note of old capacitor specification. The value that need to be note is capacitance value in microFarads [uF] and Voltage [V]. Capacitance value should be close to equal to original value, such, you can pick 1.5uF from 1.4uF. Too big value of capacitance will damaged your fans winding.

For Voltage value, you can pick between 400V to 450V..that is the common value for all capacitor.


Cleaning and Greasing?

Back to the sharp fan, internal part is cleaned and greased as on the picture below. In my case, Toyo grease was used. All rotational part is sprayed.

Figure 3: Cleaning, Greasing the internal part including the bearing


Figure 4: Spray grease


For this sharp PJS400, capacitor is still working find...the only problem is, it need cleaning and re-greasing to smooth things out. Both front and back bearing is grease, and cleaned before that.


Figure 5: After cleaning

Figure 6: After cleaning and greasing.

Outcome?:


Once done, can be observe that, speed of the fan increase dramatically. Clean blade also help increase the rotation speed.

Figure 7: Fan after clean and greasing

Thank you for reading this. Hope this help anyone with the same problem

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