DIY Series 50: Panasonic Air Purifier (Unable to Power On)

Panasonic Air Purifier (F-VXT90) - Japan Model (100V Supply Model)

It was told that the Panasonic Air Purifier (F-VXT90) was malfunction, unable to power on. The owner wanted to scrap it but I managed to fix it with just merely US$0.50.

Photos (PCB Debug & Repair):

1. Power Module PCB was taken out to check the malfunction parts
2. Burnt parts identified (T3.15A Radial Fuse & Varistor 07D221K)
3. Desoldered the broken parts
4. Broken parts (Zoom In): Visual inspection and open/short test using multimeter
5. Replace new parts (T3.15A Radial Fuse & Varistor 10D221K)

Photos (Suitable Parts Study & Sourcing):

1. Function of Varistor (Circuit Protection)
2. Comparison of Varistor 07D221K vs 10D221K (to check on compatibility for replacement)
3. Sourcing for radial fuse (T3.15A, 250V)
4. Sourcing for varistor (use 10D221K to replace 07D221K, due to part unavailable from local market)

Photos (Dismantling of Air Purifier Unit):

1. Lying down the unit, open the front cover
2. Remove the filters (3 parts) from the unit
3. Unscrew the screw at the left and right (upper side)
4. Unscrew the screw at the left and right (lower side)
5. Unscrew 6 screws at the base to remove the roller base plate
6. Remove the roller base plate
7. Unscrew the center screw to remove the PCB Cover (upper side)
8. Remove the Front Cover
9. Unscrew to remove the Infrared PCB
10. Remove connector on Wifi Module PCB (with MAC Address)
11. Remove the 2nd layer PCB Cover
12. Unscrew the 1st screw on Power Module PCB
13. Unscrew the 2nd screw on Power Module PCB
14. Disconnect all cable connectors, dismantle the Power Module PCB

Tools required:

1. Screw driver
2. Multimeter
3. Soldering iron

Cost involved:

1. Radial Fuse (10 units): US$0.40
2. Varistor (1 unit): US$0.10