kiwi_craig's blog View Details
Archive for September, 2018
Posted by kiwi_craig | Sep 14, 2018 @ 03:40 PM | 8,519 Views
Okay there are allot of complaints that the XK k120 min board has electrical reliability problems, and yes at times there are burn outs of tail motor plugs and the like. In my opinion most of the problems stem from fact the main board and the esc are hard linked, and the the main board cantilevers out past the the main chassis plate, any nose in "landing" results in direct impact to the main board and leveraging of the rigid links to the esc, this results in cracking of the board tracks and a dead board. Most off the time the factory sponge foam, whilst stuck to the chassis still has the protective paper in place on the board side so the board isn't actually fixed, it is solely flexing away on the two mounting screws.

the fix is simple, remove the board and esc unit, cut the hard esc links between the main board and the esc with side cutters

remove the black spacer blocks and further trim the links down close to each board.

Solder on flexible wires, I used plugs in between mine for ease of installation.

Mount the main board on double sided sponge foam and position just above mounting screws, do not use the screws, all they do is transfer vibration into the board.

use double side sponge foam tape and fix the ESC to the under side of the main chassis plate

connect your new wires - plugs

You will now have a way more reliable set-up.

On mine I extended the main chassis plate so it is longer than the main board, any nose on impact is now absorbed by the chassis rather than the main board.

https://www.rcgroups.com/forums/show...anggood/page78

been reliable and lots of flights and crashes without issue. Also seems that there is better power flow with cooler running servos and reduced motor temps are well. Winning all round and no down side.