| Common key structure type metal spring sheet and conductive rubber 1 repair of conductive rubber fault. Such failures are often due to the conductive coating rubber button for a long time according to the wear caused by, resulting in increase of the resistance of conductive coating, usually due to surface contamination dust or conductive coating shedding. First use of anhydrous alcohol cleaning, if not, then the blade coating gently scraping a thin layer, or with a pencil (containing high carbon) the keys and a circuit board contact side repeated friction, carbon coated button above, increase conductivity. Still unable to recover when had to replace. If not to buy suitable, homemade alternatives: find the foil of a cigarette box, remove the foil surface of a thin layer of paper, cut and had the same shape, then on the foil surface and the original conductive rubber coated with a layer of adhesive, to be dry, the foil stickers on the conductive rubber, after compaction can be used. 2 metal spring plate type key fault repair. Such failures are often caused by corrosion, deformation, breakage or dust on the surface of the metal sheet. Corrosion, James Gray, first will be corroded part with a blade and gently scrape, by using anhydrous alcohol cleaning wipe clean can, such as severe corrosion of the best replacement; leaf spring deformation tweezers available its plastic, restitution, if you have lost a good elasticity, best replacement; spring clips cracked, only replaced. Key metal spring piece can be made, a considerable thickness, good elasticity of brass sheet, cut and the original shape of the same size, welding, welding, be sure to the electric iron plug, waste heat for welding to prevent electrostatic damage to the circuit board of the integrated block. Fault of conductive coating on 3 circuit board. Wear the conductive coating on the circuit board, with the several ways are generally not very good repair, even if shear block and line contact with the same shape of sheet metal, the conductive lines on the circuit board is fine, cut into the metal plate easy to be deformed and cannot be well fixed, although temporarily can use, not be long before the fault will emerge. Here is a good way to be able to quickly repair the. Will be a waste of No. 1 dry battery cracked and remove the carbon, scrape out a carbon, fine files in carbon rods file from a certain amount of toner, the more detailed the better, general a contact only a bean size amount can be. Then toner and amount of carpentry with white latex (or all-purpose adhesive, but it is better to use white latex convenient operation) mixture, stir into a paste, trumpet horologe or toothpick dip from the edge of the coating to the circuit board electrically conductive lines, action to be fast, prevent the first coating is dry and hard, can't and behind the good bonding, coating to carefully, try to do not with the adjacent line connected. The paste to be carbon paste slightly dry hands, flatten by hand, screwdriver plastic, such as accidentally two short circuit until the toner is dry with a blade will be connected to gently scrape off can be used. |