These things are pretty well made for the money, but they can only take so much (drum) stick.
Due to the vibrations caused as you belt away to 'Hey Joe', mechanical failure is almost inevitable......which is good news as it probably means the reason for your set up failing is just a detached wire or a broken joint somewhere.
Also, if you move your drum kit around a lot, the connecting wires, plugs and sockets can become damaged.
This guide though deals with the possible repair of an individual faulty cymbal unit .....you can easily decide whether the cymbal itself is faulty by swapping the cymbal plugs around. If the fault 'follows' the cymbal, then the problem is with that instrument or it's connecting wire.
These instructions are for the Wii kit, but may be applicable to others.
Tools required: Medium crosspoint screwdriver, soldering iron and solder.
Step 1: Remove cymbal
Simply a matter of unplugging the cymbal, loosening the coloured nut on top and lifting the cymbal off.
Put the wedge shaped collar from under the nut somewhere safe!