Repair or maintenance of compact disc players, repair or maintenance of record players, repair or maintenance of magnetic tapes players, repair or maintenance of magnetic tapes recorders, repair or maintenance of mini disc players, repair or maintenance of mini disc recorders, repair or maintenance of digital versatile disc players, repair or maintenance of digital versatile disc recorders, repair or maintenance of audio mixers, repair or maintenance of IC recorders, repair or maintenance of tuners, repair or maintenance of amplifiers, repair or maintenance of headphones, repair or maintenance of hard disk network players, repair or maintenance of surround receivers, repair or maintenance of AM/FM stereo receivers, repair or maintenance of loudspeakers, repair or maintenance of personal stereos, repair or maintenance of radios for vehicles, repair or maintenance of navigation apparatus for vehicles, repair or maintenance of compact disc players for vehicles, repair or maintenance of magnetic tapes players for vehicles, repair or maintenance of mini disc players for vehicles, repair or maintenance of amplifiers for vehicles, repair or maintenance of radiotelegraphy sets, repair or maintenance of portable telephones, repair or maintenance of television apparatus, repair or maintenance of walkie-talkies, repair or maintenance of cabinets for loudspeakers, repair or maintenance of computer monitors and computer hardware, repair or maintenance of projectors, repair or maintenance of CCD cameras