1999 GMC Sierra 1500 Pickup Owner's Manual - Page 178

Comfort Contrors & Audio Systems Care of Your Cassette Tape PIayer A tapeplayerthatisnotcleanedregularlycancausereducedsoundquality, ruinedcassettes, or adamagedmechanism.Cassettetapesshouldbestored in theircasesawayfromcontaminants,directsunlight,andextremeheat. theyaren't,theymaynotoperateproperlyorcausefailureofthetapeplayer. If or after 15 hours of Your tapeplayershouldbecleanedregularlyeachmonth use.Ifyounoticeareduction in soundquality,tryaknowngoodcassette to is atfault. If thisothercassettehas no see if thetapeortheplayer improvementinsoundquality,cleanthetapeplayer. Cleanyourtapeplayerwithawiping-action,nonabrasivecleaningcassette, it. andfollowthedirectionsprovidedwith Cassettesaresubjecttowearandthesoundqualitymaydegradeovertime. Alwaysmakesurethatthecassettetapeisingoodconditionbeforeyou haveyourtapeplayerserviced. K1313 Fixed Mast Antenna Thefixed mastantennacanwithstandmostcarwasheswithoutbeing damaged. If themastshouldeverbecomeslightlybent,youcanstraighten out by hand. If themast is badlybent,as it mightbebyvandals,you replace it. Checkeveryonce fender. in a while to be sure the mast it should is still tightened to the 3-1 8