The Beolink 1000 will not work with a Beomaster 3000 as it uses older codes. You can use a Beomaster terminal (for the Beomaster 6000) and Beolab terminal (Beomaster 8000), they send the same codes as the 3000 remote.
Beocenter 9300, Beogam CD50, Beocord 5500, Beomaster 3400, Beomaster 4400, 2 Beogram 4000, Beomaster 8000, 2 beogram 8002, Beovox S-75, Beovox MS150.2, Beovox RL6000, Beovox S-35, Beomaster 6000, 2 Beocord 9000, Beocord 8004, Beocord 5000, Form 1, 2x Beolink 1000, Beo4, MX3500, LS4500. Born 1993.