Music centre for spares or repair (Roebuck SG2)

Vintage music centre, Sharp Model SG-195E, for spares or repair. Radio, record player & cassette player. I think all three work ok but when the power is switched on it causes a RCD switch on our consumer unit to trip, so I presume the music centret must have a short circuit somewhere. It didn’t do this with our previous old-style fuseboard. Pair of 20W speakers included.