Linn Intek problem

Hi, everybody. I have a problem with my intek. I actually got it from a friend of mine and I connected to my speaker but no sound comes out. instead of sound just comes bang when I turn off amp. so I was trying again and again then sound came out for short while then again went away. I opened the cover look inside very carefully and it look very clean. does anyone have ideas for this problem? and how can I fix it. I can't do it my self and I already contacted linn but they are not going to fix it(because it is too old... What ever...). Please help me out... Thanks in advance.