I was given an Aiwa Z-R700 from the 1990s era to look at by someone who said the twin tape deck did not work. The whole unit unit powered up ok but there was nothing from the tape deck. I had a look and found all the belts broken, I replaced the belts and then put the tape deck back into place and it still does not work. Also when I now power up the unit all the lighting on the front is very dim and the cd player and the tuner as well as the tape deck do not work. I have checked all the connections and ribbon cables again, there are no burnt or swollen capacitors. Maybe there are capacitors on...