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Yamaha m70 amp and c70 pre-amp right speaker stopped working

I have a yamaha m70 amp and c70 pre-amp that was working fine now my right speaker will not work on either a or b speaker channel

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First, lets's determine if it's the amp or the preamp...

Swap the Left and Right channel cables between preamp and the amp with each other.

Did it stay on the right? = amp problem.

Now on the left? Preamp or source.

Plug any Line Level device (CD?) directly into the amp inputs. Work now? Preamp problem.

ALL sources? Preamp - toggle all controls, especially a Tape Monitor to possibly wipe of any built-up oxides in them.

Posted on May 31, 2010

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