Vintage Synth Repair

Dear Ed and list ,
if the contact strip is one long piece of plastic , then on certain
Yamaha models you have to put the strip in the right way round , there
is a red mark at one end .But I can't remember if that's the top or
bottom .
when I last ordered one for a repair Yamaha didn't tell me this in
advance .its worth gently wiping of the contact pcb's as well as dust
can cause problems .

hope this helps , regards Peter 
South London England