Quote:
Originally Posted by stewartrose
Good Morning Michael,
Well following the oscillator circuit I have found ether broken/corrosive ic socket terminals, so If I can get an other board eg 067.235 then I will remove all IC Sockets and clean the board, and put new ic sockets back in..
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Just a word re long term preventative maintenance.
I'm guessing the probable cause of the corrosion, or a strong contributor, is dust falling on the top surface of the PCB over a long period, which is made worse by any exposed metal parts or pcb tracks. This applies to the A700 main control pcb as well. I'd always give a good clean to the top sides of both PCB's and then repair any corrosion to tracks etc. Especially for anyone who owns a large collection of machines, covering up the upward facing ventilation holes of the machine when not in use seems a no brainer.