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SC-540 shuts down after startup

Taff_Beer

New Member
Hi all,
I have an SC-540 that turns off within 10 seconds of starting up, will stay on standby all day but shuts down once sec power is pressed, I can access the service menu but only for 10 seconds, I have replaced the main board, panel board and ribbon cable, encoder strip and the problem is still there, I don't get any error codes it just powers off, head carriage moves freely, any suggestions because i am at a loss,
thanks
 
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