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i got a siemens 505-7012 analog card 8in/4out in one of our machine.for last few days i am having some problem with it.when i am starting the machine after a long break the card functions well after 5 minutes the output from one channel ceases. i have also noticed that the card is getting heated. i have done a cold check for all the components but found ok. can any body help me in repairing it.