Mark Levinson No 38, Need Help

Dear All, I need help for my preamp no 38

My preamp works perfect for all input from RCA ( even from phono )
can anybody here help me, how to active balance input connection
/ xlr interconnect from preamp input channel 1 or 2 ?

Is there specific way to active them ?

i try several times from channel 1 or 2 ( From DAC and CD player )
but channel 1 and 2 in preamp still " NO INPUT " in the LCD

Thank you in advance, Best regards


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