Sony RDR-GX315 Service Manual page 66

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No audio on line input mode
Check select signal of
pin5, 14, 2, 15 in IC203
(jack board)
Yes
Check pin16 of IC203,pin2
of CN101 in jack board
Yes
Check all the vcc of
IC502, IC504
(Jack board)
Yes
Check passive components
around jack-pin and IC203
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No
check pin9, 10 (input select)of IC203
No
Check SMPS board
No
Replace Jack PCB
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