Sony CFD-S22 Service Manual page 56

Pin No. Pin Name
75 NC
76 A-MUTE
77 SCL
78 EC
79 TC-PLAY
80 C-DOOR
I/O
— Not used. (Open)
O Audio mute output H: Mute
O EEPROM clock output
I Event counter input
I Tape play switch input L: Tape
I CD door open/close switch input L: Close
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Pin Description