Sony Walkman WM-FX855, Service Manual

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Pin No. Pin Name I/O Function
47 BEEP O Output of beep sound (f=1.6 kHz)
48 HOLDER I Input of cassette cover open/close switch “ L ”: Close, “ H ”: Open
49 NC — Not used for this set (Open)
50 WAKE UP I Input of interrupt signal for STOP mode cancel
51 NC — Not used for this set (Open)
52 DDC (TC) CTL O Output of DC-DC converter ON/OFF control signal “ L ”: ON
53 MUTE CTL O Output of audio MUTE control signal “ L ”: MUTE ON
54 TC DATA O Output of communication data to µPD17073
55 TC CLK O Output of communication clock to µ PD17073
56 NC — Not used for this set (Open)
57 AVSS — Ground terminal (A/D converter)
58 NC — Not used for this set (Open)
59 AVR I Input of A/D converter reference voltage
60 F/R SW I Input of mechanism deck mode switch (A/D input) “ L ”: FWD, VDD/2: REV
61 KEY IN I Key input terminal (A/D input)
62-64 NC — Not used for this set (Open)