– 22 –
Pin No. Pin Name I/O Function
44 SCK I Serial data reading clock signal input from the system controller (IC501) (for SONY bus)
45 SI I Serial data input from the SONY bus interface (IC571)
46 SO O Serial data output to the SONY bus interface (IC571)
47 VDD — Power supply terminal (+5V)
48 AVDD — Power supply terminal (+5V) (for A/D converter)
49 VREF I Reference voltage input terminal (+5V) (for A/D converter)
50 to 52 NIL I Not used (fixed at “L”)
53 MUTE-SEL I Setting terminal for the muting selection (fixed at “L”)
54 DIST-SEL1 I Destination setting terminal (fixed at “L”)
55 DIST-SEL0 I Destination setting terminal (fixed at “L”)
56 S-METER (AM) I AM signal meter voltage detection input from the FM/AM tuner unit (TU10)
57 S-METER (FM) I FM signal meter voltage detection input from the FM/AM tuner unit (TU10)
58 to 60 NIL I Not used (fixed at “L”)
61 MODE2 O Tuner system power supply on/off control signal output to the BA3918 (IC601) “H”: tuner on
62 NCO O Not used (open)
63 RECEIVE O Seek control signal output to the FM/AM tuner unit (TU10)
64 BST-ON O Bass-boost control signal output to the power amplifier (IC701) “H”: bass-boost on
65 MODE1 O FM system power supply on/off control signal output to the BA3918 (IC601) “H”: FM on
66 TUNER-MUTE O FM and AM signal muting on/off control output “H”: muting on
67 AF-SEEK O AF seek control signal output terminal Not used (pull down)
68 NCO O Not used (open)
69 — I Not used (fixed at “H”)
70 ST-IN/MONO I/O
71 SD-IN I
Station detector detect input from the FM/AM tuner unit (TU10)
Stop level for SEEK, BTM, etc. is determined SD is present at input of “H”
72 NCO O Not used (open)
73 FWD/REV O
Forward/reverse direction control signal output to the CXA2510AQ (IC210)
“H: reverse direction, “L”: forward direction
74 AMSON O
Tape auto music sensor control signal output to the CXA2510AQ (IC210)
“L” is output to lower the gain for audio level at FF/REW
75 to 80 NCO O Not used (open)
Input of FM stereo detection signal from FM/AM tuner unit (TU10), and output of forced
monaural control signal to FM/AM tuner unit (TU10) (Commonly used for stereo display input
and forced monaural output)
FM stereo detection at input of “L”, forced monaural at output of “L”
*1 loading/tape operation motor control
MODE
TERMINAL
LMLOD (pin #∞) “L” “H” “L” “H”
LMEJ (pin #¢) “L” “L” “H” “H”
STOP
LOADING/
FORWARD
EJECT/
REVERSE
BRAKE
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