Sony XR-4750RDS Service Manual page 23

Pin No. Pin Name I/O
38 BEEP O
39 LCDCKO O
40 LCDSO O
41 LCDINH O
42 LCDCE O
43 UNICKO O
44 UNICKI I
45 UNISI I
46 UNISO O
47 VDD –
48 AVDD –
49 AVREF+ –
50, 51 I
KEYIN1,KEYIN0
52 D-BASS I
53 KEYSEL I
54 DSTSEL I
55 RC IN0 I
56 VSM1 I
57 VSM0 I
58 AVREF– –
59 AVSS –
60 GND –
61 BUSON O
62 SYSRST O
63 SEKOUT O
64 TUNON O
65 FM ON O
66 MUT O
67 AF SEK O
68 COLOR I
69 NOSESW I
70 ST IN I/O
71 SD IN I
72 REL T I
73-76 POS3-POS0 I
77 PW SEL I
78 TELMUTE I
79 TEST I
80 ILLIN I
Beep sound output pin
LCD clock output pin
LCD data output pin
LCD brank indication control pin
LCD chip enable output pin
Clock output pin (for SONY BUS) (C450RDS only)
Clock input pin (for SONY BUS) (C450RDS only)
Data input pin (for SONY BUS) (C450RDS only)
Data output pin (for SONY BUS) (C450RDS only)
Power supply
Power supply
A/D reference voltage input pin
Key input pin (A/D input)
D-BASS switch input pin (A/D input)
Key function setting pin (A/D input)
Destination setting pin (A/D input)
Rotary remote commander input pin (A/D input)
FM/AM multi-pass detection pin
FM/AM signal meter voltage detection pin (A/D input)
A/D reference voltage input pin
GND
GND
BUS ON control signai output pin (for SONY BUS) (C450RDS only)
System reset signal output pin (C450RDS only)
SEEK control signal output pin
Tuner power supply control pin
FM power supply control pin
System muting control pin At muting: "H"
AF seek control signal output pin
Illumination color setting pin "L": amber, "H": green
Front panel removal or attaching detection pin
Stereo detection signal input and forced monaural signal output pin
Station detection signal input pin
Reel table rotation detection pin
Tape position detection pin
Power select switch input pin
Telephone muting detection pin "L": 20 dB audio muting
Test mode setting pin
ILLIN signal detection pin
– 36 –
Function