Read Sony XR-C750 Service Manual online
– 28 –
Pin No.
Pin Name
I/O
Pin Description
49
SUBCE
O
Sub volume serial chip enable output
50
VOLCKO
O
Electric volume serial clock output
51
SUBCKO
O
Sub volume serial clock output
52
VOLSO
O
Electric volume serial data output
53
TAPMUT
O
Tape mute control output
54
DOLON
I/O
DOLBY control input/output
55
DOLBC
I/O
DOLBY B/C select control input/output
56
AMSIN
I
Music with/without detection input in AMS.
57
DIMMER
I/O
Dimmer control input/output
58
AD ON
O
Power control output for A/D conversion.
59
TIRIND
O
TIR indicator control output (Not used.)
60
RESET
I
Reset input
61
SIRCS
I
Remote commander input
62
BU IN
I
Back-up power detection input
63
DOORSW
I
Door open/close switch
64
ACCIN
I
Accessory power detection input
65
NOSESW
I
Detachable panel detection
66
TELMUT
I
Telephone mute detection input
67
KEYACK
I
Key input acknowledge
68
VDD
—
Power supply for microcomputer.
69
X OUT
O
Main ceramic oscillator output pin (5 MHz)
70
X IN
I
Main ceramic oscillator input pin (5 MHz)
71
GND
—
GND for microcomputer.
72
XT OUT
O
Sub crystal oscillator output pin (32.768 kHz)
73
XT IN
I
Sub crystal oscillator input pin (32.768 kHz)
74
AVDD
—
Power supply for A/D conversion.
75
AVREF
—
Reference power supply for A/D conversion.
76, 77
KEYIN0, 1
I
Key input 0, 1
78, 79
KEYSEL0, 1
I
Key function select setting input
80
NIL
I
Connect to GND.
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