Read Sony TC-TX77 / TC-TX770 Service Manual online
– 12 –
Pin No.
Pin Name
I/O
Function
47
P14
O
48
P13
O
49
P12
O
50
P11
O
51
P10
O
52
P9
O
53
P7
O
Segment signal output to fluorescent indicator tube (FLT851)
54
P6
O
55
P5
O
56
P4
O
57
P3
O
58
P2
O
59
P1
O
60
G5
O
61
G4
O
62
G3
O
Grid Signal output to fluorescent indicator tube (FLT851)
63
G2
O
64
G1
O
65
TYPE 1
O
Tape type output
“H”: Normal position
66
TYPE 2
O
Tape type output
“H”: High position
67
TYPE 4
O
Tape type output
“H”: Metal position
68
—
—
69
—
—
Not used (Fixed at “L”)
70
—
—
71
SOLENOID
O
Plunger (PM901) drive output
“H”: On
72
CAPSTAN
O
Capstan/reel motor (M902) drive output
“H”: On
73
Vcc
—
Power supply (+5 V)
74
Vee
—
Ground
75
AVss
—
Ground for A/D converter
76
Vref
I
Reference voltage (+5 V) for A/D converter
77
HALF
I
Cassette half detection input from S905
78
AMS IN
I
AMS input
79
LIMIT SW
I
Loading detection input from S901
Open: “L”, Close: “M”, COM: “H”
80
PULSE
I
Rotary detection input from PH901
Voltage
Input port
0 V
0.45 V
1.19 V
2.19 V
3.2 V
3.98 V
4.48 V
5.0 V
Pin 4, KEY-X
Open/Close
STOP
PAUSE
FWD
REV
CD
—
Not key input
§
p
P
·
ª
SYNC
Pin 3, KEY-Y
POWER
REW
FF
REC
RESET
DIRECTION DOLBY NR Not key input
ON/OFF
0
)
r
*
1 Key Input
*
2 Loading Motor (M901)
IN
OUT
BRAKE
CLOSE !£
H
L
H
OPEN !¢
L
H
H
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