Read Sony HCD-W55 / MHC-W55 / MHC-W77AV Service Manual online
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Pin No.
Pin name
I/O
Description
51
V
DD
–
Power supply. (+5V)
52
SPEC
I
Terminal for mechanism selection. (Ground connection)
53
DESTINATION
I
Terminal for model selection. (OPEN)
54
DISC SENS
I
Disc sensor input terminal.
55
RELAY
O
REC/PB head selector signal output.
56
A SHUT
I
Deck A reel detect.
57
B SHUT
I
Deck B reel detect.
58
B HALF SW
I
Deck B cassette detect.
59
A HALF SW
I
Deck A cassette detect.
60
A PLAY SW
I
Deck A play detect.
61
B PLAY SW
I
Deck B play detect.
62–64
KEY A–C
I
Key data input. (A/D converter input)
65, 66
NC
O
Not used. (OPEN)
67
POWER
O
Not used. (OPEN)
68
CD POWER
O
CD power switch output.
69
LED POWER
O
LED power switch output.
70, 71
NC
O
Not used. (OPEN)
72
NC
I
Not used. (OPEN)
73–79
NC
O
Not used. (OPEN)
80
A/B
O
Deck A/B selection output.
81
N/H
O
NORMAL/HIGH selection output.
82
BIAS
O
Bias ON/OFF selection output.
83
REC MUTE
O
REC mute ON/OFF selection output.
84
NR. ON/OFF
O
NR ON/OFF selection output.
85
REC/PB
O
REC/PB selection output.
86
PASS. AMP
O
Dolby pass signal output.
87
LINE MUTE
O
Line mute signal output.
88
CAPM. H/L
O
Capstan motor HIGH/LOW selection output.
89
A TRG
O
Trigger motor control output.
90
B TRG
O
Trigger motor control output.
91
TRG H/L
O
Trigger motor control output.
92
CAPM ON/OFF
O
Capstan motor ON/OFF output.
93
LED5
O
A-FWD LED drive.
94
LED6
O
CD PLAY LED drive.
95
LED7
O
CD PAUSE LED drive.
96
LED8
O
DISC3 LED drive.
97
LED9
O
DISC3 LED drive.
98
LED10
O
DISC2 LED drive.
99
LED11
O
DISC2 LED drive.
100
V
DD
–
Power supply. (+5V)
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