Sony SLV-M20HF - Video Cassette Recorder, Service Manual

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5-3
5-6. SERVO/SYSTEM CONTROL MICROPROCESSOR PIN FUNCTIONS
(MA-335 BOARD IC161)
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Pin Name
RF SWP
AF REC P
N.C.
QVD
AUTO PRESET
FE ON
REC CTL
CTL RESET
CAM 2
N.C.
TA MUTE
S-VHS
NT JUDGE
MESECAM DET
CIN (REC PRF)
AV CONT
SECAM ON
SW1
MODE 4
MODE 3
MODE 2
MODE 1
POWER SAVE
CONT 1
POWER SAVE
C+
MOD CONT
TV/VTR
N.C.
SDA 0
N.C.
SCL 0
A MUTE
T/E LED
N.C.
N.C.
CAP STOP
FULL ERS
N.C.
N.C.
MP
ASURA RESET
VSS
XTAL
EXTAL
ASURA CS
S IN 0
S OUT 0
SCLK
NICOL ON
CBC POWER
F. MONO
I/O
O
O
—
O
O
O
O
O
I
—
O
I
I
I
I
O
—
—
I
I
I
I
O
O
O
O
—
I/O
—
I/O
O
O
—
—
O
O
—
—
I
I
—
O
I
I
I
O
I
O
O
O
Function
RF switching pulse output.
“H” when HiFi audio REC.
Not used.
Quasi VD pulse output.
“H” during auto preset.
Flying erase ON/OFF
REC CTL signal output.
Capstan current control. “H” during
slow mode.
Cam motor control.
Not used.
Tuner audio mute. H: Mute
S-VHS tape detection signal in.
Not used.
Not used.
Erasing protection tab, cassette in
detection signal input.
Not used.
Not used.
Not used.
Cam encoder signal input.
Cam encoder signal input.
Cam encoder signal input.
Cam encoder signal input.
Not used.
Not used.
Not used.
TV/VTR control signal output.
Not used.
I 2 C data.
Not used.
I
2
C clock.
“H” when audio mute.
Tape top/end sensors driver.
Not used.
Not used.
Capstan stop signal output.
Full erase control.
Not used.
Not used.
Fixed to “L”.
System reset signal.
Ground.
System clock 16MHz.
System clock 16MHz.
Servo/system control microcomputer
chip select signal.
Serial communication signal.
Serial communication signal.
Serial communication signal.
NICOL control signal out.
Cable box control signal out.
Forced mono.
Pin No.
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
Pin Name
SW2
AVSS
AVREF
AVDD
NTPB SW
AV ADJ
FOLLOW TV
N.C.
AF ENV
RF ENV
T SENS
S SENS
S REEL FG
T REEL FG
N.C.
VSYNC
PB CTL
DRM PG
DRM FG
CAP FG
BLUE BACK
ON
CAP RVS
CAP DA
DRM DA
N.C.
N.C.
REC COUNT
C PLUS DET
N.C.
DATA (SSB)
CLOCK (SSB)
N.C.
N.C.
CAP TRQ PWM
N.C.
N.C.
N.C.
VSS
VDD
5V
N.C.
CTL HYS HIGH
N.C.
N.C.
N.C.
AF REC
N.C.
N.C.
STEP PLS
AF SWP
I/O
O
—
—
—
I
I
I
—
I
I
I
I
I
I
—
I
I
I
I
I
O
O
O
O
—
—
I
O
—
O
O
—
—
O
—
—
—
—
—
—
—
O
—
—
—
O
—
—
O
O
Function
Not used.
Unswitched ground.
AD port reference input UNSW 5V.
UNSW 5V.
Not used.
Adjustment mode.
Not used.
Not used.
HiFi audio playback signal envelope.
Video playback signal envelope.
Take-up end sensor.
Supply end sensor.
Supply reel FG input.
Take-up reel FG input.
Not used.
Composite sync. signal input.
Playback CTL input.
Drum PG input.
Drum FG input.
Capstan FG input.
Not used.
Capstan reverse control “H” when
reverse.
Capstan error D/A output.
Drum PG output.
Not used.
Not used.
Counter signal input when recording.
Not used.
Not used.
Serial communication data.
Serial communication clock.
Not used.
Not used.
PWM output for capstan torque
control.
Not used.
Not used.
Not used.
Ground.
5V.
5V.
Not used.
CTL amp gain control.
Not used.
Not used.
Not used.
“H” output when hifi audio recording.
Not used.
Not used.
Step pulse “H” when capstan step
driving.
AF switching pulse output.