IC PIN FUNCTION
IC501 ( SERVO / SYSTEM CONTROL IC )
"H"
≥
4.5V, "L"
≤
1.0V
Pin
No.
IN/
OUT
Signal
Name
Function
Active
Level
1
IN
REMO
CON-IN
Remote Control
Sensor
L
2
OUT
TV/VCR
RF Conv. ON/OFF
Signal (TV="L"/
VCR="H")
H/L
3
–
N.U.
Not Used
–
4
–
N.U.
Not Used
–
5
–
N.U.
Not Used
–
6
–
N.U.
Not Used
–
7
OUT
INSEL/
ST-SL
Input Selector
Control Signal
(EE/Rec)/
Still/Slow (Playback)
H/Hi-z
/L
8
OUT
HiFi-CS
HiFi IC Chip Select
H
9
IN/
OUT
I
2
C BUS-
DATA
I
2
C BUS Data
Input/Output
H/L
10
OUT
I
2
C BUS-
CLK
I
2
C BUS Clock
Output
H/L
11
OUT
HiFi-CLK
HiFi IC Control
Clock Output
H/L
12
OUT
HiFi-
DATA
HiFi IC Control
Data Output
H/L
13
OUT
A-MUTE
Audio Mute Control
Signal (Mute="H")
H
14
IN
H-A-
COMP
Head Amp
Comparator Signal
H/L
15
OUT
C-ROTA
Color Phase Rotary
Changeover Signal
H/L
16
OUT
H-A-SW
Video Head Amp
Switching Pulse
H/L
17
OUT
RF-SW
Video Head
Switching Pulse
H/L
18
OUT
HiFi-H-
SW
HiFi Audio Head
Switching Pulse
H/L
19
OUT
REC-CTL
(+)
Record Control
Signal (+)
H/L
20
OUT
REC-CTL
(-)
Record Control
Signal (-)
H/L
21
IN
C-SYNC
Composite
Synchronized Pulse
PULSE
22
–
GND
GND
–
23
–
N.U.
Not Used
–
24
–
OSDVss
OSDVss
–
Pin
No.
IN/
OUT
Signal
Name
Function
Active
Level
25
IN
REC-SAF
-SW
Recording Safety
SW Detect (With
Record tab="L"/
With out Record
tab="H")
H/L
26
IN
C-VIDEO
-IN
Composite Video
Signal Input (Slicer)
–
27
IN
V-HOLD
Condenser
Connected Terminal
(Slicer)
–
28
–
HLF
LPF Connected
Terminal (Slicer)
–
29
–
GND
GND
–
30
OUT
OSD-BB-
OUT
Composite Video
Signal Output
(Blue Back)
–
31
OUT
OSD-
CHARA-
OUT
Character Output
(Superimposed)
–
32
–
OSDVcc
OSDVcc
–
33
OUT
D-V
SYNC-
OUT
Dummy V-sync
Output
H/Hi-z
34
IN
RESET
System Reset
Signal (Reset= "L")
L
35
IN
OSC
IN
Clock Input for
letter size
–
36
OUT
OSC
OUT
Clock Output for
letter size
–
37
–
Vcc Vcc
–
38
IN
X
IN
Main Clock Input
14.31818 MHz
–
39
OUT
Xout
Main Clock Output
–
40
–
Vss
Vss(GND)
–
41
IN
XC IN
Sub Clock 32 kHz
–
42
OUT
XC OUT
Sub Clock 32 kHz
–
43
IN
CLKSEL
Clock Select (GND)
L
44
–
N.U.
Not Used
–
45
OUT
SP/LP
/SLP
Tape Speed Select
Signal (SP="L"/
LP="Z"/SLP="H")
H/Z/L
46
OUT
C-POW
-SW
Capstan Power
Control
H/L
47
OUT
TRICK/
C-G/APC
Special Playback
/Copy Guard/APC
Control Signal
H/Z/L
1-12-1
Summary of Contents for VT-FX685A
Page 23: ...1 9 3 1 9 4 1 9 5 Main 1 4 Schematic Diagram PWR VCR PM REC ...
Page 24: ...1 9 6 1 9 7 1 9 8 Main 2 4 Schematic Diagram ...
Page 26: ...1 9 11 1 9 12 Main 4 4 Schematic Diagram ...
Page 27: ...1 9 13 1 9 14 Function Schematic Diagram ...
Page 28: ...Function CBA Top View Function CBA Bottom View 1 9 15 1 9 16 ...
Page 54: ... 48 49 S 17 Slide Holder S Slide Holder T S 18 50 L 3 Fig DM17 52 51 Slide P 9 Fig DM18 2 4 8 ...