1-15-1
HE274PIN
IC PIN FUNCTION DESCRIPTIONS
Comparison Chart of Models and Marks
IC501( SERVO / SYSTEM CONTROL IC )
“H”
≥
4.5V, “L”
≤
1.0V
Model
Mark
VR340/55
A
VR340/75
B
VR740/55
C
VR740/75
D
Pin
No.
Mark
IN/
OUT
Signal
Name
Function
Active
Level
1
-
N.U.
Not Used
-
2
IN
PG-
DELAY
Video Head
Switching Pulse
Signal Adjusted
Voltage
A/D
3
IN
POW-
SAF
P-ON Power
Detection Input
Signal
A/D
4
IN
END-S
Tape End
Position
Detect Signal
A/D
5
IN
AFC
Automatic
Frequency
Control Signal
A/D
6
IN
V-ENV
Video Envelope
Comparator
Signal
A/D
7
IN
KEY-1
Key Scan Input
Signal 1
A/D
8
IN
KEY-2
Key Scan Input
Signal 2
A/D
9
IN
LD-SW
Deck Mode
Position
Detector Signal
A/D
10
OUT ST-S
Tape Start
Position
Detector Signal
A/D
11
-
N.U.
Not Used
-
12
-
N.U.
Not Used
-
13
OUT
D-V-
SYNC
Dummy V-sync
Output
H/Hi-z
14
IN
REMOC
ON-IN
Remote
Control Sensor
L
15
OUT C-ROTA
Color Phase
Rotary
Changeover
SIgnal
H/L
16
A,B
-
N.U.
Not Used
-
C,D
OUT H-A-SW
Video Head
Amp Switching
Pulse
H/L
17
A,B
-
N.U.
Not Used
-
C,D
IN
H-A-
COMP
Head Amp
Comparator
Signal
H/L
18
OUT RF-SW
Video Head
Switching Pulse
H/L
19
A,B
-
N.U.
Not Used
-
C,D
OUT
HiFi-H-
SW
HiFi Audio Head
Switching Pulse
H/L
20
-
N.U.
Not Used
-
21
A,B
OUT
TUN-
SW1
Tuner System
Control Signal
Output
H/L
C,D
-
N.U.
Not Used
-
22
A,B
OUT
TUN-
SW2
Tuner System
Control Signal
Output
H/L
C,D
-
N.U.
Not Used
-
23
-
N.U.
Not Used
-
24
-
N.U.
Not Used
-
25
-
N.U.
Not Used
-
26
-
N.U.
Not Used
-
27
-
N.U.
Not Used
-
28
-
N.U.
Not Used
-
29
-
N.U.
Not Used
-
30
-
N.U.
Not Used
-
31
IN
REC-
SAF-
SW
Recording
Safety SW
Detect (With
Record tab="L"/
With out Record
tab="H")
H
32
A,B
-
N.U.
Not Used
-
C,D
IN
A-
MODE
Hi-Fi Tape
Detection Signal
L
33
OUT
D-REC-
H
Delayed Record
Signal
L
34
IN
RESET
System Reset
Signal
(Reset=”L”)
L
35
IN
XC-IN
Sub Clock
-
36
OUT
XC-
OUT
Sub Clock
-
Pin
No.
Mark
IN/
OUT
Signal
Name
Function
Active
Level