Ic Pin Function Descriptions - Philips VR340/55 Service Manual

Comparison Chart of Models and Marks
Model
VR340/55
VR340/75
VR740/55
VR740/75
IC501( SERVO / SYSTEM CONTROL IC )
Pin IN/ Signal
Mark
No. OUT Name
1 - N.U.
PG-
2 IN
DELAY
POW-
3 IN
SAF
4 IN
END-S
5 IN
AFC
6 IN V-ENV
7 IN
KEY-1
8 IN
KEY-2
9 IN
LD-SW
10 OUT ST-S
11 -
N.U.
12 - N.U.
OUT D-V-
13
SYNC
REMOC
14 IN
ON-IN
15 OUT C-ROTA

IC PIN FUNCTION DESCRIPTIONS

Mark
A
B
C
D
"H" ≥ 4.5V, "L" ≤ 1.0V
Function
Not Used
Video Head
Switching Pulse
Signal Adjusted
Voltage
P-ON Power
Detection Input
Signal
Tape End
Position
Detect Signal
Automatic
Frequency
Control Signal
Video Envelope
Comparator
Signal
Key Scan Input
Signal 1
Key Scan Input
Signal 2
Deck Mode
Position
Detector Signal
Tape Start
Position
Detector Signal
Not Used
Not Used
Dummy V-sync
Output
Remote
Control Sensor
Color Phase
Rotary
Changeover
SIgnal
Pin
Mark
No.
A,B
16
C,D OUT H-A-SW
A,B
17
C,D
18
A,B
Active
19
Level
C,D OUT HiFi-H-
-
20
A/D
A,B OUT
21
C,D
A/D
A,B OUT
22
A/D
C,D
23
A/D
24
25
A/D
26
27
A/D
28
29
A/D
30
A/D
31
A/D
-
A,B
32
-
C,D
H/Hi-z
33
L
34
H/L
35
36
1-15-1
IN/ Signal
Function
OUT Name
- N.U. Not Used
Video Head
Amp Switching
Pulse
-
N.U. Not Used
Head Amp
H-A-
IN
Comparator
COMP
Signal
OUT RF-SW Video Head
Switching Pulse
- N.U. Not Used
HiFi Audio Head
SW Switching Pulse
- N.U. Not Used
Tuner System
TUN-
Control Signal
SW1
Output
- N.U. Not Used
Tuner System
TUN-
Control Signal
SW2
Output
- N.U. Not Used
-
N.U. Not Used
-
N.U. Not Used
- N.U. Not Used
-
N.U. Not Used
-
N.U. Not Used
- N.U. Not Used
-
N.U. Not Used
- N.U. Not Used
Recording
Safety SW
REC-
Detect (With
IN
SAF-
Record tab="L"/
SW
With out Record
tab="H")
-
N.U. Not Used
A- Hi-Fi Tape
IN
MODE Detection Signal
OUT D-REC- Delayed Record
H Signal
System Reset
IN RESET Signal
(Reset="L")
IN XC-IN Sub Clock
OUT XC-
Sub Clock
OUT
Active
Level
-
H/L
-
H/L
H/L
-
H/L
-
H/L
-
H/L
-
-
-
-
-
-
-
-
-
H
-
L
L
L
-
-
HE274PIN