FUNAI 23C-250, Service Manual

Page: 35 / 78

IC PIN FUNCTION
IC501 ( SERVO / SYSTEM CONTROL IC )
"H"
≥
4.5V, "L"
≤
1.0V
Pins that have * in the Pin No. section on table below
are not used.
Pin
No. IN/
OUT
Signal
Name
Function
Active
Level
1 IN
REMO
CON-IN Remote Control
Sensor
L
2 OUT
SECAM-
CHARA
-H SECAM or
MESECAM Mode
Super Inpose="H"
H
3 OUT
DEC/
PB-L
Control Output
Siganl to AV1 (Scart
Jack)
L
4 OUT
IIC BUS-
SCL-2
IIC BUS
Control
Clock
H/L
5
IN/
OUT
IIC BUS-
SDA-2 IIC BUS Control
Data
H/L
6 IN DAVN-L
VPS/PDC Data
Receive ="L"
L
7 OUT
TUN-
SW-1
Tuner System
Control Signal
Output
H/L
8 OUT
TUN-
SW-2
Tuner System
Control Signal
Output
H/L
9
IN/
OUT
IIC BUS-
SDA-1
IIC BUS
Control
Data
H/L
10 OUT
IIC BUS-
SCL-1 IIC BUS Control
Clock
H/L
11 – N.U. Not Used –
12 – N.U. Not Used –
13 – N.U. Not Used –
*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
Pin
No. IN/
OUT
Signal
Name
Function
Active
Level
22 – GND GND –
23 IN
SECAM
-H SECAM Mode at
High
H
24 – OSDVss OSDVss –
25 IN
REC-SAF
-SW
Recording Safety
SW Detect (With
Record tab="L"/
With out Record
tab="H")
H
26 IN
C-VIDEO
-IN Composite Video
Signal Input (Slicer)
–
27 IN VHOLD
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 –
MAIN
CLOCK Main Clock Input
17.734476 MHz
–
39 –
MAIN
CLOCK Main Clock Input
17.734476 MHz
–
40 – Vss Vss(GND) –
41 –
SUB
CLOCK
Sub Clock 32 kHz –
42 –
SUB
CLOCK
Sub Clock 32 kHz –
43 IN CLKSEL Clock Select (GND) L
*44 IN DUAL-L
Tuner Dual
Detector Signal
L
*45 IN ST-L
Tuner Stereo
Detector Signal
L
1-11-1 H8743PIN