Table of Contents
Advertisement
Pin No.
Pin Name
44
Vref (OSD)
45
CV OUT
46
CHAR BIAS
47
AFC LPF
48
AFC OSC
49
Vss (OSD)
50
DOSC IN
51
DOSC OUT
52
4fsc OUT
53
4fsc IN
54
COMPOSITE SYNC.
55
VCR "H"
56
SERVO PB "H"
57
CST SW "H"
58
C-SYNC "H"
59
OSD "H"
POWER
60
CONTROL "H"
CAPSTAN
61
REVERSE "H"
62
AUDIO MUTE "H"
63
Z-SEARCH "H" (18V)
64
OTPB "H"
65
EXT REC "H"
66
JUST PWR ON
OPT RTNC
67
(CTL MON)
68
TEST "H"
69
X-TAL 2
70
X-TAL 1
71
Vss (SYS)
I/O
–
GND.
O
The video signal is output to the RF modulator and line output jack.
–
GND.
Horizontal sync is used to lock the OSD.
I
(Reduce Jitter)
–
GND.
I
OSD DOT CLOCK oscillator. (OSD charactor oscillator)
Determining the horizontal position (left or right) of OSD.
O
O
Oscillator for OSD Sync. signal.
Generating a blue background.
I
- Receives composite signal from Y/C circuit.
I
- Separates V-sync and H-sync in the OSD internal block.
- The sync signal determines the character position of OSD.
1. Turns on modulator thus allowing audio/video signal to output on CH3 or CH4.
2. Selects TV mode automatically upon turn on.
O
3. Output "H" turns power on to the VCR.
4. If tape is loaded in the VCR, PB mode is automatically selected.
O
Output "H" port to control, CFG gain control port in PB mode.
1. Port to detect CST(cassette tape) switch input state.
I
2. With CST S/W input state, determaines whether CST tape is inserted or not.
I
C-sync input port for servo control.
O
High "H" applied, turns on the OSD or POWER.
1. A signal to switch voltages (5.3V, 12V) on/off whitch is controlled by the power
O
key.
2. Outputs "H" in power On mode. Outputs "L" in power Off mode.
A signal to control capstan motor's direction of rotation.
O
"L" output = Reverse direction. "H" output = Forward direction.
1. Outputs "H" to mute audio signal in search mode and without sync signal.
2. Outputs "H" to eliminate pop noise generated in each mode during early switching
O
point (Approx. 500ms)
(EE/VV, TUNER/LINE, POWER ON/OFF, CH. UP/DOWN etc.)
O
Switches capstan motor voltage to 18 V.
O
Output "H" port to light the OTPB LED.
O
Output chip enable signal for ACSS IC (IC5A1)
O
Output "H" port in auto clock setting mode.
I
Option check port
I
GND.
O
1. 32.768 kHz oscillator is used as standard clock for clock display.
2. When Vcc supplied, oscillation occurs.
I
µ-COM main ground.
–
34
Description
Advertisement
Table of Contents
