TV770B, Schematy
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TV-770B
(KX-503B)
(For NTSC)
JUN. 1996
TV-770B
R
CONTENTS
SPECIFICATIONS ......................................................................................... 1
BLOCK DIAGRAM ........................................................................................ 2
PRINTED CIRCUIT BOARDS ....................................................................... 3
EXPLODED VIEW ......................................................................................... 5
PARTS LIST .................................................................................................. 6
IC AND TRANSISTOR LEAD IDENTIFICATION ........................................ 10
SCHEMATIC DIAGRAMS ........................................................................... 13
WAVEFORMS .............................................................................................. 15
SPECIFICATIONS
Item
Specification
1. Reception channels
VHF: 2 ~ 13 ch
UHF: 14 ~ 69 ch
2. Power voltage
DC 6.0 V
3. Power consumption
Approx. 3.6 W
4. Current consumption
Approx. 600 mA
5. Battery life (with alkaline batteries) Approx. 4.0 hours
Batteries
: 4
´
LR6 (D) size batteries
6. Power supply
Car adaptor : CA-K65
AC adaptor : AD-K64, 65
Earphone jack
: 3.5 ø mini
7. Connection terminals
External power jack
: 6.0 V DC IN
External antenna jack
: 3.5 ø mini
8. Screen size
2.3 inches
9. No. of picture element
39,600 (110
´
360) dots
10. Dimensions
127 mm (H)
´
81 mm (W)
´
35 mm (D)
11. Weight
200 g without batteries
AC adaptor
: AD-K64, 65
12. Options
Car adaptor
: CA-K65
Antenna matching device : AS-35S
— 1 —
BLOCK DIAGRAM
Antenna
1
TU200
2
Q200
3
IC200
4
IC600
Speaker
Video
Sound
Det
Det.
VR600
Au
d
io
Amp.
Tuner
IF Amp.
FM
AFT Circuit
AGC Circuit
Volume
Control
7
Tuni
n
g
Voltage
Generator
5
IC300
Chroma
Circuit
Common
Driver
LCD
6
IC700
Osc.
Display
Control
A-D Converter
Auto-Tuning
Control
Segment
Driver
VR800
8
Q800~Q803, Q805, Q806
Display
Voltage
Generator
Po
w
er
Supply
0.02 V)
VCC7 (34.2 ~ 41.8 V)
VEE1 (–6.1 ~ –7.3 V)
±
Brightness
Control
1
— Color tuner: TU200 TEPU5-02
Selects a desired radio wave and changes it to the video IF signal.
2
— Video IF amp.: Q200 2SC4238
Amplifies the video IF signal output from tuner TU200 by 10 times (20 dB).
3
— Video det./Sound det./FM det./AFT/AGC: IC200 M51348FP
Eliminates the carrier wave in the video IF signal, and picks up the video signal and the sound IF signal.
Also, the sound signal is picked up from the sound IF signal by FM detection.
4
— Audio amp.: IC600 NJM2070M
Sound amplification.
5
— Chroma circuit: IC300 M52042FP
Generates the tricolor (red, green, and blue) from the video signal.
6
— Osc./A-D converter/display control/auto-tuning control: IC700 MSM6625-02 GSK-640F
Converts the color signal into a digital signal.
Also, generates the clock pulse for the display and controls the display.
7
— Tuning voltage generator: IC500 MSC1169MS-K
Generates the tuning voltage with the tuning pulse output from
6
.
8
— Display voltage generator: Q800~Q803, Q805, Q806, 2SD601A-R x 4, 2SB709A-R, 2SD1149-S
Generates the display voltages V0 ~ V4 with VEE1 and VCC7 outputs from the power supply.
— 2 —
IC500
VCC2 (3.95
PRINTED CIRCUIT BOARDS
TOP VIEWS
Linear
L103
H300
C305
VR301
R335
R336
R305
C351
C330
C210
R306
C208
F211
F210
T200
F221
R255
R256
R253
R222
T201
F220
R236
C259
C281
R254
C263 C262
R261
R209
C245
R212
R257
CN710
C800
D805
VR100
R110
R108
C140
R745
D803
Q110
Q101
C700
R113
D150
C750
VR600
R840
D155
T100
FU100
IC700
JK100
L101
VR800
R738
D707
Back Light
CN950
L950
T950
— 3 —
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