R
TV-770B (KX-503B)
(without price)
(For NTSC)
JUN. 1996
TV-770B
CH
2
4
5
6
7
11
13
CH
14
30
40
50
60
69
INDEX
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
-- 1 --
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
SPECIFICATIONS
-- 2 --
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.
BLOCK DIAGRAM
Antenna
1 TU200
2 Q200
3 IC200
7
Tuning
Voltage
Generator
VR600
Volume
Control
4 IC600
Speaker
IC300
IC700
Common
Driver
LCD
Segment
Driver
Chroma
Circuit
Osc.
Display
Control
A-D Converter
Auto-Tuning
Control
5
6
8 Q800~Q803, Q805, Q806
VR800
Display
Voltage
Generator
Brightness
Control
VCC2 (3.95
± 0.02 V)
VCC7 (34.2 ~ 41.8 V)
VEE1 (6.1 ~ 7.3 V)
IC500
Power
Supply
Audio
Amp.
IF Amp.
Tuner
Video
Sound
Det.
FM
AFT Circuit
AGC Circuit
Det
-- 3 --
PRINTED CIRCUIT BOARDS
TOP VIEWS
Linear
Back Light
R335
R336
R255
R256
R236
C259
C281
R254
R252
R251
C263 C262
R261
C245
R212
R257
R253
R222
R209
C249
R224
C780
R808
R809
R810
C742
C741
C270
C740
R305
R306
C351
R226
C346
R322
C340
R310
R110
R108
C140
R115
R113
R704
C236
R816
R813
R820
C782
R745
R830
C750
D805
D803
Q101
Q110
D155
R738 D707
VR100
VR301
VR300
C330
VR700
R840
L101
R223
VR200
CN710
C305
C309
H300
C208
C210
C207
C202
C205
C606
C603
C806
C808
C700
C800
IC700
C112
C115
C105
C113
C100
C110
D150
SW100
T100
FU100
VR800
VR600
T200
T201
,,,,
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F220
,,,,
,,,,
F221
,,,,
,,,,
F210
,,,,
F211
,,
,,
,,
,,
F203
,,
,,
,,
,,
,,
,,
F200
L103
L102
L202
TU200
JK200
JK600
,,
,,
,,
,,
,,
,,
,,
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,,
CN700
JK100
D180
T950
C927
C925
CN950
L950