TV1800B, Schematy
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TV-1800B
(NTSC)
(KX-523)
FEB. 1997
R
CONTENTS
Page
SPECIFICATIONS ..................................................................................... 1
BLOCK DIAGRAM .................................................................................... 2
CIRCUIT OPERATIONS ........................................................................... 3
PRINTED CIRCUIT BOARDS ................................................................... 4
PARTS LIST .............................................................................................. 6
EXPLODED VIEW ..................................................................................... 9
SCHEMATIC DIAGRAMS ....................................................................... 11
WAVEFORMS ......................................................................................... 13
SPECIFICATIONS
Item
Specification
1. Power voltage
DC 6.0 V
2. Power consumption
Approx. 3.6 W
3. Current consumption
Approx. 600 mA
4. Battery life (with alkaline batteries) Approx. 2.5 hours
Batteries
: 4
´
LR6 (D) size batteries
5. Power supply
Car adaptor : CA-K65
AC adaptor : AD-K65
Earphone jack
: 3.5 ø mini
6. Connection terminals
External power jack
: 6.0 V DC IN
External antenna jack
: 3.5 ø mini
7. Screen size
2.5 inches
8. No. of picture element
118,800 (540
´
220) dots
9. Dimensions
135 mm (H)
´
91 mm (W)
´
38 mm (D)
10. Weight
240 g without batteries
AC adaptor
: AD-K65
11. Options
Car adaptor
: CA-K65
Antenna matching device : AS-35S
Color System
TV System
Channel
NTSC
M / M
US
VHF: 2 ~ 13 ch
UHF: 14 ~ 69 ch
— 1 —
BLOCK DIAGRAM
Antenna
3 IC200
1 TU200
2 Q200
4 IC600
Speaker
Video
Sound
Det.
FM
AFT Circuit
AGC Circuit
VR600
Au
d
io
Amp.
Tuner
IF Amp.
Volume
Control
7
Tuni
n
g
Voltage
Generator
IC500
5
IC300
Chroma
Circuit
Common
Driver
LCD
6
IC700
Osc.
Display
Control
A-D Converter
Auto-Tuning
Control
Segment
Driver
VR800
8 Q800 ~ Q806, Q810, Q811
Po
w
er
Supply
VCC2 (4.3
±
0.02 V)
VCC7 (41.6 ~ 51.6 V)
VEE1 (-6.5 ~ -8.0 V)
Brightness
Control
Display
Voltage
Generator
1
— Color Tuner: TU200 TEPE5-02
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 the tuner TU 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 M52045FP
Generates the tricolor (red, green, and blue) from the video signal.
6
— Osc./A-D Converter/Display Control/ Auto-Tuning Control : IC700 MSM6625-01 GSK-640E
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 (TU) output from
6
.
8
— Display Voltage Generator: IC800 BA10358F, Q800 ~ Q806 Q810 Q811 2SD1149-S,
2SD601A-R
3, 2SB709A-R
Generates the display voltages V0 ~ V4 with VEE1 and VCC7 outputs from the power supply.
´
— 2 —
CIRCUIT OPERATIONS
IC700
TE2
TE4
TE6
VSS2
TE1
TE3
TE5
M6 M5 M4 M3 M2 M1
AFT
K
e
y
Switch
Control
KDB
KCB
AD2
A
F
T
Control
AVB
Test Control
Mode Control
UHF
AD1
B
Test
Circuit
G
Frequency
Divider
Sw
e
ep
Control
Mute
Control
A/D
MTB
R
Tuning Control
RLL
Cha
n
nel
bar
Control
Tuning V
o
ltage
UP/DOWN Counter
VLB
VDD2
Synchronism
Judgment
RHH
Pulse Width
Modulation D/A
TU
M7
M8
Freq
ue
ncy
Separator
M9
Mode
Control
Ph
a
se
Comparator
VDD1
C-S
PD
M10
PSi
VSS1
Display
Control
Vertical
positioning
Control
Horizontal
positioning
Control
Freq
u
ency
Divider
OSC1
Data Output
Oscillator
OSC2
D1 D2 D3 D4 D5 D6
CDB CFB CNB ECB
SNB SCB STB HDB
CK1 CK2
Signal Name
Function
Signal Name
Function
D1 ~ D6
Display data output terminal
MTB
Mute control terminal
SNB
Data latch signal
TU
Tuning control pulse output terminal
CDB
Scanning start signal
VLB
VHF High/Low channel select signal
output terminal
CFB
Output voltage changeover signal
UHF
VHF/UHF select signal
CNB
Scanning signal shift lock signal
AVB
KCB
Key input terminal
KDB
SCB
Brightness modulation pulse control
AFT
AFT voltage input terminal
STB
Sampling start signal
M1 ~ M10 Mode select signal input terminal
ECB
Signal input terminal controlling the
TE1 ~ TE6 Test terminal
segment drive terminal to "H" during
no display
CK1, CK2 Clock pulse output terminal
R, G, B
Original color
OSC1
Oscillator frequency control terminal
RLL
"L" level voltage input terminal of
OSC2
video signal
PD
Clock pulse adjustment terminal
RHH
"H" level voltage input terminal of
video signal
C-S
Synchronizing pulse input terminal
PS1
Mode control signal
HDB
Horizontal synchronizing signal input
VSS1
Power supply voltage input terminal
terminal
VDD1
VDD voltage input terminal
— 3 —
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