R
TV-1800C(PAL B / G,H)
TV-1800D(PAL I)
TV-1800I (PAL B / G)
TV-1800N(PAL B / G,H)
(KX-523)
(without price)
DEC. 1996
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TUNING
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CONTENTS
Page
SPECIFICATIONS ..................................................................................... 1
BLOCK DIAGRAM .................................................................................... 2
CIRCUIT OPERATIONS ........................................................................... 3
PRINTED CIRCUIT BOARDS ................................................................... 4
PARTS LIST .............................................................................................. 6
EXPLODED VIEW ..................................................................................... 9
SCHEMATIC DIAGRAMS ....................................................................... 11
WAVEFORMS ......................................................................................... 14
-- 1 --
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
115,020 (540
× 213) 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
SPECIFICATIONS
Model
Color System
TV System
Channel
TV-1800C/N
PAL
B/G, H
CCIR
VHF: 2 ~ 12 ch
UHF: 21 ~ 69 ch
TV-1800D
PAL
/I
UK
--
UHF: 21 ~ 68 ch
TV-1800I
PAL
B/G
ITALY
VHF: A ~ H2 ch
UHF: 21 ~ 69 ch
-- 2 --
1
-- Color Tuner: TU200 TEPE5-01(TV-1800C/I/N) TU200 TEPB5-05(TV-1800D)
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 MSM662501 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 2SD1149S,
2SD601A-R
×3, 2SB709A-R
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~Q806
VR800
Display
Voltage
Generator
Brightness
Control
VCC2 (3.95V)
VCC7 (41.6~51.6V)
VEE1 (-6.5~-8.0V)
IC500
Power
Supply
Audio
Amp.
IF Amp.
Tuner
Video
Sound
Det.
FM
AFT Circuit
AGC Circuit
Det