TV350C, Schematy
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POCKET TELEVISION
TV-350C
OCTOBER 1994
Page
Specifications............................................................................................. 2
Block Diagram ........................................................................................... 3
Adjustment
Linear PCB ......................................................................................... 4
Printed Circuit Boards ................................................................................ 8
Wiring Diagram ........................................................................................ 10
Electrical Parts List .................................................................................. 11
Mechanical Parts List............................................................................... 17
Exploded Views / Disassembly ................................................................ 18
Schematic Diagrams and Waveforms ..................................................... 19
R
SPECIFICATIONS
Item
Specification
Reception Channels
VHF: Ch 2 ~ 12 ch UHF: Ch 21 ~ 69
Power Voltage
DC 6.0 V
Power Consumption
Approx. 3.0 W
Current Consumption
Approx. 500 mA
Battery Life (with alkaline batteries)
Approx. 3.0 hours
Batteries
: 4 AA size batteries
Power Supply
Car adaptor : CA-K65
AC adaptor : AD-K65
Connection Terminals
Earphone jack
: 3.5ø mini
External power jack : 6.0 V DC IN
Screen Size
1.6 inches
No. of Picture Element
39,600 (110
´
360) dots
Dimensions
122 mm (H)
´
66 mm (ø)
Weight
210 g excluding batteries
7.4 oz excluding batteries
Options
AC adaptor :
AD-K65
Car adaptor :
CA-K65
— 2 —
BLOCK DIAGRAM
Antenna
3 IC200
1 TU200
2 Q200
4 IC600
Speaker
Video
Sound
Det.
FM
AFT Circuit
AGC Circuit
VR600
Tuner
IF Amp.
Au
d
io
Amp.
Volume
Control
7
Tuning
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 ~ Q806
Po
w
er
Supply
VCC2 (3.95V±0.02V)
VCC6 (30.5 ~ 39.0V)
VCC7 (53.5 ~ 72.5V)
VEE1 (-6.3 ~ -7.9V)
Brightness
Control
Display
Voltage
Generator
1
— Color Tuner: TU200 TEPE5-01
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 (20dB).
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 MSM662502 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 (TU) output from
6
.
8
— Display Voltage Generator: Q800 ~ Q806 2SB1218A-R, 2SD1824R, S
´
2, 2SD1819A-R
´
5,
2SD1824-5
Generates the display voltages V0 ~ V4 with VEE1 and VCC7 outputs from the power supply.
— 3 —
IC500
ADJUSTMENT
Linear PCB
1) Items to Be Adjusted
Item
Measuring Instrument
VCC2 voltage setting
Voltmeter
Video detection coil adjustment
TV signal generator, Pattern generator, Oscilloscope,
Low-pass filter
AFT coil adjustment
Sweep generator, Oscilloscope, Voltmeter
Contrast adjustment
TV signal generator, Pattern generator, Oscilloscope
AGC adjustment
TV signal generator, Pattern generator, IF levelmeter
Clock adjustment
Voltmeter
2) Adjustment and Test Point Locations
TOP VIEW
T
2
0
1
T200
VR100
— 4 —
BOTTOM VIEW
TP7
VR200
TP2
Pad IF
TP3
TP4
VR700
TP6
VR301
TP5
VR300
3) Equipment Connection / Procedure
VCC2 Voltage Setting
TV-350
Set
Voltmeter
Output
TP1
Input
Input
Input
Adjust
Output
Output
Result
Connection Point
Signal
Connection Point
VR100
Voltmeter
TP1
0.02V
reading on voltmeter.
±
— 5 —
Adjust for 3.95
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