Casio SY-20B Bedienungsanleitung

SY-20B (KX-529B)

MAY. 2000

SY-20B

(without price)

INDEX

CONTENTS

SPECIFICATIONS ......................................................................................... 1

BLOCK DIAGRAM ........................................................................................ 2

ADJUSTMENT............................................................................................... 3

PRINT CIRCUIT BOARDS ............................................................................ 8

EXPLODED VIEW ....................................................................................... 10

PARTS LIST ................................................................................................ 11

SCHEMATIC DIAGRAMS ........................................................................... 13

DRIP-PROOF PERFORMANCE Q & A....................................................... 15

— 1 —

Item Specification

1. Type LCD Color Television

2. Reception Frequencies: UHF: UHF band CH 14 – CH 69

VHF: VHF band CH 2 – CH 13

3. Display Element: High resolution color liquid crystal display

(Super Twisted Nematic Type)

4. Drive System: Passive matrix system

5. Screen Size: 2.3 inches

6. Backlight: High luminance fluorescent material

7. Antenna: Rod antenna (VHF, UHF)

8. Speaker: 12/16ø inches (28 mm) X1

9. Connection Terminals: External antenna jack (3.5ø mini)

Earphone jack (3.5ø mini)

External power source jack (DC 6V)

Audio/Video input jack (3.5ø mini)

10. Power Supply: 3-way power supply system

Batteries: 4 AA-size dry batteries

AC: AC adaptor AD-K64/AD-K65 (option)

Car battery: Car adaptor CA-K65 (option)

11. Power Consumption: Approx. 3.6 W

12. Ambient Temperature Range: 32°F (0°C) ~ 104°F (40°C)

13. Dimensions: 56/16" (W) X 23/16" (D) X 36/16" (H) inches

136 (W) X 56 (D) X 85 (H) mm

14. Weight: Approx. 9.2 oz 260 g (excluding batteries)

SPECIFICATIONS

— 2 —

BLOCK DIAGRAM

LCD DRIVER (5151)

UPKEY CH

DOWNKEY

LAMP

Vcc1-1,GND

Vcc2-0,GND

V1,V3,V0,V4,VC

CK1,CK2

D1 ~ 6

SNB,STB

CNB2,CDB2,CFB2

EN1,EN2

MODULE

POWER

SUPPLY

MODULE

CONTROLL

SIGNAL

AUDIO2

Vcc7 VEE1

Vcc2

Vcc1-1

AVB

VIDEO2

AUDIO1

VIDEO1

A-MUTE

RGB

C-SYNC

AUDIO1

VIDEO1

H/L

U/V

AFT

Vcc2-8

Vcc7

ANT AGC

Vcc1-1

Vcc2 (4V)

Vcc2 (4.0V)

Vcc7 (40V)

VEE1 (-5V)

AFT

A-MUTE

EAR PHONE

EXTERNAL ANT

BATTERY 1.5V x 4

AC ADAPTOR 6V

EXTERNAL VIDEO

EXTERNAL AUDIO

U/V

CN900

Vcc2-8,GND

KDB,SP+,SP-

CN701

CN950

CN700

Vcc2

TUNER

(TNS-010US)

ANT

JACK PRE

AMP SAW

FILTER VIF/SIF

(M51348FP)

CHROMA

(M52042FP)

TUNING

BT GEN

(BA10358) VOLTAGE

SUPLLY

FOR LCD

DRIVER

AV JACK

LCD

INVERTER

TRANS

LCD

DRIVER

(651)

A/D CONVERTER

CONTROLLER

(OM6006)

AUDIO AMP

(NJM2070M)

POWER SW

BAND SW DC/DC

CONVERTER

TRANS

LCD DRIVER

(651)

L-PCB

BL-PCB

LCM

SW PCB

LCD DRVER(5151)

— 3 —

ADJUSTMENT

1. Vcc2 adjustment, Vcc7, Vee1 voltage check

2. LLD coil adjustment

3. Free running frequency adjustment

4. Contrast adjustment

5. TINT adjustment

Preparations

1. Connect AVB (CP725) to GND.

2. Set SW100 on UHF mode.

Adjustment And Test Point Locations

Top View

BottomView

T 200

VR 300

VR 301

VR 100

CP 102

CP 101 CP 305

CP 238

CP 320 CP 300

CP 740

CP 104

CP 103 CP 729

CP 701

— 4 —

Adjustment procedures

1. Vcc2 adjustment, Vcc7, VEE1 voltage check

•Condition

(1) Signal

No signal

(2) Other conditions

Power supply: Vcc1-1 (CP101) = 5.00 ±0.05 [V]

•Adjustment

Apply 5.00 ±0.05 [V] on Vcc1-1 (CP101).

Adjust VR100 so that Vcc2 (CP102) voltage becomes 4.00 ±0.02 [V].

•Checking

Vcc7 (CP103) = 36.0 ~ 44.0 [V]

VEE1 (CP104) = –4.50 ~ –6.00 [V]

•Block diagram

2. LLD coil adjustment

•Conditions

(1) Signals

Broadcasting system: M/M

Color system: NTSC color bar

(2) Signal level

Input electric field: 40 ±5 dBµ(IF AGC full gain), P/S = 10 dB

(3) Other conditions

US IF (Input electric field: terminated with 75 Ωresistance)

Power supply: Vcc1-1 (CP101) = 5.00 ±0.05 [V]

•Adjustment

Monitor video detection signal (CP238) via a low-pass filter of 100 kHz cutoff frequency and adjust LLD coil

T200 so that its DC level is minimum (waveform’s amplitude is maximum).

•Confirmation

There should be no waveform distortion (erroneous synchronization, etc.), under sensitivity (video detector

output level is abnormally small, etc.).

•Block diagram

VDigital

Voltmeter

L-PCB

Stabilizer

Vcc1-1

Vcc7

Vcc2

VEE1

Vcc1-1

IF signal

L-PCB

Adjust to minimize the DC level.

Oscilloscope

DC IN

Detector OUT

Signal

generator

Stabilizer

Low-Pass Filter

— 5 —

3. Free running frequency adjustment

•Conditions

(1) Signal

No signal (NTSC standard signal should be applied only at synchronous check)

(2) Signal level

Input electric field only at synchronous check: 70 ±3 dBµ(terminated with 75Ωresistance),

P/S = 10 dB

(3) Other conditions

US IF input only at synchronous check (input electric field with 75 Ωtermination).

Connect SYF terminal (CP729) and Vcc2-7 (CP701).

Power supply: Vcc1-1 (CP101) = 5.00 ±0.05 [V]

Room temperature: 20 ±10 [°C]

•Adjustment

Monitoring HDB (CP305) with a frequency counter, adjust VR700 so that the frequency is 15.734 ±0.1 [kHz].

•Caution

(1) Disconnect the wire between SYF terminal. Applying IF signal make sure that synchronization is normal

on the display.

(2) Use input signal pattern conforming CCIR standard.

•Block diagram

L-PCB

SYF

Vcc2-7

HD Frequency

Counter

Vcc1-1

IF signal

Signal

generator

Stabilizer

— 6 —

4. Contrast adjustment

• Conditions

(1) Signals

Broadcasting system: M/M

Color system: NTSC color bar (white 75%)

(2) Signal level

Input electric field: 70 ±3 dBµ(terminated with 75Ωresistance), P/S = 10 dB

(3) Others

US IF input (input electric field should be terminated with 75Ωresistance)

Power supply : Vcc1-1 (CP101) = 5.00 ±0.05 V

•Adjustment

(1) Connect color terminal (CP320) to GND (CP300) so that screen becomes black and white.

(2) Adjust contrast pot VR300 so that the voltage between pedestal level and white level of B signal

(CP740) is 0.80 ±0.05 [V].

•Caution

(1) Make sure that waveforms are not distorted.

(2) Connect COLOR terminal of Chroma IC (M52042FP) to GND.

(3) Monitor the B output signal with an oscilloscope via a low-pass filter (C = 2700 pF, R = 100 Ω).

•Block diagram

L-PCB

Vcc1-1

IF signal

Signal

generator

Stabilizer

B output

Low-pass filter Oscilloscope

— 7 —

5. TINT adjustment

•Condition

(1) Signal

Broadcasting system: M/M

Color system: NTSC color bar (white 75%)

(2) Signal level

Input electric field: 70 ±3 dBµ(75Ωtermination), P/S = 10 dB

(3) Other conditions

US IF input (input electric field should be terminated with 75Ωresistance).

Power suppiy : Vcc1-1 (CP101) = 5.00 ±0.05 [V]

•Adjustment

Observing B output signal (CP740) with an oscilloscope, adjust TINT pot VR301 so that amplitude difference

between two center pulses is 0.1 [V]

•Caution

(1) Do not connect COLOR chroma IC (M52042PP) terminal of to GND.

(2) Monitor B output signal with an oscilloscope via a low-pass filter (C = 2700 pF, R =100 Ω)

•Block diagram

VCC1-1

IF signal

Signal

generator

Stabilizer

L-PCB

B output

Oscilloscope

Low-pass filter

— 8 —

PRINTED CIRCUIT BOARDS

TOP VIEWS

Linear

Connector

Andere Handbücher für SY-20B

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