Casio EV-500B Fehlerbehebungshandbuch

(without price)

EV-500B(KX-615)

FEB. 1995

INDEX

— 1 —

CONTENTS

SPECIFICATIONS ......................................................................................... 2

BLOCK DIAGRAM ........................................................................................ 3

CIRCUIT DESCRIPTION ............................................................................... 4

ADJUSTMENT............................................................................................... 5

TROUBLESHOOTING................................................................................. 10

PRINTED CIRCUIT BOARDS ..................................................................... 11

WIRING DIAGRAM ...................................................................................... 13

EXPLODED VIEW ....................................................................................... 14

ELECTRICAL PARTS LIST......................................................................... 15

MECHANICAL PARTS LIST ....................................................................... 21

IC AND TRANSISTOR LEAD IDENTIFICATION ........................................ 22

SCHEMATIC DIAGRAMS ........................................................................... 24

WAVEFORMS.............................................................................................. 26

— 2 —

SPECIFICATIONS

Item Specification

1. Reception channels

2. Power voltage DC 6.0 V

3. Power consumption Approx. 3.7 W

4. Current consumption Approx. 617 mA

5. Battery life (with alkaline batteries) Approx. 2.0 hours

Batteries : 3 AA size batteries

6. Power supply Car adaptor : CA-K65

AC adaptor : AD-K65

Earphone jack : 3.5ø mini

7. Connection terminals External power jack : 6.0 V DC IN

External antennea jack : 3.5ø mini

Audio / Video jack : 3.5ø

8. Screen size 2.5 inches

9. No. of Picture element 61,380 (220 ×279) dots

10. Dimensions 75 (W) ×26.7 (D) ×120.8 (H) mm

3 (W) ×1 (D) ×4 3/4(H)

11. Weight 191 g excepting batteries

6.7 oz excepting batteries

12. Standard accessories Test batteries (R6 ×3)

AC adaptor : AD-K65,64

13. Options Car adaptor : CA-K65

RF connector : CF-13

Antenna matching device : AS-35S

14. Body color Black

VHF: 2 ~ 13 ch UHF: 21 ~ 69 ch

— 3 —

Antenna

1 TU200 2 Q200 3 IC200

Tuning

Voltage

Generator

VR600

Volume

Control

4 IC600 Speaker

IC300

IC700

LCD

Chroma

Circuit

Display

Control

Auto-Tuning

Control

VCC2 (4.5 ± 0.02 V)

VCC7 (25.9 ~ 31.3 V)

VCC6 (10.8 ~ 12.0 V)

VEE1 (–8.5 ~ –7.5 V)

VEE2 (–19.8 ~ –17.2 V)

IC270

Power

Supply

Audio

Amp.

IF Amp.Tuner

Video

Sound Det.

AFT Circuit

AGC Circuit

Det

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

Eliminatesthe carrier waveinthe video IFsignal,and picks upthevideo signal andthesound 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 IR3P90Y

Generates the tricolor (red, green, and blue) from the video signal.

6— Display control/Auto-tuning control: IC700 MSM6770GS

Controls the display.

7— Tuning voltage generator: IC270 BA10358F

Generates the tuning voltage with the tuning pulse output from 6.

BLOCK DIAGRAM

— 4 —

Vcc1-1

CP100

R108

270K

R110

270

Q110 2SD1819A-R

Q111

2SD1119-R

C137

R107

D100

MA142WK 33K B6800p

C140

CH470p R115

100

6.3 V 220C100

D110

MA3051-L

2.2

BH102K

TM100

Q101

2SD1819A-R

2.2KR113

R105

3.3K

VR100

C105

GND

C145

B1500p

CP101

T100

LC12U-35 D158 MA143A R160

C146 220p

D156 MA142WK

D154 MA142WK

D150

MA142WK

D152

MA142WK

L101

100u

L102

330u

CP110

CP111

CP113

CP114

CP115

C110 25 V 10

C114 6.3 V 220

C116 6.3 V 220

C120 35 V 22

R150 33K

Vcc2-2

Vcc7 (29.5 V)

Vcc6 (11 V)

Vcc2-1 (4.5 V)

VEE1 (-7.5 V)

VEE2 (-18 V)

GND

(3.9 V)

C112 16 V 47

C118 16 V 22

C150 OPEN

CIRCUIT DESCRIPTION

POWER SUPPLY

Figure 1

Name Voltage Function

VCC2-1 4.50 ±0.02 V Main voltage

VCC7 25.9 ~ 31.3 V Tuning voltage

VCC6 10.8 ~ 12.0 V Display voltage

VEE1 –8.5 ~ –7.5 V Display voltage

VEE2 –19.8 ~ –17.2 V Display voltage

Table 1

The power supply consists of a DC-DC converter and the associated circuit and supplies the voltages as shown

in Table 1.

— 5 —

ADJUSTMENT

LINEAR PCB

Items to Be Adjusted

Item Measuring Instrument

VCC2-1 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

Tint adjustment TV signal generator, pattern generator, oscilloscope

AGC adjustment TV signal generator, pattern generator, IF levelmeter

Vcom adjustment Photo diode, photo sensor amp., bandpass filter, oscilloscope

Free-Running frequency adjustment

Frequency counter

Adjustment and Test Point Locations

Top View

T201T200

VR100

— 6 —

VCC2-1 Voltage Setting

Input Input Input Output Output

Connection Point Signal Connection Point

Adjust Result

Adjust to obtain a 4.50 ±0.02 V

reading on the voltmeter.

Voltmeter

VR100 TP1

TP1

16-169

Equipment Connection / Adjustment Procedure

Bottom View

Output

Voltmeter

EV-500

set

— 7 —

Video Detection Coil Adjustment

TP2 VR300 TP5

Pattern

generator

Signal

generator

Oscilloscope

* Desolder the IF pad to open.

Contrast Adjustment

TP2 T201 TP4

Adjust to obtain a 1.4 ±0.2 V

reading on the voltmeter.

Confirm that the marker is at

the middle of the S-curve on

the oscilloscope.

* Desolder the IF pad to open.

AFT Coil Adjustment

Pattern

generator

Signal

generator

TP2 T200 TP3

Input Input Input Output Output

Connection Point Signal Connection Point

Adjust Result

* Desolder the IF pad to open.

Voltmeter

Oscilloscope

Sweep

generator

Pattern

generator Signal

generator

Input

TP2

Oscilloscope

Vcc2-3

EV-500

set

Adjust so

that the step

form wave

becomes 2.2

±0.1 Vp-p.

Adjust to obtain the minimum

DC level.

Low-pass filter

Oscilloscope

Input

TP2

EV-500

set

Output

TP3

Low-pass

filter

Pattern

generator Signal

generator Oscilloscope

Sweep

generator EV-500

set

Input

TP2 Output

TP4

Voltmeter

Oscilloscope

Output

TP5

2.2 ± 0.1 V

P.P

Color bar

45.75 MHz

45 ±3 dBµ

45.75 ±5 MHz

(sweep) marker:

45.75 MHz

70 ±3 dBµ

Color bar

45.75 MHz

70 ±3 dBµ

10 kohm

CP312 (KILLER)

— 8 —

Adjust VR301 so that the

difference

between pulses

A and B is less

than 0.2 V.

* Desolder the IF pad to open.

BCC Adjustment

Signal

generator

Pattern

generator EV-500

set Oscilloscope

Input

TP2 Output

CP339(VC)

5.0 ± 0.5 V

-0.5 ± 0.25 V

VR303 Oscilloscope TP8

Adjust VR303 so that the

high level of the square wave

is at -0.5

±0.25 V.

EV-500

set Oscilloscope

Output

TP8

Signal

generator

Pattern

generator EV-500

set IF levelmeter

Input

TP7 Output

TP2

* Short the IF pad.

Pattern

generator

TV signal

generator TP7 VR200 IF levelmeter TP2

Color bar

65 ±5 dBµAdjust to obtain a 84 ±2 dBµ

reading on the IF levelmeter.

Vcom Adjustment

AGC Adjustment

Pattern

generator

Signal

generator TP2 VR301 Oscilloscope TP5

Pulse BPulse A

Color bar

45.75 MHz

70 ±3 dBµ

Adjust Result

Input Input Input Output Output

Connection Point Signal Connection Point

— 9 —

Vcom Adjustment

* Place a photo diode on the middle of the display plate.

EV-500

set Photo

diode

OFF

AV-C1

Audio/Video jack

Bandpass

filter

Oscilloscope

Photo sensor amp.

Adjust to obtain the minimum

ripple.

VR303

Photo sensor

amp.

Bandpass filter

Oscilloscope

Free-Running Frequency Adjustment

Frequency

counter

VR740 TP6

Output

TP6

Frequency

counter

EV-500

set

Adjust to obtain a reading of

15.73 ±0.1 kHz.

Adjust Result

Input Input Input Output Output

Connection Point Signal Connection Point

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