Casio EV-2500C Fehlerbehebungshandbuch

(without price)

EV-2500C/I/N (KX-618C/I/N)

JUL. 1995

INDEX

— 1 —

CONTENTS

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

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

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

DISASSEMBLY ............................................................................................. 5

DIAL STRINGING DIAGRAM........................................................................ 6

ADJUSTMENT............................................................................................... 7

TROUBLESHOOTING................................................................................. 12

PRINTED CIRCUIT BOARDS ..................................................................... 13

EXPLODED VIEW ....................................................................................... 15

ELECTRICAL PARTS LIST......................................................................... 16

MECHANICAL PARTS LIST ....................................................................... 23

IC AND TRANSISTOR LEAD IDENTIFICATION ........................................ 25

SCHEMATIC DIAGRAMS ........................................................................... 27

WAVEFORMS.............................................................................................. 29

— 2 —

SPECIFICATIONS

Item Specification

1. Reception channels TV— EV-2500C/N: VHF: 2 ~ 12 ch UHF: 21 ~ 69 ch

EV-2500I : VHF: A ~ H2 ch UHF: 21 ~ 69 ch

RADIO— FM: 88~108 MHz AM: 530~1710 KHz

2. Power voltage DC 6.0 V

3. Power consumption Approx. 3.5 W

4. Current consumption Approx. 580 mA

5. Battery life (with alkaline batteries) Approx. 11 hours

Batteries : 3 D size batteries

6. Power supply Car adaptor : CA-K65

AC adaptor : AD-K65, 64

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 115 (W) ×61.7 (D) ×112 (H) mm

4 1/2(W) ×2 2/5(D) ×4 2/5(H)

11. Weight 360 g excepting batteries

12.7 oz excepting batteries

AC adaptor : AD-K65,64

12. Options Car adaptor : CA-K65

RF connector : CF-13

Antenna matching device : AS-35S

— 3 —

BLOCK DIAGRAM

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

EliminatesthecarrierwaveinthevideoIFsignal,andpicksupthevideosignalandthesoundIFsignal.

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.

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

VCC1 (4.5 ± 0.05 V)

VCC2 (4.5 ± 0.05 V)

VCC7 (25.9 ~ 31.3 V)

VCC6 (10.0 ~ 12.0 V)

VEE1 (–8.0 ~ –7.0 V)

VEE2 (–18.4 ~ –16.0 V)

IC270

Power

Supply

Audio

Amp.

IF Amp.Tuner

Video

Sound Det.

AFT Circuit

AGC Circuit

Det

— 4 —

CP105

R108

270K

R110

270

Q110 2SD1819A-R

Q111

2SD1119-R

C137

R107

D100

MA141K 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

C145

B1500p

CP106

T100

LC12U-35 D158 MA143A R160

C146 OPEN

D156 MA141K

D154 MA142WK

D150

MA142WK

D152

MA142WK

L101

100u

CP110

CP111

CP113

CP114

CP115

C110 25 V 10

C112

10SL6R8M

C114 6SL 15M

C116 6.3 V 100

C118 16 V 22

C120 35 V 22

R161 33K

VEE2 (-18.4 ~ -16.0 V)

L102

100u

R100

0R00

GND

CP112

VEE1 (-8.0 ~ -7.0 V)

VCC2-1 (4.5 V)

VCC6 (10.0 ~ 12.0 V)

VCC7 (25.9 ~ 31.3 V)

VCC2-2 (4.5 V)

VCC2-3 (4.5 V)

Figure 1

CIRCUIT DESCRIPTION

Name Voltage Function

VCC2-1 4.50 ±0.02 V Main voltage

VCC7 25.9 ~ 31.3 V Tuning voltage

VCC6 10.0 ~ 12.0 V Display voltage

VEE1 –8.0 ~ –7.0 V Display voltage

VEE2 –18.4 ~ –16.0 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.

POWER SUPPLY

— 5 —

DISASSEMBLY

1. Remove the battery case.

2. Remove the three screws and the lower case.

3. Remove the three knobs.

4. Remove the screw and resolder the two wires for the speaker.

5. Remove the PCB ass'y.

— 6 —

DIAL STRINGING DIAGRAM

Turn the pulley counterclockwise.

Wrap around 4 times.

0.8 mm

Sliding pointer

— 7 —

ADJUSTMENT

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

RADIO

When the radio is defect, replace the radio PCB unit.

Adjustment and Test Point Locations

Top View

VR100

VR303

T200

T201 VR200

T300

VR300

VR740

— 8 —

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

Output

Voltmeter

EV-2500

set

Bottom View

TP7 (CP208)

TP2 (CP201)

TP4 (CP217)

TP3 (CP218)

TP1 (CP113)

TP8 (CP334)

TP5 (CP339)

TP6 (CP322)

IF Pad

— 9 —

Video Detection Coil Adjustment

TP2 VR300 TP5

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

CP312 (KILLER)

Oscilloscope

EV-2500

set 10 kohm

Adjust so

that the step

form wave

becomes 2.8

±0.1 Vp-p.

Adjust to obtain the minimum

DC level.

Low-pass filter

Oscilloscope

Input

TP2

EV-2500

set

Output

TP3

Low-pass

filter

Pattern

generator Signal

generator Oscilloscope

Sweep

generator EV-2500

set

Input

TP2 Output

TP4

Voltmeter

Oscilloscope

Color bar

38.9 MHz

(EV-200C,I,N)

39.5 MHz

(EV-200D)

45 ±3 dBµ

38.9 ±5 MHz

(sweep) marker:

38.9 MHz (EV-200C,I,N)

39.5 ±5 MHz

(sweep) marker:

39.5 MHz (EV-200D)

70 ±3 dBµ

Output

TP5(VC)

Color bar

38.9 MHz

(EV-200C,I,N)

39.5 MHz

(EV-200D)

70 ±3 dBµ

Pattern

generator

Signal

generator

TP1

2.8 ± 0.1 V

P.P

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