Casio EV-500C, EV-500D, EV-500I, EV-500N Service manual

(with price)

EV-500C(KX-615C)

EV-500D(KX-615D)

EV-500I (KX-615I)

EV-500N(KX-615N)

JUN. 1995

INDEX

R

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 .......................................................................	22
IC AND TRANSISTOR LEAD IDENTIFICATION ........................................	23
SCHEMATIC DIAGRAMS ...........................................................................	25
WAVEFORMS..............................................................................................	28

— 1 —

SPECIFICATIONS

	Item		Specification
		EV-500C,N: VHF: 2 ~ 12 ch			UHF: 21 ~ 69 ch
1.	Reception channels	EV-500D:	VHF: —		UHF: 21 ~ 68 ch
		EV-500I:	VHF: A ~ H2ch		UHF: 21 ~ 69 ch
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

— 2 —

BLOCK DIAGRAM

Antenna

			3	IC200	4	IC600	Speaker
1	TU200	2	Q200	Video
					VR600
				Sound Det.		Audio
	Tuner		IF Amp.	FM		Amp.
				AFT Circuit	Volume
				AGC Circuit	Control

	7	IC270	IC300
		5
	Tuning
	Voltage		Chroma	LCD
	Generator
			Circuit

6 IC700

Display

Control

Auto-Tuning

Control

		VCC2 (4.5 ± 0.02 V)
	Power	VCC7 (25.9 ~ 31.3 V)
		VCC6 (10.8 ~ 12.0 V)
	Supply
		VEE1 (–8.5 ~ –7.5 V)
		VEE2 (–19.8 ~ –17.2 V)

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

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 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.

— 3 —

CIRCUIT DESCRIPTION

POWER SUPPLY

Vcc1-1

CP100

			R108	270 K	R110	270
				Q110		2SD1819A-R
						Q111
		D100	R107	C137		2SD1119-R
6.3V 220	D110	MA142WK 33 K		B6800 p
		MA3051-L		C140		R115
		Q101
		2SD1819A-R		470 p		100
C100	C105 2.2	BH102K			2.2K	C145	B1500 p
		TM100	R105 3.3 K		R113
		VR100 2 K

GND

								L102		Vcc2-2
								330 u		(3.9 V)
T100		D158 MA143A	R160							Vcc7 (29.5 V)
2 LC12U-35	3
		C146	68							CP110
			(D: 180)							Vcc6 (11 V)
	4	220 p
		D156 MA142WK								CP111
1	5				L101					Vcc2-1 (4.5 V)
		D154 MA142WK			100 u					CP113
	6
9		D152
										VEE1 (-7.5 V)
	7	MA142WK
		D150								CP114
										VEE2 (-18 V)
6	8	MA142WK
		V2510	OPEN	V6.3220	V1647	V6.3220	V1622	V3522	K33
										CP115
CP101		C110	C150	C114	C112	C116	C118	C120	R150
										GND

Figure 1

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

— 4 —

		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

VR100

T201 T200

Top View

— 5 —

IF Pad	TP2(CP221)
VR200	TP7(CP207)
TP3(CP245)
TP4(CP240)

TP1(CP113)

TP8(VCOM)

VR740

TP6(CP311)

VR303

TP5(CP323)

VR300	T300

Bottom View

Equipment Connection / Adjustment Procedure

VCC2-1 Voltage Setting

EV-500

16-169

Voltmeter

set

Output

TP1

Input

Input

Input

Adjust

Output

Output

Result

Connection

Point

Signal

Connection

Point

VR100

Voltmeter

TP1

Adjust to obtain a 4.50 ± 0.02 V

reading on the voltmeter.

— 6 —

	Video Detection Coil Adjustment
* Desolder the IF pad to open.
Pattern	Signal	EV-500
generator	generator	set	Oscilloscope
		Low-pass
		filter
	Input	Output
	TP2	TP3

	Input	Input	Input	Adjust	Output	Output	Result
	Connection	Point	Signal		Connection	Point
	Pattern		Color bar
			38.9 MHz
	generator				Low-pass filter		Adjust to obtain the minimum
		TP2	(EV-200C,I,N)	T200		TP3
	Signal		39.5 MHz		Oscilloscope		DC level.
	generator		(EV-200D)
			45 ± 3 dBμ

AFT Coil Adjustment

* Desolder the IF pad to open.

		Sweep			EV-500
		generator			set		Oscilloscope		Voltmeter
				Input			Output
				TP2			TP4
			38.9 ± 5 MHz						Adjust to obtain a 1.4 ± 0.2 V
	Sweep		(sweep) marker:						reading on the voltmeter.
		TP2	38.9 MHz (EV-200C,I,N)			T201	Voltmeter	TP4
									Confirm that the marker is at
			39.5		± 5 MHz		Oscilloscope
	generator		(sweep) marker:						the middle of the S-curve on
			39.5 MHz (EV-200D)						the oscilloscope.
			70	±	μ
					3 dB
						Contrast Adjustment
	* Desolder the IF pad to open.								Vcc2-3
	Pattern				Signal		EV-500	10 kohm
	generator				generator		set		Oscilloscope
								CP312 (KILLER)
							Input	Output
							TP2	TP5(VC)

	Pattern		Color bar						Adjust so
									that the step
	generator		38.9 MHz
		TP2	(EV-200C,I,N)			VR300	Oscilloscope	TP5	form wave
	Signal		39.5 MHz						becomes 2.2
	generator		(EV-200D)						± 0.1 Vp-p.
			70	±	μ
					3 dB

2.2±0.1 V

P.P

— 7 —

BCC Adjustment

* Desolder the IF pad to open.

	Pattern		Signal		EV-500
	generator		generator		set		Oscilloscope
				Input		Output
				TP2		TP5(VC)
	Input	Input	Input	Adjust	Output	Output	Result
	Connection	Point	Signal		Connection	Point
	Pattern		Color bar				Adjust T300 so that the
			38.9 MHz
							difference	Pulse A Pulse B
	generator		(EV-200C,I,N)
							between pulses
	Signal	TP2	39.5 MHz	T300	Oscilloscope	TP5
							A and B is less
			(EV-200D)
	generator
			70 ± 3 dBμ				than 0.2 V.
				AGC Adjustment
	* Short the IF	pad.
	Pattern		Signal		EV-500
	generator		generator		set		IF levelmeter
				Input		Output
				TP7		TP2

Pattern

generator

Color bar

Adjust to obtain a 84

±

μ

TP7

VR200

IF levelmeter

TP2

2 dB

TV signal

65 ± 5 dBμ

reading on the IF levelmeter.

generator

Vcom Adjustment

EV-500

set

Oscilloscope

Output

TP8

Adjust VR303 so that the

high level of the square wave

VR303

Oscilloscope

TP8

is at -0.3

-0.5 ± 0.25 V

± 0.25 V.

5.0 ± 0.5 V

— 8 —

Vcom Adjustment

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

EV-500		Photo sensor amp.
set	Photo	Oscilloscope
		Bandpass
	diode
		filter
	ON	H
		M
	OFF	L

AV-C1

Audio/Video jack

Input

Input

Input

Adjust

Output

Output

Result

Connection

Point

Signal

Connection

Point

Photo sensor

VR303

amp.

Adjust to obtain the minimum

Bandpass filter

ripple.

Oscilloscope

Free-Running Frequency Adjustment

EV-500	Frequency
set	counter

Output

TP6

VR740

Frequency

TP6

Adjust to obtain a reading of

counter

15.625 ± 0.1 kHz.

— 9 —