Casio TV-600C, TV-600D, TV-600I, TV-600N Service manual

(with price)

POCKET TELEVISION
TV-600C
TV-600D
TV-600I
TV-600N
DECEMBER 1994
	Page
Specifications.............................................................................................	1
Block Diagram ...........................................................................................	2
Circuit Description......................................................................................	3
Adjustment
Linear PCB..........................................................................................	5
A/D PCB ..............................................................................................	9
Troubleshooting .......................................................................................	10
Printed Circuit Boards ..............................................................................	11
Wiring Diagram ........................................................................................	15
Exploded View / Disassembly..................................................................	16
Electrical Parts List ..................................................................................	17
Mechanical Parts List...............................................................................	23
IC and Transistor Lead Identification .......................................................	24
Schematic Diagrams and Waveforms .....................................................	26

INDEX

R

	SPECIFICATIONS
	Item		Specification
1.	Reception channels	VHF : 2 ~ 13 ch UHF : 14 ~ 69 ch
2.	Power voltage	DC 6.0 V
3.	Power consumption	Approx. 3.4 W
4.	Current consumption	Approx. 566 mA
5.	Battery life (with alkaline batteries)	Approx 3.0 hours
		Batteries	: 4 AA size batteries
6.	Power supply	Car adaptor : CA-K65
		AC adaptor	: ADK-65, 64
		Earphone jack		: 3.5ø mini
7.	Connection terminals	External power jack		: 6.0V DC IN
		External antenna jack		: 3.5ø mini
		Audio / Video jack		: 3.5ø
8.	Screen size	2.2 inches
9.	No. of Picture element	39,600 (110 × 360) dots
10.	Dimensions	81 (W) × 32 (D) × 131 (H) mm
		3 1/5" (W) × 1 1/4" (D) × 5 1/6" (H)
11.	Weight	220 g excepting batteries
		7.8 oz excepting batteries
12.	Standard accessories	Test batteries (R6 × 4)
		AC adaptor		: AD-K65, 64
13.	Options	Car adaptor		: CA-K65
		RF connector		: CF-13
		Antenna matching device : AS-35S
14.	Body color	Black

— 1 —

BLOCK DIAGRAM

Antenna

3IC200

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

7	IC500		5	IC300
Tuning
Voltage				Chroma		Common		LCD
Generator				Circuit		Driver

6IC700

				Osc.
				Display
									Segment
					Control
				A-D Converter					Driver
				Auto-Tuning
					Control
		VR800		8		Q800~Q802, Q804~Q806
	VCC2 (3.95±0.02 V)
Power					Display
	VCC6 (30.5~39.0 V)				Voltage
Supply
	VCC7 (53.5~72.5 V)	Brightness			Generator
	VEE1 (–6.3~–7.9 V)
		Control

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 the tuner TU 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 M52042FP

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

6— Osc./A-D Converter/Display Control/ Auto-Tuning Control : IC700 MSM6625-02 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~Q802, Q804~Q806, 2SD601A-R x 4, 2SB709A-R, 2SD1149-S Generates the display voltages V0 ~ V4 with VEE1 and VCC7 outputs from the power supply.

—2 —

CIRCUIT DESCRIPTION

TUNING VOLTAGE GENERATOR

BT

BS

Vcc 16

VCC6 VREF

1

						TU
						H/L
15	14	13	12	11	10	BU
						9
BS	BT	IN	OUT	TU	H/L	U/V
	IC500 MSC1169MS-K					GND
U1	U2	VL1	VL2	VH1	VH2
2	3	4	5	6	7	8
						VREF
					R500
					R501
					R502

GND

Figure 1

This circuit generates the DC tuning voltage BT for selecting a channel with a TU pulse being output from IC700.

IC500 has 3 circuits for converting pulses to voltages; it selects one of VHF-L, VHF-H, or UHF, and causes the tuning voltage to be output from the OUT terminal (pin 12). Figure 2 and Table 1 show the conditions for selection.

		IC500
		VHF	Inputs		Function
			U/V	H/L
		-L
	11		L	L	VHF-L receiving
TU		VHF	12
			L	H	VHF-H receiving
		-H
			OUT(BT)
				L	UHF receiving
			H
		UHF	H	H	UHF receiving
		9	10		Table 1
		U/V	H/L
		Figure 2

— 3 —

POWER SUPPLY

VCC1-1		T100
	CP100	2
		R111

Vref				Q111		1
		C135
					R115	9
	D100		R102	C140
		VR100			C145
		Q100

C100

C105

R101

Q101

R117

CP104

	VCC2-2	VCC2-3
	L102	R133
	D155
	3	VCC7
	D152
		CP108

4

VCC6

CP107

5

VCC2

		L101		CP109
6	D152
	D150
7				VEE1
				CP110
				C115
	C112	C110	C113	C114

GND

Figure 3

The power supply consists of a DC-DC converter and causes the voltages to be output as shown in Table 2.

Name	Voltage	Function
VCC2	3.95 ± 0.02 V	Main voltage
VCC6	30.5 ~ 39.0 V	Tuning voltage
VCC7	53.5 ~ 72.5 V	Tuning voltage/Display voltage
VEE1	–6.3 ~ –7.9 V	Display voltage

Table 2

— 4 —

		ADJUSTMENT
LINEAR PCB
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

Adjustment And Test Point Locations

T201

T200

Top View

— 5 —

VR100

	TP7
TP5	TP2	TP1
	PadIF
VR300		VR200

TP4

TP3

Bottom View

Equipment Connection / Adjustment Procedure

	VCC2 Voltage Setting
TV-600	Voltmeter
Set
	Output
	TP1

Input

Input

Input

Adjust

Output

Output

Result

Connection

Point

Signal

Connection

Point

VR100

Voltmeter

TP1

Adjust for 3.95 ± 0.02 V

reading on voltmeter.

— 6 —

Video Detection Coil Adjustment

* Desolder the IF pad to open.

Pattern

Signal

TV-600

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 (TV-

generator

Low-pass filter

TP2

600C, I, N)

T200

TP3

Adjust for DC level at mini-

Signal

39.5 MHz (TV-

Oscilloscope

generator

600D)

40 ± 3 dBμ

AFT Coil Adjustment

* Desolder the IF pad to open.

Sweep	TV-600	Oscilloscope	Voltmeter
generator	Set
Input		Output
TP2		TP4

38.9

± 5 MHz

Adjust for 2.0 ± 0.2 V reading

Sweep

(Sweep) Marker: 38.9 MHz

Voltmeter

on voltmeter.

TP2

±

μ

T201

TP4

generator

70

3 dB (TV-600C, I, N)

Confirm that the marker is at

39.5

± 5 MHz

Oscilloscope

the middle of S-curve on oscil-

(Sweep) Marker: 39.5 MHz

70dBμ (TV-600D)

loscope.

Contrast Adjustment

* Desolder the IF pad to open.

Pattern		Signal		TV-600
generator		generator		Set		Oscilloscope
			Input		Output
			TP2		TP5
Pattern	Color bar 38.9
	MHz
generator	70 ± 3 dBμ	VR300	Oscilloscope	TP5	Adjust step form wave to read
TP2	(TV-600C, I, N)				0.8	± 0.05 Vp-p.
Signal
	39.5 MHz 70 dBμ
generator
	(TV-600D)

— 7 —

AGC Adjustment

* Short the IF pads.
Pattern	Signal	TV-600
generator	generator	Set	IF levelmeter
	Input		Output
	TP7		TP2

Input

Input

Input

Adjust

Output

Output

Result

Connection

Point

Signal

Connection

Point

Pattern

Adjust for 84 ± 2 dBμ

generator

TP7

Color bar

VR200

IF levelmeter

TP2

(TV-600C, I, N)

TV signal

65 ± 5 dBμ

84

± 1 dBμ (TV-600D)

reading on the IF levelmeter

generator

— 8 —

A/D PCB

Item to Be Adjusted

Item	Measuring Instrument
Clock adjustment	Voltmeter

Adjustment And Test Point Locations

TOP VIEW

TP6

VR700

Equipment Connection / Procedure

	Clock Adjustment
TV-600	Voltmeter
Set
	Output
	TP6

Input

Input

Input

Adjust

Output

Output

Result

Connection

Point

Signal

Connection

Point

VR700

Voltmeter

TP6

Adjust for 2.05 ± 0.05 V read-

ing on voltmeter.

— 9 —