Daewoo ST263 DVST7L3 Manuale utente

Service Manual

S/M No. :VTG7J3DET0

Apr.2002

DAEWOO ELECTRONICS CO., LTD.

http ://svc.dwe.co.kr

Video Cassette Recorder

Model: (PAL/SECAM MODELS)

ST263 (DVST7L3)

ALLT-MECHA (Hi-Fi/MONO)

DVST7L3

SAFETY & PRECAUTIONS

SAFETY CHECK AFTER SERVING

Examine the area surrounding the repaired location for damage or deterioration. Observe that screw, parts and wires

havebeenreturnedtooriginalpositions.Afterwards,performthefollowingtestsandconformthespecifiedvaluesinorder

to verify compliance whit safety standards.

1. Insulation resistance test

Confirm the specified insulation resistance between power cord plug prong and externally exposed parts of the set

(RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.)

greater than values given in table 1 below.

2. Dielectric strengthen test

Confirm specified dielectric strengthen between power cord

plug prongs and exposed accessible parts of the set

(RF terminals, antenna terminals, video and audio input output

terminals, microphone jack, ear phone jacks, etc.)

is greater than values given table 1.

3. Clearance distance

When replacing primary circuit component, confirm specified clearance distance (d), (d

’

) between soldered terminals,

and between terminals and surrounding metallic parts. See table below.

Rating for selected areas

* : Class model only

AC Line Voltage Region Insulation

Resistance Dielectric

Strength Clearance

Distance(d),(d)

100V Japan

MΩ

/500V DC

1kV AC 1min.

110 to 130V

USA & Canada

-900V AC 1min.

3.2

* 110 to 130V

200 to 240V

Europe

Australia

Latin America

MΩ

/500V DC 4kV AC 1min.

6(d)

8(d')

(a :Power cord)

This table is unofficial and for reference only. Be sure to confirm the precise values for your

particular country and locality

NOTE

SAFETY & PRECAUTIONS

4. Leakage current test

Confirm specified or lower leakage current between B(earth

ground, power cord plug prongs) and externally exposed accessi-

ble parts (RF terminals, antenna terminals, video and audio input

output terminals, microphone jacks, earphone jacks, etc.)

Measuring method:(Power ON) Insert load Z between B(earth

ground, power cord plug prongs) and exposed accessible parts.

Use on AC voltmeter to measure across both terminals of load Z.

See figure2 and following table.

Leakage current ratings for selected are as

AC Line Voltage Region Load Z Leakage Cur-

rent(

)Clearance Distance(d),(d’)

100V Japan 1k

Ω

1 mArms Exposed accessible parts

110 to 130V USA &Canada

15kmF

Ω

0.5mArms Exposed accessible parts

110 to 130V

200 to 240V Europe

Australia 2k

Ω

0.7mA peak

2mAdc Antenna earth terminals

50k

Ω

0.7mA peak

1mAdc Other terminals

This table is unofficial and for reference only. Be sure to confirm the precise values

for your particular country and locality.

NOTE

1. FRONT VIEWS FUNCTION

DVST7C3 FRONT VIEW

DVST7E3 FRONT VIEW

DVST7L3 FRONT VIEW

DVST7M3 FRONT VIEW

EXTERNAL VIEWS

2. REAR VIEWS FUNCTION

MONO 1 SCART TYPE REAR VIEW

MONO 2 SCART TYPE REAR VIEW

HI-FI 2 SCART TYPE REAR VIEW

MONO RCA TYPE REAR VIEW

HI-FI RCA TYPE REAR VIEW

ELECTRICAL ADJUSTMENT

1. PLAYBACK PHASE

ADJUSTMENT PROCEDURE

1. Play back the test tape. (DP-2)

2. Set the oscilloscope to the CHOP mode. Connect CH1 to the SW PULSE (PIN 4 of P502)

3. Connect CH2 to the ENVE signal (PIN5 of P502)

4. Insert PATH JIG and press "REC" button on the remote control.

5. Check the position of the V-sync from the rising edge of the SW pulse.

(Standard : 6.5H

0.5H)

ITEM MODE ADJUSTMENT

POINT CHECK POINT TEST

EQUIPMENT TEST

TAPE INPUT

SIGNAL

6.5H

ADJUSTMENT PLAY [REC] BUTTON PIN 4 & PIN 5

OF P502 OSCILLOSCOPE DP-2 NO SIGNAL

ADJUSTMENT PARTS MEASURING POINT

PCB : MAIN - TOP VIEW

TMI

BLOC PRE-

AMP

P502

TO PATH JIG

OSCILLOSCOPE

CH1 CH2

PATH JIG

SPECIFICATIONS

CHANNEL COVERAGE

INPUT/OUTPUT JACK TYPE

GENERAL

Power Requirement

Power Consumption

Temperature

Operating position

Dimensions (W x H x D)

Weight

Format

Tape Width

Tape Speed

Maximum Recording Time with full-size cas-

sette

AC 230V, 50Hz

Max. 17W (in REC mode)

C ~ 35

C (Operating)

-20

C ~ 60

Horizontal only

360 x 90 x 288 (mm)

Approx. 3.85 Kg

VHS standard

12.65mm

(SP) : 23.39mm/sec

(LP) : 11.70mm/sec

(SP) :240min, with E-240 video cassette

(LP) :480min, with E-240 video cassette

VIDEO

Signal system

Recording system

Input

Output

Signal-to-Noise ratio

Horizontal resolution

PAL/SECAM colour and CCIR monochrome signals, 625 lines/50 fields

Rotary two-head helicalscan with a slantdouble-azimuth combination video

head

1.0Vp-p, 75ohms, unbalanced

45dB (Rhode &Schwarz noise meter) with NETTETEIMAGE control at cen-

ter position

240 lines with NETTETE IMAGE control at center position

AUDIO

Recording system

Input

Output

Frequency Range

Signal to Noise Ratio

Audio Distortion

Longitudinal track

-8dBm, (CENELEC standard),more than 47 k-ohms, unbalanced

-6dBm, (CENELEC standard), less than 1k-ohms, unbalanced(100k-ohms,

load)

100Hz to 8,000Hz

More than 38dB

Less than 3% (SP)

TUNER

Tuning system

RF Output Voltage synthesized tuner Programmable V/S 99CH (Hyper band)

UHF channel 21~69 (52)

TIMER

Memory programmable

Back up time

Clock exactness

99 CH

Less than 1 Hour

In accordance with the exactness of power supply frequency (50Hz)

ACCESSORIES

Provided Accessories Remote control unit, RF Cable, Battery

SYSTEM

SECAM-L

PAL, SECAM-B/G, PAL-I/I

PAL, SECAM-B/G, D/K, HYPER BAND PAL-I

CHANNEL

VHF Ch 2~12

UHF Ch 21~69

CATV Ch X,Y,Z S1~S41 UHF Ch 21~69

Model

EUROPE Asia, South Africa, Australia

Jack Type

SCART Type RCA Jack (Phone Jack)

Design and specification can be subjected to change without notice.

CIRCUIT INFORMATION

1. INTERCONNECT WIRING DIAGRAM

CIRCUIT INFORMATION

2. POWER CIRCUIT DIAGRAM

CIRCUIT INFORMATION

POWER MODE

LOC. PIN EE PLAY REC.

IC802 12.46 2.46 2.46

24.81 4.83 4.82

3000.01

IC801 15.88 5.89 5.89

/803 24.81 4.83 4.83

30.25 0.25 0.25

43.1 3.1 3.1

POWER MODE

LOC. PIN EE PLAY REC.

Q801 E0 0 0

B-0.12 -0.11 -0.72

C323 323 323

Q802 E0 0 0

B0.25 0.26 0.17

C0.12 0.11 0.17

Q821 E12.58 12.6 12.6

B13.2 13.2 13.2

C15.6 15.36 15.4

Q822 E5.2 5.19 5.2

B5.89 5.89 5.89

C5.97 5.97 5.96

Q825 E0 0 0

C5.89 5.89 5.89

Q826 E0 0 0

B0.73 0.73 0.73

1. T801 PIN 1 X : 0.1KV DIV

Y : 5uS DIV

2. T801 PIN 3 X : 2V DIV

Y: 2mS DIV 3. T801 PIN4 X: 5V DIV

Y: 5uS DIV

4.IC801PIN3 X:0.5VDIV

Y : 5uS DIV

5.IC801PIN 4 X: 2V DIV

Y:5uSDIV

6. Q801 base X: 0.5V DIV

Y : 5uS DIV

Indice

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