Daewoo DV-K11WZ Service Manual

Service Manual

Model :

DV -K1 1WZ-PB/A

DV -K1 1WY-PB DV -K1 1WZ-QB/A

DAEWOO ELECTRONICS CO., LTD OVERSEAS SERVICE DEPT.

GENERAL

Power requirement AC90~260V, 50/60Hz Power consumption Typical 13W Temperature 5¡£C~35¡£C (Operating)

-20

C~60 C

(Storage temperature) Operating position Horizontal only Dimensions (WxHxD) 360x90x312 (mm) Weight Approx 5.4kg Format VHS standard Tape widch 12.65mm Tape speed (SP): 23.39mm/sec Maximum recording time with full-size cassette (SP): 240 min. with E-240

video cassette Maximum recording time with full-size cassette (SP): 45 min. with E-45

cassette

VIDEO

Signal system PAL color and CCIR

monochrome signals,

625 lines/50 fields Recording system Rotary two-head helical scan

with a slant double-azimuth

combination video head Input 1.0Vp-p, 75 ohms, unbalanced Output 1.0Vp-p, 75 ohms, unbalanced Simal to noise rallio

More than 43 dB (Rohde & Schwarz

noise mater) Horizontal resolution

More than

240 lines

AUDIO

Input -8 dBs, (CENELEC standard)

more than 47 k-ohms, unbalanced

Output -6 dBs, (CENELEC standard),

less than 1 k-ohm, unbalanced (10 k-ohms, load)

Frequency range 100 Hz to 8,000 Hz

/20 Hz to 20 KHz (Hi-Fi)

Signal to noise ratio 38 dB (More than)

/60dB (More than):Hi-Fi

Audio Distortion Less than 3%(SP)

/Less than 0.5%(SP):Hi-Fi

RF Output UHF channel 36

(Adjustable 30~39)

ACCESSORIES

Provided Accessories Remote control unit

RF Cable, Battery

• Design and specifications can be subjected to change without notice.

SAFETY CHECK AFTER SERVICING

Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have been returned to original positions. Afterwards, perform the following tests and confirm the specified values in order to verify compliance with safety standards.

1. Insulation resistance test

Confirm the specified insulation resistance or greater between power cord plug prongs and externally exposed parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.). See table below.

2. Dielectric strength test

Confirm specified dielectric strength or greater between power cord plug prongs and exposed accessible parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.) See table below.

3. Clearance distance

When replacing primary circuit components, confirm specified clearance distance (d), (d') between soldered terminals, and between terminals and surrounding metalic parts. See table below.

Table 1: Rating for selected areas

* Class II model only. Note: This table is unofficial and for reference only. Be sure to confirm the precise values for your particular country and

locality.

4. Leakage current test

Confirm specified or lower leakage current between B (earth ground, power cord plug prongs) and externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.)

Measuring Method: (Power ON) Insert load Z between B (earth ground, power cord plug prongs) and exposed accesible parts. Use and AC voltmeter to measure across both terminals of load Z. See figure 2 and following table.

Table 2: Leakage current ratings for selected areas

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

AC Line Voltage Region

Insulation Dielectric Clearance

Resistance Strength Distance (d), (d')

100V Japan ≥ 1 MΩ/500 V DC 1kV AC 1 minute ≥ 3 mm

110 to 130V

USA &

– – –

900V AC 1 minute ≥ 3.2mm

Canada

* 110 to 130 V Europe ≥4 MΩ/500 V DC 3 kV AC 1 minute ≥ 6 mm (d)

200 to 240 V Australia ≥ 8 mm (d')

AC Line Voltage Region

Earth Ground

Load Z Leakage Current (i)

(B) to:

100V Japan ¡ ≤ 1m A rms

Exposed accessible

parts

110 to 130 V USA & ¡ ≤ 0.5 m A rms Exposed accessible

parts

¡ ≤ 0.7 m A peak Antenna earth

110 to 130 V Europe ¡ ≤ 2 m A dc terminals 200 to 240 V Australia ¡ ≤ 0.7 m A peak

Other terminals

1.5k

1.5kµF

50k

Fig. 1

Fig. 2

INFORMATION

Chassis

Primary circuit termimals

Exposed accessible part

AC Voltmter (high impedance)

Earth Ground power cord plug prongsB

1. CONTROLS AND FUNCTIONS

...................................................................................................2

2. ELECTRICAL ADJUSTMENTS

2-1. SERVO CIRCUIT ADJUSTMENT METHOD.......................................................................................3

2-2. AUDIO CIRCUIT ADJUSTMENT METHOD........................................................................................4

3. TROUBLE SHOOTING FLOW CHART

3-1. POWER CIRCUIT.................................................................................................................................5

3-2. SERVO-SYSCON CIRCUIT.................................................................................................................7

3-3. AUDIO CIRCUIT (NORMAL)..............................................................................................................12

3-4. AUDIO CIRCUIT (HI-FI)......................................................................................................................14

3-5. VIDIO CIRCUIT ..................................................................................................................................16

4. WA VEFORMS ON VIDEO CIRCUIT

........................................................................................22

5. µ-COM PART

.......................................................................................................................................25

6. CIRCUIT DIAGRAM

..........................................................................................................................27

6-1. CONNECTION DIAGRAM .................................................................................................................27

6-2. POWER CIRCUIT DIAGRAM.............................................................................................................28

6-3. SERVO/SYSCON CIRCUIT DIAGRAM.............................................................................................29

6-4. VIDEO & HEAD-AMP CIRCUIT DIAGRAM.......................................................................................30

6-5. AUDIO CIRCUIT DIAGRAM............................................................................................................... 31

6-6. HI-FI AUDIO CIRCUIT DIAGRAM......................................................................................................32

6-7. KARAOKE CIRCUIT DIAGRAM.........................................................................................................33

6-8. LOGIC SW CIRCUIT..........................................................................................................................34

7. COMPONENTS LOCA TION GUIDE ON PCB BOTTOM VIEW

.................................35

8. DISASSEMBLY

8-1. PACKING ASSEMBLY.......................................................................................................................37

8-2. SET ASSEMBLY.................................................................................................................................38

8-3. PAN ASSEMBLY................................................................................................................................ 39

9. ELECTRICAL PARTS LIST

............................................................................................................40

Z-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB D V-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11W Z-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB D V-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11W Z-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB D V-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11W Z-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB D V-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11W

VIDEO CASSETTE RECORDER

1. CONTROL AND FUNCTIONS

FRONT

DV-K11WZ-PB/A

DV-K11WY-PB (Hi-Fi)

DV-K11WZ-QB/A (NORMAL)

REAR

PLAY

AUTO REPEAT

REC

DIGITAL ECHO

VOL 1 VOL 2

MIC 1 MIC 2

PAUSE/STILL

REW PLAY FF

L Hi-Fi R

CST.IN NTSC A.REPEAT REC

DV-K11W

POWER STOP/EJECT

NTSC PLAY BACK RECORDING • HIGH SPEED REWIND

PLAY

AUTO REPEAT

REC

DIGITAL ECHO

VOL 1 VOL 2

MIC 1 MIC 2

PAUSE/STILL

REW PLAY FF CST.IN NTSC A.REPEAT REC

DV-K11W

POWER STOP/EJECT

NTSC PLAY BACK RECORDING • HIGH SPEED REWIND

RF OUT

CH.R CH.L

TEST

ON OFF

ANT. IN

VIDEO AUDIO

OUT

RF OUT

CH.R CH.L

TEST

ON OFF

ANT. IN

VIDEO AUDIO

OUT

SERVO CIRCUIT ADJUSTMENT METHOD

VIDEO HEAD SWITCHING POSITION

! Connection Method

@ Adjustment Procedure

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

2. Set the oscilloscope in the chop mode. Connect CH1 to the SW pulse(PT01 PIN#), and CH2 to the VIDEO OUT(R305 ) and trigger the scope with signal from CH1.

3. Adjust R595 to the positive rising edge of SW PULSE at 6.5H±0.5H from the V-SYNC.

2. ELECTRICAL ADJUSTMENT

Adjustment Parts Checking Point Measuring Equipment Mode Test Tape

R305 DP-2

R595

PT01 PIN ¤Ø

Oscilloscope PLAY

(STAIR STEP)

CH1

CH2

0.5H

6.5H ± 0.5H

VERTICAL SYNC

SW 30Hz (PT01 PIN)

(R305)

TRIGGER

R305

PHONE

JACK

MODULATOR

POWER

6.5H±0.5H

PT01 R595

MODULE

TOP VIEW

OSCILLOSCOPE

CH-1 CH-2

AUDIO CIRCUIT ADJUSTMENT METHOD

AUDIO RECORD BIAS

! Connection Method

@ Adjustment Procedure

1. Set the power on mode.

2. Set the input to open mode

3. Connect the Audio level meter to R01

4. After inserting a blank tape, record in SP mode.

5. Adjust R292 to obtain 3.0 mVrms.

Adjustment Parts Checking Point Measuring Equipment Test Tape Input Signal

R292

A/C Head PCB

Audio level meter Rec None signal

R01

3.0mVrms

PHONE

JACK

MODULATOR

DECK ASSY

A/C HEAD

R292

POWER

MODULE

A/CHEAD

Audio LEVEL METER

+ –

R01

3. TROUBLE SHOOTING FLOW CHART

POWER CIRCUIT

• When change the parts which are out of order, first, remove the power plug from the socket and then discharge the voltage across between both terminals of C807. (Use an external scores of KΩresistance)

• When check the primary circuit by using the oscilloscopes insulate the oscilloscope surely. (Use the isulating transformer) and must connect GND into the primary GND), (But there is no connection when check the secondary circuit).

• When change SM801(POWER MODULE), check FUSE and Cement resistance surely.

YES

Prepare the instrument

connecting the insulating trans.

Check F801 FUSE

Is voltage applied to D801?

Is voltage applied to the both terminals of C807?

Check power module

Check D801, L801

Check R802

NO output Voltage

Is voltage supplied

Via CN11?

The voltage of #1 of

IC11 is 5.7V and stable

The voltage of #1 of IC11

fluctuate

in 4.8V~5.7V

Measure resistance

between GND of CN21

and each terminal

of CN21

The 12DC of each

wire of T11 is ok

Primary parts is ok

Secondary parts ok

Change T11

Change parts

out of order

YES

Resistance >> 100Ω

YES

Check F801, L801,

D802

Check the secondary

circuit

YES

Check the pattern

and T11, L11, IC11

Terminal open and

measure the output

Voltage

Change parts

out of order

The voltage

is ok

Check the

parts outside

module

Check the Diode, Condenser inside

Module

No Voltage

output

SERVO SYSCON CIRCUIT

The voltage of pin

of IC601 is not

changed.

Is CTL pulse input

to pin IC501

Check and

re-adjust the

Path of Deck.

Check circuit

adjacent to IC601

Check C503, C504,

C506

check R539, C518

Check IC601

YES

NO NO

Noise appears

although adjusting

tracking.

Is CTL pulse out

from pin of IC601.

Noise shakes up

and down on the

screen.

Adjust

tracking

CTL HEAD height is

normal and there is

not dust.

Adjust the HEAD

height and remove

dust

Noise appears

although change

cassette tape.

Playback picture

is not good.

Playback picture

is not good.

Noise appears

on the screen

on the whole.

Is Enve.wavefrom

supplied to at pin of

PT01

Are SW pulse

applied to

HeadAmp circuit?

Check video circuit.

Check flow A

Is SW pulse supplied

from pin of IC601?

Check D.PG input

and connector.

Check pattern

Check connector, Head

Amp and Head dust.

Change head

YES

Auto stop during

playback

Is Reel pulse

applied to pin and

of IC601?

Check reel sensor.

Is D.FG applied to

pin of IC601

Check connector

D.FG circuits.

Check IC601

YES

Is Motor 12V supplied?

Is pin D.FG of

IC601 supplied.

Is pin D.PWM (pin )

of IC601 supplied?

Check connector

and Motor.

Check

POWER MODULE

Check C509, R523

Check IC601

YES

Drum M/T loading stops.

Is the input of pin

of PJ502 2V-3.5V?

Is pin of PJ502 2.5V

Is pin (C.PWM)

of IC601 Supplied?

Check connector

and Motor

Check power circuit.

Check circuit of R515,

R516, R517.

Check R541, R542

Check IC601

YES

Is Motor 12V supplied?

Capstan M/T loading stops.

Is C. Sync applied to

pin of IC601?

Check Motor.

Check C. Sync of

IC 401 and Pattern

YES

Drum M/T and Capstan M/T rotate

at regular speed. (In REC mode)

Is EVER 5V supplied?

Does X601 crystal osciliate?

Is CAM SW DATA Correct?

Check IC502.

Check IC 601.

Check power circuit.

Check IC601 and X601.

Recheck connector

and CAM SW contact.

YES

Emergency mode when plugging

(Power cord)

Cassette is not

inserted.

Is Motor 12V supplied?

Check power

circuit

CAM DATA is changed

when CST IN?

Is 5V applied to

pin of IC502 when CST IN?

Chek IC502

Check connector. Check DECK part.

Is 5V supplied at

pin of IC601?

Check PATTERN

Check IC601

YES

NO NO

YES

AUDIO CIRCUIT (NORMAL)

No sound in the playback mode.

Is the output at pin‘

of IC201?

Is 9V applied to pin &

of IC201?

Check power circuit.

Is 5V applied to

1of IC201?

Is there Audio output

at pin of IC201?

Check PJ504

and HEAD.

Check circuit adjacent

to R211, R212

NO NO

YES

Is pin=of IC201 0V?

Check IC 601

Is pin # of IC201

GND?

Check IC201

YES

Is the signal applied to

pin 6 of IC201?

Is 5V applied to

pin = of IC201?

Is there output at pin “

of IC201?

Does T201 oscillate?

Check IC601.

Check IC201.

Is the voltage above 10V

at pin # of T201?

Check T201

Is record current

3.0mVrms?

Is pin of IC201 0V?

Clean HEAD.

Asjust Record current.

Check IC201.

YES

No sound in the playback

mode after recording

Check circuit adjacent

R209, R210, C207

Check Q201

collector:above 10V

Base: 0V

Check Q202 and T201.

Check Q201.

+ 36 hidden pages