DAEWOO DV-K10DY-QB-E, DV-K12DY-QB-E, DV-K10DY-QB-D, DV-K12DY-QB-D, DV-K12D-QB-D Service Manual

...

DAEWOO ELECTRONICS CO., LTD.

Service Manual

MODEL :

STOP/EJECT

POWER

INFRARED

REMOTE SENSOR

REW

PLAY

CASSETTE IN

REW PLAY FF RECORD

BLUE DIAMOND II

NTSC PLAY BACK ON PAL TV

DV-K10W

DV-K10DY-QB/E DV-K12DY-QB/E DV-K10DY-QB/D DV-K12DY-QB/D DV-K12D-QB/D DV-K10DZ-QB/D DV-K10P-QB

SPECIFICATIONS

GENERAL

Power requirement AC90~260V, 50/60Hz Power consumption Typical 10W Temperature 5¡£C~35¡£C (Operating)

-20

C~60 C

(Storage temperature) Operating position Horizontal only Dimensions (WxHxD) 280x90x345 (mm) Weight Approx 3.6kg 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 colour 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 45 dB (Rohde & Schwarz

noise mater) with NETTETE

IMAGE contol at centre

position Horizontal resolution 240 lines with NETTETE

IMAGE control at centrne

pomition

AUDIO

Input -8 dBs, (CENELEC standard)

more than 47 k-ohms, unbalanced

Output -6 dBs, (CENELEC standard),

less than 1 k-ohm, unbalanced

(100 k-ohms, load) Frequency range 100 Hz to 8,000 Hz Signal to noise ratio 38 dB (More than) Audio Distortion Less than 3% (SP) 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

locality.

Fig. 2

AC Line Voltage Region

Insulation Dielectric Clearance

Resistance Strength Distance (d), (d')

100V Japan ≥ 1 MΩ/500 VDC 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')

(a: Power cord)

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

¡ ≤ 2 m A dc

Fig. 1

1.5k

1.5kµF

50k

Chassis

Primary circuit termimals

Exposed accessible part

Earth Ground power cord plug prongsB

AC Voltmter (high impedance)

TABLE OF CONTENTS

SECTION 1. CONTROLS AND FUNCTIONS..........................................................................................................2

SECTION 2. ELECTRICAL ADJUSTMENTS

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

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

SECTION 3. TROUBLE SHOOTING FLOW CHART

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

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

3-3. AUDIO CIRCUIT...............................................................................................................................................................13

3-4. VIDIO CIRCUIT ................................................................................................................................................................15

SECTION 4. WA VEFORMS ON VIDEO, MAIN CIRCUIT................................................................................22

SECTION 5. µ-COM PORT.............................................................................................................................................24

SECTION 6. CIRCUIT DIAGRAM................................................................................................................................26

6-1. CONNECTION DIAGRAM...............................................................................................................................................26

6-2. POWER CIRCUIT DIAGRAM ..........................................................................................................................................27

6-3. SCART/MAIN CIRCUIT DIAGRAM.................................................................................................................................28

6-4. VIDEO & HEAD-AMP.......................................................................................................................................................29

6-1. AUDIO CIRCUIT DIAGRAM.............................................................................................................................................30

SECTION 7. COMPONENTS LOCA TION GUIDE ON PCB BOTTOM VIEW........................................31

SECTION 8. SECTION EXPLODED VIEWS AND PARTS LIST...................................................................32

8-1. PACKING ASSEMBLY (DV-K10D)..................................................................................................................................32

8-2. APCKING ASSEMBLY (DV-K12D)..................................................................................................................................33

8-3. CHASSIS ASSEMBLY (DV-K10D) ..................................................................................................................................34

8-4. CHASSIS ASSEMBLY (DV-K12D) ..................................................................................................................................35

SECTION 9. ELECTRICAL P AR TS LIST..................................................................................................................36

SECTION 10. OPTION T ABLE......................................................................................................................................43

SECTION 1. CONTROLS AND FUNCTIONS

STOP/EJECT

POWER

INFRARED

REMOTE SENSOR

REW

PLAY

CASSETTE IN

REW PLAY FF RECORD

BLUE DIAMOND II

NTSC PLAY BACK ON PAL TV

DV-K10W

PLAY

REW

POWER STOP/EJECT

REW CST IN FF REC

DV-K12W

BLUE DIAMOND II

NTSC PLAY BACK ON PAL TV

CH.H

EURO-AV

CH.L

RF OUT

ANT. IN

TEST

OFF

RF OUT

ANT. IN

VIDEO AUDIO

OUT

CH.H CH.L

TEST

OFF

FRONT

DV -K10W

REAR

DV -K12W

2-1. SERVO CIRCUIT ADJUSTMENT METHOD

1. VIDEO HEAD SWITCHING POSITION

• Connection Method

• Adjustment Procedure

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

2) Set the oscilloscope in the chop mode connect the CH1 to SW pulse(PT01 PIN#), the CH2 to VIDEO OUT(R307 ) with

CH1 triggering.

3) Adjust R592 for the positive trigger unitill 6.5±0.5H cycles before the vertical SYNC pulse.

SECTION 2. ELECTRICAL ADJUSTMENT

Adjustment Parts Checking Point Measuring Equipment Mode Test Tape

R307

DP-2

R592

PT01 PIN ¤Ø

Oscilloscope PLAY

Modulator

CH-1

OSCILLOSCOPE

CH-2

DECK

PT01 PIN3

R592

S M P S

P O W E R

R307

CH1

CH2

0.5H

6.5H ± 0.5H

VERTICAL SYNC

SW 30Hz (PT01 PIN)

(R307)

TRIGGER

2-2. AUDIO CIRCUIT ADJUSTMENT METHOD

1. 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 both R01

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

5) Adjust R292 to obtain 3.0 mVrms.

+ –

A/CHEAD

R101

Audio LEVEL METER

DECK ASSY

R292

S M P S

P O W E R

A/C HEAD

Adjustment Parts Checking Point Measuring Equipment Test Tape Input Signal

R292

A/C Head PCB

Audio level meter Rec None signal

R01

SECTION 3. TROUBLE SHOOTING FLOW CHART

3-1. 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 IC801, check FUSE and Cement resistance surely.

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 & L802

Check R802

YES

NO output Voltage

A. CHECKING THE PRIMARY CIRCUIT.

No Voltage

output

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 >> 100

YES

Check F801, L801,

L802, D802

Check the secondary

circuit

YES

Check the pattern

and T11, L12, 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

YES

B. POWER MODULE (M801) CHECK

3-2. SERVO SYSCON CIRCUIT

The voltage of pin

of IC601 is not

changed.

Is CTL pulse input

to pin IC601

Check and

re-adjust the

Path of Deck.

Check circuit

adjacent to IC601

Check C501, C502,

C503

check R636

Check IC601

YES

YESNO

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 and

HA SW applied to

HeadAmp circuit?

Check video circuit.

Auto stop during

playback

Is Reel pulse

applied to pin and

of IC601?

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

Check reel sensor.

Is D.FG applied to

pin of IC601

Check connector

D.FG circuits.

Check IC601

YES

NO NO

YES

Is Motor 12V supplied?

Is pin D.FG of

IC601 supplied.

Is pin D.PWM (pin )

of IC601 supplied?

Check connector

and Motor.

Is the input of pin

of PJ501 2V-3.5V?

Is pin of PJ50101 2.5V

Is pin (C.PWM)

of IC601 Supplied?

Check connector

and Motor

Check D606 of

power circuit.

Check C508, R510

Check IC601

Check power circuit.

Check circuit of R604,

R605, R606.

Check R655, R656

Check IC601

YES

Is Motor 12V supplied?

Drum M/T loading stops.

Capstan M/T loading stops.

Is C. Sync applied to

pin of IC601?

Check Motor.

Check C. Sync of

VIDEO IC and Pattern

Is EVER 5V supplied?

Does X601 crystal osciliate?

Is CAM SW DATA Correct?

Check IC602.

Check IC 601.

Check power circuit.

Check IC601 and X601.

Recheck connector

and CAM SW contact.

YES

Drum M/T and Capstan M/T rotate

at regular speed. (In REC mode)

Emergency mode when plugging

(Power cord)

Cassette is not

inserted.

Is Motor 12V supplied?

Check D602 of power

circuit

CAM DATA is changed

when CST IN?

Is 5V applied to

pin of IC602 when CST IN?

Chek IC602

Check connector. Check DECK part.

Is 5V supplied at

pin of IC601?

Check PATTERN

Check IC601

YES

NO NO

YES

Power compensation

does not operated.

When mains is unplugged is 3.6V at pin and of IC601?

21 64

Is signal applied to pin and of IC601?

47 48

Is 5V at pin of IC601

Check IC601

Check C602

Check x601

Check reset circuit

IC603

YES

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