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

Service Manual

MODEL : 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

=

DV-K10W

BLUE DIAMOND II #

NTSC PLAY BACK ON PAL TV

POWER

				FF
CASSETTE IN REW	PLAY	FF	RECORD	PLAY
STOP/EJECT

REW

INFRARED

REMOTE SENSOR

DAEWOO ELECTRONICS CO., LTD.

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
Maximum recording time	video cassette
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.

d

Primary circuit termimals

d'

Chassis

a

Table 1: Rating for selected areas				Fig. 1
	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')
					(a: Power cord)

* 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)						Exposed
							accessible
	Insert load Z between B (earth ground, power cord plug								AC Voltmter
							part	Z
	prongs) and exposed accesible parts. Use and AC								(high impedance)
	voltmeter to measure across both terminals of load Z.							Earth Ground
	See figure 2 and following table.
								B power cord plug prongs
	Table 2: Leakage current ratings for selected areas							Fig. 2
	AC Line Voltage		Region		Load Z		Leakage Current (i)		Earth Ground
									(B) to:
	100V		Japan				¡ ≤ 1m A rms		Exposed accessible
					1k				parts
	110 to 130 V		USA &		1.5kµF		¡ ≤ 0.5 m A rms		Exposed accessible
					1.5k				parts
							¡ ≤ 0.7 m A peak		Antenna earth
	110 to 130 V		Europe		2k			¡ ≤ 2 m A dc	terminals
	200 to 240 V		Australia				¡ ≤ 0.7 m A peak		Other terminals
					50k			¡ ≤ 2 m A dc

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

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. WAVEFORMS 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 LOCATION 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 PARTS LIST..................................................................................................................	36
SECTION 10. OPTION TABLE......................................................................................................................................	43

1

SECTION 1. CONTROLS AND FUNCTIONS

FRONT

DV-K10W

=

DV-K10W

BLUE DIAMOND II #

NTSC PLAY BACK ON PAL TV

POWER

				FF
CASSETTE IN REW	PLAY	FF	RECORD	PLAY
STOP/EJECT

REW

INFRARED

REMOTE SENSOR

DV-K12W

=

DV-K12W

		BLUE DIAMOND II #
		NTSC PLAY BACK ON PAL TV
POWER	STOP/EJECT	REW
		PLAY
			CST IN	FF	REC
		REW

REAR

RF OUT

CH.H CH.L

EURO-AV

K

ANT. IN

G

ON TEST

OFF

			RF OUT
	CH.H CH.L		VIDEO AUDIO
	K		IN
			ANT. IN
	G	TEST	OUT
	ON
	OFF

2

SECTION 2. ELECTRICAL ADJUSTMENT

2-1. SERVO CIRCUIT ADJUSTMENT METHOD

1. VIDEO HEAD SWITCHING POSITION

Adjustment Parts		Checking Point	Measuring Equipment	Mode	Test Tape
R592		R307	Oscilloscope	PLAY	DP-2
		PT01 PIN ¤Ø
• Connection Method
• Adjustment Procedure

Modulator

P S

O M

R307 W P

E S

R

PT01 PIN3

DECK

R592

CH-1

OSCILLOSCOPE

CH-2

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.

CH1		SW 30Hz
		(PT01	3	PIN)
		VERTICAL SYNC
CH2
	1H	(R307)
		0.5H
		6.5H ± 0.5H
	TRIGGER

3

2-2. AUDIO CIRCUIT ADJUSTMENT METHOD

1. AUDIO RECORD BIAS

	Adjustment Parts	Checking Point	Measuring Equipment	Test Tape	Input Signal
	R292	A/C Head PCB	Audio level meter	Rec	None signal
		R01
	• Connection Method

P S

O M

R292 W P

E S

R

DECK ASSY

A/C HEAD

• 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.

Audio LEVEL METER

+

–

A/CHEAD

R101

4

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 KΩ resistance)

•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.

A. CHECKING THE PRIMARY CIRCUIT.

	NO output Voltage
	YES
	Prepare the instrument
	connecting the insulating trans.
	YES
	Check F801 FUSE
	YES
		NO
	Is voltage applied to D801?		Check D801, L801 & L802
	YES
		NO
	Is voltage applied to the		Check R802
	both terminals of C807?
	YES
	Check power module

5

B. POWER MODULE (M801) CHECK

No Voltage

output

Is voltage supplied

Via CN11?

YES

The voltage of #1 of

IC11 is 5.7V and stable

NO

The voltage of #1 of IC11 fluctuate

in 4.8V~5.7V

YES

Measure resistance between GND of CN21 and each terminal

of CN21

Resistance >> 100

The 12DC of each wire of T11 is ok

YES

Primary parts is ok

YES

Secondary parts ok

NO	Check F801, L801,
	L802, D802

YES	Check the secondary
	circuit

NO	Check the pattern
	and T11, L12, IC11

	Terminal open and		The voltage	NO		Check the
	measure the output					parts outside
			is ok
	Voltage					module
			YES
NO
	Change T11		Check the Diode,
			Condenser inside
			Module

NO	Change parts
	out of order

NO	Change parts
	out of order

6

3-2. SERVO SYSCON CIRCUIT

A.

Playback picture is not good.

	Noise appears		NO
				Adjust
although adjusting				tracking
	tracking.
	YES
Noise shakes up			NO	Noise appears
	and down on the			although change
	screen.			cassette tape.
	YES
	Is CTL pulse out		NO	CTL HEAD height is
from pin 20 of IC601.				normal and there is
				not dust.
	YES			YES
Is CTL pulse input			NO	Check C501, C502,
	to pin 7 IC601			C503
	YES
The voltage of pin
			NO	check R636
	56 of IC601 is not
	changed.
	YES
	Check IC601

YES	Check and
	re-adjust the
	Path of Deck.

NO	Adjust the HEAD
	height and remove
	dust

Check circuit adjacent to IC601

7

B.

Playback picture is not good.

YES

Noise appears on the screen on the whole.

YES

Are SW pulse and

HA SW applied to

HeadAmp circuit?

YES

Is Enve.wavefrom supplied to at pin 4 of

PT01

YES

Check video circuit.

C.

Auto stop during playback

YES

NO	Check flow A

NO	Is SW pulse supplied		NO	Check D.PG input
	from pin 23 of IC601?			and connector.
	YES
NO
	Check pattern

	Check connector, Head	NO
			Change head
	Amp and Head dust.

	Is Reel pulse	NO
			Check reel sensor.
	applied to pin 7 and
	14 of IC601?
	YES

Is D.FG applied to	NO	Check connector
pin 17 of IC601		D.FG circuits.

YES

Check IC601

8

D.

Drum M/T loading stops.

NO

Is Motor 12V supplied?

YES
	NO
Is pin 17 D.FG of
IC601 supplied.
YES
	NO
Is pin D.PWM (pin 30 )
of IC601 supplied?
YES
Check connector
and Motor.

E.

Capstan M/T loading stops.

	YES
		NO
	Is Motor 12V supplied?
	YES
		NO
	Is the input of pin 6
	of PJ501 2V-3.5V?
	YES
		NO
	Is pin 4 of PJ50101 2.5V
	YES
		NO
	Is pin 31 (C.PWM)
	of IC601 Supplied?
	YES
	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

9

F.

Drum M/T and Capstan M/T rotate at regular speed. (In REC mode)

NO
	NO
Is C. Sync applied to		Check C. Sync of
pin 8 of IC601?		VIDEO IC and Pattern

YES

Check Motor.

G.

Emergency mode when plugging (Power cord)

Is EVER 5V supplied?	NO		Check power circuit.
YES
	NO
Does X601 crystal osciliate?			Check IC601 and X601.
YES
	NO
Is CAM SW DATA Correct?			Recheck connector
			and CAM SW contact.
YES

Check IC602.

YES

Check IC 601.

10

H.

Cassette is not inserted.

Is Motor 12V supplied?

YES

CAM DATA is changed when CST IN?

YES

Is 5V applied to

pin 4 of IC602 when CST IN?

YES

Chek IC602

NO	Check D602 of power
	circuit

NO	Check connector.	NO	Check DECK part.

NO	Is 5V supplied at	NO	Check PATTERN
	pin 37 of IC601?
	YES
	Check IC601

11

I.

Power compensation does not operated.

When mains is unplugged is 3.6V at pin 21 and 64 of IC601?

YES

Issignal applied to pin 47 and 48 of IC601?

YES

Is 5V at pin 46 of IC601

YES

Check IC601

NO	Check C602

NO

Check x601

NO	Check reset circuit
	IC603

12