Daewoo DQ-K2121N-P Service Manual

S/M No. :VKB2121NN0

Service Manual

COMBO TIMELAPSE VCR

Model : DQ-K2121N-P

✔ Caution :

In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).

DAEWOO ELECTRONICS Corp.

July. 2003

http : //svc.dwe.co.kr

SAFETY&PRECAUTIONS........................................................................................................................................2

FEATURES & SPECIFICATION................................................................................................................................4

EXTERNAL VIEWS...................................................................................................................................................8

FRONT VIEWS .......................................................................................................................................................................................8

BACK VIEWS ..........................................................................................................................................................................................9

REMOCON ............................................................................................................................................................................................10

ALIGNMENT INSTRUCTIONS................................................................................................................................11

ELECTRICAL ADJUSTMENT.................................................................................................................................12

CIRCUIT OPERATION............................................................................................................................................16

CIRCUIT INFORMATION........................................................................................................................................22

CONNECTION DIAGRAM(DQ-K2121N(D)-P).......................................................................................................................................22

POWER SCHEMATIC DIAGRAM(DQ-K2121N(D)-P) ...........................................................................................................................23

RECODER A/V SCHEMATIC DIAGRAM(DQ-K2121N(D)-P)................................................................................................................24

SERVO/SYSCON SCHEMATIC DIAGRAM(DQ-K2121N(D)-P)............................................................................................................25

FBT/CRT SCJE,ATOC DIAGRAM(DQ-K2121N(D)-P) ..........................................................................................................................26

LOGIC SCHEMATIC DIAGRAM(DQ-K2121N(D)-P) .............................................................................................................................27

JACK/AUDIO SW SCHEMATIC DIAGRAM(DQ-K2121N(D)-P) ............................................................................................................28

MULTIPLEXER SCHEMATIC DIAGRAM(DQ-K2121N(D)-P)................................................................................................................29

MONITOR A/V DIAGRAM(DQ-K2121N(D)-P).......................................................................................................................................30

TROUBLESHOOTING FLOW CHART ...................................................................................................................31

VIDEO CIRCUIT ....................................................................................................................................................................................31

SERVO-SYSCON CIRCUIT...................................................................................................................................................................35

AUDIO CIRCUIT ....................................................................................................................................................................................43

POWER PART.......................................................................................................................................................................................46

MONITOR PART....................................................................................................................................................................................47

MUX PART.............................................................................................................................................................................................48

VCT 3834 PIN ASSIGN...........................................................................................................................................50

-COM PORT DESCRIPTION ...............................................................................................................................52

COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW..............................................................................54

DISASSEMBLY .......................................................................................................................................................58

ELECTRICAL PARTS LIST.....................................................................................................................................59

14 INCH & 20 INCH DIFFERENT PARTSLIST.............................................................................................................................................................76

CONTENTS

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

SAFETY & PRECAUTIONS

SAFETY CHECK AFTER SERVING

Examine the area surrounding the repaired location for damage or deterioration. Observe that screw, parts and wires have been returned to original positions. Afterwards, perform the following tests and conform the specified values in order 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.) isgreater 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), (dÕ) between soldered terminals, and between terminals and surrounding metallic parts. See table below.

NOTE

* : Class model only

AC Line Voltage Region

Insulation

Resistance

Dielectric

Strength

Clearance

Distance(d),(d’)

100V Japan

>1M /500V DC

1kV

AC 1min.

> 3

110 to 130V

USA & Canada

- 900V AC 1min.

> 3.2

* 110 to 130V

200 to 240V

Europe

Australia

Latin America

>10M /500V DC 4kV AC 1min.

> 6(d)

> 8(d’)

(a :Power cord)

Rating for selected areas

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.

SAFETY & PRECAUTIONS

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

NOTE

Rating for selected areas

AC Line Voltage Region Load Z

Leakage Cur-

rent( i )

Clearance Distance(d),(d’)

100V Japan

1 mArms

Exposed accessible parts

110 to 130V USA &Canada

15k mF

0.5mArms Exposed accessible parts

110 to 130V 200 to 240V

Europe

Australia

0.7mA peak

2mAdc

Antenna earth terminals

50k

0.7mA peak

i <

1mAdc

Other terminals

FEATURES & SPECIFICATION

GENERAL FEATURE NTSC SYSTEM REMARK

DESTINATION NTSC : NORTH AMERICA COLOR SIGNAL NTSC : NTSC EFFECTIVE PICTURE SIZE 14Ó -> HEIGHT : 8.27Ó(21cm), WIDTH : 11.00Ó(28cm)

20Ó -> HEIGHT : 13.27Ó(34Cm) , WIDTH : 17.09Ó(43Cm) CALENDAR 2003~2102 OSD LANGUAGE ENGLISH Only LETTER COLOR WHITE BLUE BACK YES SUPER IMPOSE DATA DISPLAY YES OSD ON/OFF YES(DISPLAY KNOB) MULTIPLE INPUT YES SEQUENTIAL SWITCHER FOUR-POSITION COMPOSITE VDEO CHANNELS FROM 1 TO 4 POWER FAIL COMPENSATION ABOUT 30 DAY REAL TIME RECORD NTSC : 30Hr SET/REC LOCK YES(FRONT VIEW) REMOCON YES SAFETY REQULATION NTSC(UL, FCC)Ó POWER REQUIREMENT AC 110V-240V~, 50/60HzÓ POWER CONSUMPTION 75W WEIGHT 14Kg SET SIZE(WIDTH*HEIGHT*DEPTH)

14Ó : W387 * H403 * D373mm, 20Ó : W387 * H403 * D373mm ACCESSORY REMOCON, INSTRUCTION BOOKS, WARRANTY CARD, AD STICKER

FEATURE NTSC SYSTEM REMARK

MENU 1. Monitor Mode Set

1) Clock Set(Example : To set the color to March 13,2003 at 13:50)

- Date Fromat : (MON/DAY/YR) Month/Day/Year or Day/Month/Year <First condition :Month/Day/Year>

- 13:50:00 (HR/MIN/SEC) Time set<First condition :12:00:00>

- Thu 03/13/03 (MON/DAY/YR) Day of the Week, Month(or Day) /Day(or Month)/Year setÓ

2) Screen Display Set

- Alarm Time 01/02/03 . . . 60Sec/Off <First condition : 03Sec>

- Date/Time Yes or No <First condition : Yes>

- Title Yes or No <First condition : Yes>

- Tape Mode Yes or No <First condition : Yes>

- Alarm Counter Yes or No <First condition : Yes>

- Tape Counter Yes or No <First condition : Yes>

- Boundary Line Yes or No <First condition : Yes>

- Blank Color Blue/Gray/Black <First condition : Blue>

3) Individual Set

- TITLE A/B/C. . .Z/Blank/0/1/ . . .9 <First condition : C1>

- DWELL Off/ 01/S/02S/03S . . . 60S <First condition : 03S>

- ALARM N/O / Off / N/C <First condition : N/O>

- LOAD 75 / HI <First condition : 75>

4) Motion Set

- SENSE 01/02/03 . . . 98 <First condition : 60>

- NUMBER 01/02/03 . . . 98 <First condition : 03>

- REFERENCE 01/02/03 . . . 98 <First condition : 64>

- DETECT No/Yes <First condition : No>

- AREA set

5) Picture Set

- Brightneess 00/01/02/03 . . . 63 <First condition : 31>

- Ccontrast 00/01/02/03 . . . 63 <First condition : 31>

- Color 00/01/02/03 . . . 63 <First condition : 31>

- Sharpness 00/01/02/03 . . . 63 <First condition : 31>

- Tint (Without PAL System ) -31/-30 . . . -01/00/+01/02 . . . +31 <First condition : 00 >

note1) Sense : When saw change quantity this 01 ~ 98 of inputed Camera signal, define value of the change amount that become Motion Detect. note2)Mumber : Though some Block changes among Block that become Setting in Motion Detect Area, define if is going to decide by Motion Dttect. note3) Reference : Screen that do SenseÕs basis price that become Motion Detect to do refresh do if while is some Frame yam Refresh define.

FEATURES & SPECIFICATION

FEATURE NTSC SYSTEM REMARK

MENU 2. VCR Mode Set

1) Tape Search Select

- Alarm Search 01/02/03 . . . 99 <First condition : - -> 01/02/03 . . . 99 <First condition : - ->

- Index Serach

Forward Search Reverse Search

- Zero Search Tape Counter(Zero Search)

2) REC. Display Set <Display> <Position>

- Time No R-Bottom No/Yes R-Bottom/L-Bottom <First condition : No / R-Bottom>

- Date No R-Bottom No/Yes R-Bottom/L-Bottom <First condition : No / R-Bottom>

- Frame Cnt. No R-Bottom No/Yes R-Bottom/L-Bottom <First condition : No / R-Bottom>

- Alarm Cnt. No R-Bottom No/Yes R-Bottom/L-Bottom <First condition : No / R-Bottom>

- Tape Cnt. No L-Top No/Yes L-Top/C-Top/R-Top <First condition : No / L-Top>

- Tape Speed No L-Top No/Yes L-Top/C-Top/R-Top <First condition : No / L-Top>

3) REC Set

- Timer Rorgram Set Eight Program Memories

- Alarm REC Set Rec Speed/Duration set

- Repeat REC Set No/Yes <First condition : No>

4) Running Time 00000H Display Real Play of Drum

3. Teminal Output Set

- Alarm Out High/Low <First condition:High>

- Tape End Out High/Low <First condition:High>

- Warning Out High/Low <First condition:High>

4. Buzzer Set No/Yes <First condition: No>

5. Alarm Input Time 35th Alarm Time Memory

6. Power Loss Time 35th Power Loss Time Memory

7. Default Load No/Yes <First condition : No>

FEATURE NTSC SYSTEM REMARK

PIXELS 14Ó /20Ó : 720x480 PIXELS REAL TIME QUAD PICTURE DISPLAY YES PIP(PICTURE IN PICTURE) YES note4) 2X ZOOM WITH VERTICAL AND HORIZONTAL YES

INTERPOLATION

FULL-SCREEN DISPLAY OF ONE CAMERA YES SEQUENTIAL SWITCHER YES(FOUR-POSITION) ALARM HOLD TIME ZERO TO 60 SEC ON SCREEN DISPLAY AND PROGRAMMABLE MENU YES POWER FAIL COMPENSATION YES FREEZE CAPABILITY CAN FREEZE A PICTURE YES POWER FAIL COMPENSATION YES PROGRAM SELECTABLE BORDER LINE YES MULTI INPUT COMPOSITE VIDEO , CHANNELS FROM 1 TO 4 HORIZONTAL RESOLUTION 14Ó/ 20Ó : CENTER : 380 LINES, CORNER : 340 LINES COMB FILTER YES

- IMPROVED PICTURE QUALITY SIGNIFICANTLY

FUNCTIONS (MENU) YES TINT (Without PAL System )

- BRIGHTNESS, CONTRAST, COLOR, SHARPNESS, TINT (MENU SET)

- AUDIO VOLUME (VOLUME BUTTON)

note1) - In Menu PIP state item that do Setting be.

- PIP entry : In PIP screen if press PIP Button in C1/C2/C3/C4 relationship Full screen state entry.

- PIP cancellation : Go back PIP in Quad screen being defrosted if press Quad Button in PIP state.

- PIP action : Whenever press PIP in F1 F1_F2-> F1_S3->F1_S4->F1_Sa->F1_S2........If press C2 in F1_S2 state, Not Available.......if press F4_S2, Auto if press F3_S2,

C4 if press F2_S3, C3

- Fa_Sa: Not Available

F : Full Picture S : Sub Picture

Fa : Full Picture is SEQ.

Sa : Sub Picture is SEQ.

QUAD/MONITOR

FEATURE NTSC SYSTEM REMARK

Deck Mechanism

Head Width NTSC: RÕ:48µm, L:26µm/R:26µm, LÕ:58µm

Full Loading Yes

- Condition in Power off Unloading Stop ->Play Time About 1Sec FF->REW Time 3 min Under(T-120/E180 TAPE) Dew Sensor No Auto Head Cleaner No DLC Coated Drum Yes

Video

Video Head 4 Head Color Signal/Playback NTSC : NTSC Signal Horizontal Resolution WITH COLOR : 230 Line

Special Effect

Forward Search Speed NTSC-SP(2H) : X3, X5/ EP(6H) : X9, X15 Reverse Search Speed NTSC-SP(2H) : -1X, -X3, -X5/ EP(6H) : -1X, -X9, -X15 Still Yes Still Knob

Yes Slow Yes RMC, SET : FF/REW Variable Slow Speed Ô1/5<- 1/10<-1/15 (STILL)1/15<-1/20<-1/30

Syscon Tape Speed on Play NTSC SYSTEM

Tape Speed on Record : 002/006/018/030/048/072/096/120/168/240/360/480/720/960 Audio Recording NTSC SYSTEM : 002/006/018/030H Real Time Recording Fields NTSC: 20.0Fields/sec (18Hour Mode/T-120 Tape) Auto Clear Time

Manual Clear

No(Sensor)

Manual Tracking In the Panel : TRK -/+ Knob common used

Remocon : TRK +/- Knob common used

Counter Reset Yes(Clear Knob)

Syscon Counter Zero Search Yes

Auto Operation

- Auto power on & go No

- Auto power on by cassette-in Yes

- Eject is working in VCR OFF Yes

- Eject is working in monitor OFF No

Auto Play No

Timer

Events 8Events(MENU SET) Running Time Display Yes(MENU SET) The Play time of DRUM Running Time Reset Press the POWER+TIMER Key during 3secs simultaneously. In case of No tape status Buzzer Setting Yes(MENU SET) Language Setting NTSC System : No Error Display Clear with the TIMER Knob OSD Display

- In case of Tape in/out is not possible. E-01 If Input the TIMER KEY when cancel ERROR

- In case of playing of Tape is not possible. E-02 state, and VCR is the POWER OFF Mode.

- In case of playing of Drum is nor possible. E-03

- In case of the cut of Tape E-04

Select the Buzzer On/Off According to the buzzer setting status, it is to be On/Off

: In case of tape in without Tap : In case of pressing the REC Knob In case of On (About 5times ring) : In case of pressing the Timer Knob In case of On (About 5times ring)

-Tape Out in the T.REC wating MODE In case of On (About 5times ring)

- Input the Alarm signal during REC & STOP

- Input the Alarm signal, in the (Tape Out/Tape In without Tap tape )

Buzzer always OFF status No matter what Buzzer Setting, always OFF status

- When the Tape ending point , during REC. Always Off status upkeep

Tape Eject -> VCR Power Off

Buzzer always ON status No matter what Buzzer Setting, always ON status

Error status If TIMER Key is pressed, Buzzer

- In case of Tape in/out is not possible. operate.Clear the ring.

- In case of playing of Tape is not possible. If Input the TIMER KEY when cancel ERROR

- In case of playing of Drum is nor possible. state, and VCR is the POWER OFF Mode.

- In case of the cut of Tape

FEATURES & SPECIFICATION

RECORDER

FEATURES & SPECIFICATION

FEATURE NTSC SYSTEM REMARK

Timer Auto Series Record no

Auto Repeat Record Yes(MENU SET) Alarm Search Yes(MENU SET) Clock Display Method 24Hours Timer Recording System Yes With the Timer Key Alarm Recording System Yes(When the Stop Key is clear immediately)

NTSC SYSTEM : 02/06/18/30H Repeat Recording System Yes(MENU SET) Series Recording System No REC Check Yes Slow screen for 5secs Daily Programming Yes(Sunday~Saturday) (daily REC) Weekly Programming Yes Program Setting Yes(MENU SET)

TIMER,MENU,Shift,Set +,Program Cancel Yes(MENU SET) Program Review Yes(MENU SET) Alarm Memory Review Yes(MENU SET) Power Failure Review Yes(MENU SET) Start Time on Recording On Time Throuth Output of EE Input NO

Automatic Restart of Recording Yes

In Case of T-REC Overlap End Time Priority Manual Clear Knob in T-REC Stop Knob

EXTERNAL VIEWS

1. FRONT VIEWS

No SW Name SW Type LED color No SW Name SW Type LED color

1 REMOTE SENSOR - - 17 SPEAKER - 2 STANDBY/ON SW+LED RED 18 SET LOCK Slide sw 3

VOLUME

SW only - 19

VOLUME

SW only 4 ALARM ON/OFF SW+LED RED 20 AUDIO SEL/MUTE (note2) SW+LED RED 5 MIC - - 21 AUTO SW+LED RED 6 CLEAR/DISPLAY (note1) SW only - 22 QUAD/P.B THROUGH SW+LED RED 7 ZOOM SW+LED RED 23

C1 / / SHIFT

SW+LED RED

8 FREEZE SW+LED RED 24

C2 / ))

SW+LED RED

9 PIP/TRK- SW+LED RED 25

C3 / / SET -

SW+LED RED

10 MENU/TRK+ SW only - 26

C4 /

SW+LED RED 11 STOP/EJECT SW only - 27 REW SW+LED RED 12 PAUSE/STILL SW+LED RED 28 PLAY SW+LED RED 13 LED(REPEAT REC) LED RED 29 FF SW+LED RED 14

REC/PLAY SPEED

SW only - 30

REC/PLAY SPEED

SW only 15 REC/REC CHECK SW+LED RED 31 TIMER SW+LED RED 16 LED(CST IN) LED RED 32 TALK SW+LED RED

F/L Door

19 32

STANDBY/ON

SET LOCK

VOL

3 4

ALARM

AUDIO/

MUTE

7 8 9 10

1211 15

24 25 26

29 30 31

AUTO

QUAD/

P.B THROUGH

CLEAR/

DISPLAY

ZOOM

C1 /

SHIFT

FREEZE

C2 /

SHIFT

PIP/

TRK-

C3 / /

SET -

MENU/

TRK+

C4 / /

SET +

STOP

/EJECT

REW

PAUSE/

STILL

PLAY

FF SPEED

SPEED

R.REC

TIMER

REC/

REC CHECK

MIC

TALK

OFF

/ SHIFT

-Note 1 : Input th Ò CLEAR/DISPLAY KEYÓ over 3sec. It mode ÒDISPLAY MODEÓ.

-Note 2 : ÒAUDIO SEL/MUTE KEYÓ over 3sec. It mode Ò MUTE MODEÓ.

EXTERNAL VIEWS

2. BACK VIEWS

AUDIO MONITOR

VIDEO

DIN

AUDIO

INPUT RESET

OFF

POWER

CH 1 CH 2 CH 3 CH 4

WARNING

OUT

TAPE END

IN 1OUT

COMCOMCOMCOMCOMCOM

IN 2 IN 3 IN 4

ALARM

OUT

Terminal 1) N.C. 2) N.C.

AUDIO IN (CH1~CH4, rca type)

3) WARNING OUT 4) COM

VIDEO IN(CH1~CH4, bnc type)

5) TAPE END 6) COM

6 PIN MINI DIN(FOR SVC SPEC)

7) ALARM OUT 8) COM

DC 12V OUTPUT AUDIO OUTPUT

9) ALARM1 IN 10) COM AUDIO INPUT VIDEO INPUT

11) ALARM2 IN 12) COM TALK 12V OUTPU GND

13) ALARM3 IN 14) COM N.C

15) ALARM4 IN

RESET SW

AUDIO OUT (rca type)

MAIN POWER SW

MONITOR(VIDEO) OUT (rca type) AC POWER INPUT CORD

RS232C(optional/without SVC Model)

d e

g h

i j

b c

3. REMOCON

e.20"/14" T/L REMOCON KEY

USER REMOCON SVC MODE BY USER REMOCON

NO KEY CODE KEY NAME

CUSTOM DATA

* SVC MODE

1 15H 00 VOL UP/SHIFT ¡

1.POWER ON(EJECT)

2 15H 01 VOL DN/SHIFT ¢„

2.Make full screen

3 15H 02 REC/PLAY SPEED ¡ª

in CAM4.

4 15H 03 REC/PLAY SPEED ¡

3.Push "INDEX -, +,

5 15H 04 SET +

ALARM -, +" buttons

6 15H 05 SET -

in sequence within

7 15H 06 C1

10 seconds.

8 15H 07 C2

4.Press the POWER OFF key

9 15H 08 TIMER

to release SVC MODE.

10 1 5H 09 C3 11 15H 0D STOP 12 15H 0E PLAY 13 15H 0F FF 14 15H 10 REW 15 15H 11 PAUSE/STILL 16 1 5H 12 REC 17 15H 13 AUTO 18 15H 15 POWER

19 1 5H 16 PI P 20 15H 17 AUDIO SEL 21 15H 18 ALARM 22 15 H 19 TALK 23 15H 1A AUDIO ON 24 15H 1B REC CHECK 25 15H 1D DISPLAY 26 15H 1E QUAD 27 15H 1F GOTO 0 28 15H 21 EJECT 29 1 5H 22 MENU 30 15H 27 C4 31 15H 29 ZOOM 32 15H 31 ALARM 33 15H 33 INDEX + 34 15H 35 ALARM + 35 15H 36 CLEAR 36 15H 39 FREEZE 37 15H 3F INDEX -

EXTERNAL VIEWS

ALIGMENT INSTRUCTIONS

1. VCR DECK ADJUSTMENTS

1) X-DISTANCE & P2,P3 ADJUSTMENT(S10)

¥ Connect Path JIG to connector PS 04, Playback the test tape(DN-2,7KHz)

¥ Connect oscilloscope CH1 to V.SW(PS04#2), CH2 to PB RF(PS04 #1) and trigger on CH1.

¥ Enter the service mode and select service adjustment S10

¥ Use the VOL up button to set ATK Off CEN.

¥ Turn the X-distance screw to maximum of PB-RF.

¥ Use the VOL up button to set ATK Off MIN and MAX.

¥ If PB-RF is not smooth, adjust P2, P3.

✰ P2, P3

VH SW

2) P.G ADJUSTMENT(S11)

¥ Playback the test tape(DN-2, 7KHz)

¥ Enter the service mode and select service adjustment S11

¥ Push the Ò RECÓ KEY once, P.G Adjustement is Automatically.

¥ Connect oscilloscope CH1 to V/SW(PS04#2), CH2 to CVS(PS04 #50 and trigger on CH1, Confirm The P.G is 6.5H(412msec).

3) AUDIO AZIMUTH ADJUSTMENT

¥ Playback the test tape(DN-2, 7KHz)

¥ Connect oscilloscope and level meter to Aout(PS04 #4).

¥ Turn the azimuth screw to maximum 7KHz level.

4) FACTORY OUTGOING MODE(S12)

¥ If you select the S12, then the set becomes factory outgoing status.

¥ You can see the channel to Ò O2Ó or if the set playback you can see the OSD ÒAUTO TRACKINGÓ.

ELECTRICAL ADJUSTMENT

Electrical adjustments: Alignment and electrical adjustment

- For these adjustments, use the equipment mentioned below and proceed by using the alignment tape and video signal.

¥ Instrument and tools required

1. Color TV .

2. Oscilloscope having 10MHz or more bandwidth.

3. Color-bar generator.

¥ Signal level and input and output impedance requirement

1. video intput : Negative sync 1Vp-p standard composite video signal, 75?.

2. Video output : Same as above.

3. Audio input : Line ?8.8dBm 47K? Min.

4. Audio output : -6dBm 10K? Max.

¥ Adjustment sequence

The VCR should be adjusted in the sequence shown below.

horizontal sync

burst

0.714V

0.286V

1Vpp

COLOR BAR SIGNAL WAVEFORM

COMBO

VCR DECK PATH VCR SERVO MONITOR

Adjustment

% W

i t

Y e

l o w

C y a n

100

White

Black

r e e n

a g e n

R e d

l u e

ELECTRICAL ADJUSTMENT

1. SERVO/SYSCON CIRCUIT ADJUSTMENT METHOD

(1) VIDEO HEAD SWITCHING POSITION

Adjustment Part Checking Point Measuring Equipment Mode Test Tape R595 TJ396P502 3PIN Oscilloscope Play DN-1(Color Bar)

¥ Connection Method

¥ Adjustment Procedure

1) Play back the test tape.

2) Set the oscilloscope in the chop mode connect the CH1 to SW pulse(P502 3PIN), the CH2 to TJ396(video out) with CH1 triggering.

3) Adjust R595 for the positive trigger until 6.5?0.5H cycle before the vertical SYNC pulse.

R595

P502

TJ396

CH-2 Oscilloscope CH-1

CH2

CH1

Trigger Position

6.5H 0.5H

0.5H

Vertical SYNC

Signal

SW PULSE

(PT502 3PIN)

VIDEO OUT

(TJ396)

–

2 . MONITOR ADJUSTMENT

* HOW TO ENTER THE SVC MODE

1) POWER ON(EJECT MODE) and make full screen in CAM4.

2) Push INDEX-,+,ALARM-,+ buttons in sequence within 10 seconds. Then, the screen will display FACTORY V0.1 text on the upper of the reft.

2-1 The adjustment of screen

1) Press the VOL UP, DOWN(S-BRIGHT +,-) key on the remote control to set the sub-bright. ( Setting data Ñ Philips CRT : 30 , Thomson CRT : ? , SAMSUNG CRT : ? )

In case of mass production in the factory, keeping the setting data value to EEPROM MASTER IC for setting of sub-bright

2)Press the EJECT(SCREEN) key on the remote control so that make the horizontal line.

3)Adjust the screen volume of the FBT so that the horizontal line may be minimum light.

4)Press the EJECT(SCREEN) key on the remote control to release SCREEN mode.

2-2 The adjustment of focus

1) Apply NTSC RETMA pattern.

2) Call up the SVC Mode and make full screen in C4.

3) Adjust with the focus volume on the FBT until you get the most clear resolution line on the screen.

2-3 The adjustment of white balance

1) Call up the SVC Mode.

2) Adjust with ALARM,AUDIO SEL, ALARM-,+(G BIAS +/-,B BIAS +/-) keys so that only G,B bars in the high beam on

the instrument

3) Adjust with GOTO,CLEAR,REC/PLAY UP,DOWN (G DVR +/-,B DVR +/-) keys so that only G,B bars in the low beam

on the instrument may be located in the center.

4) The reference coordinates are X=288,Y=301

2-4 The adjustment of geometry

2-4-1 The adjustment of vertical center

1) Apply NTSC RETMA pattern.

2) Call up the SVC Mode and make full screen in C4.

3) Press QUAD, AUTO(V-CEN+ or V-CEN-) key and VERT CENT OSD will be displayed.

4) Adjust with QUAD,AUTO(V-CEN+/V-CEN-) keys so that the center mark of the CRT may be located on the

horizontal line in the middle of the pattern. In case of no center mark, adjust with QUAD, AUTO(V-CEN+/V-CEN-)

keys to obtain a vertically symmetrical pattern.

2-4-2 The adjustment of vertical size

1) Apply NTSC RETMA pattern.

2) Call up the SVC Mode and make full screen in C4

3) Press MENU,PIP(V-SIZE+ or V-SIZE-) key and VERT SIZE OSD will be displayed.

4) Adjust with MENU,PIP(V-SIZE+/V-SIZE-) keys so that the upper and the lower Ô+Õ marks of the RETMA pattern may be located at the boundaries of the screen.

ELECTRICAL ADJUSTMENT

2-4-2 The adjustment of vertical size

1) Apply NTSC RETMA pattern.

2) Call up the SVC Mode and make full screen in C4

3) Press MENU,PIP(V-SIZE+ or V-SIZE-) key and VERT SIZE OSD will be displayed.

4) Adjust with MENU,PIP(V-SIZE+/V-SIZE-) keys so that the upper and the lower Ô+Õ marks of the RETMA pattern may be located at the boundaries of the screen.

2-4-3 The adjustment of vertical slope

1) Apply NTSC RETMA pattern.

2) Call up the SVC Mode and make full screen in C4.

3) Press C1,C2(V-SLOPE+ or V-SLOPE-) key and V. LINEAR OSD will be displayed.

4) Referring to the upper side and lower side, adjust with C1,C2(V-SLOPE+/V-SLOPE-) keys so that RETMA pattern may be symmetrical.

5) In case of mass production in the factory, keeping the default value is recommended for the adjustment of V-SLOPE. DEFAULT : -00003, Default value : -00003

2-4-4 The adjustment of horizontal center

1) Apply NTSC RETMA pattern.

2) Call up the SVC Mode and make full screen in C4.

3) Press ZOOM, FREEZ(H-CENTER+/H-CENTER-) key and HOR CEN OSD will be displayed.

4) Referring to the both side scales, adjust with ZOOM, FREEZ(H-CENTER+/H-CENTER-) keys so that RETMA pattern may be symmetrical.

CIRCUIT OPERATION

1. VIDEO PART

1-1) EE MODE

Video Signal which is output from monitor is input into pin 36 of IC301. It is amplified 6dB by AGC, then it is output to pin 29 of IC301. The output signal is output to monitor through PJ301..

1-2) REC MODE

Video signal inputted from monitor will be recorded on the tape through head after FM modulated in IC.

1-3) PB MODE

FM signal pick uped through drum head from tape output to the pin 29 of IC301 as composite video signal after

60dB amplified and demodulation, then output to monitor through u-com OSD.

V-IN

V-OUT

REC

AV SW JACK

Multiplexer

part

Servo Syscon u-com OSD

MONITOR

PART

VIDEO

PART

CIRCUIT OPERATION

2. AUDIO PART

2-1) EE MODE

External AUDIO signal which is input to pin 78 of IC301 is output from pin 96 of IC301 after being ampli-fied through ALC and Line Amp.

2-2) REC MODE

It will be the REC mode when REC 5V is input to base of Q206,Q202. Input signal will be replaced on the tape through R/P HEAD after being amplified and modulated with Bias Frequency. Input signal is ampli-fied and frequency compensated by REC AMP, ie. it means high band compensation in order to match AUDIO HEAD characteristic. Each modeÕ s peaking frequency will be determined by BIAS element (R, L, C) of REC AMP. OSC oscillation frequency is 70KHz sinewave, it will be used for tapeÕ s full erasing and AUDIO TRACK erasing.

2-3) PB MODE

The signal which is picked up from AUDIO HEAD is input to EQ AMP, then constant Audio Level will be output by PB LEVEL fixed resistor after each mode is amplified and frequency is compensated.18H AUDIO output level will be compensated with receiving Audio 24H(H) control of u-COM. Finally this out-put signal is output through AUDIO conrol switching IC942, IC943.

CIRCUIT OPERATION

3. SYSTEM PART

3-1) System Block DIAGRAM

CRT & DY COIL

Terminal Jack

PART

FBT

& High

Volt price

PART

DECK K

MECH K-30

VCR Servo

Syscon . OSC

PART

Monitor

u-com IC

Multiplexer

Part

Front KEY Matrix

Power PART

Coil Degauss

CIRCUIT OPERATION

3-2) TIME LAPSE RECORDING METHOD

The numbers of VHS 2HOUR (SP), 6HOUR (EP) REC FIELD are 60 field/sec, then it will be 1FRAME = 33.3Ms, 1FIELD = 16.65Ms. CAPSTAN MOTOR FG numbers for Time Lapse are 6HOUR(EP) = 720 numbers/sec, 2HOUR(SP) = 720*3=2160 numbers/sec.

¥ u-COM controls capstan motor (C I LIMIT) with capstan motor FG numbers. DRUM HEAD ON/OFF controlled by

HEAD AMP SW & REC mute signal.

¥ u-COM controls capstan motor (C I LIMIT) with capstan motor FG numbers. DRUM HEAD ON/OFF controlled by

HEAD AMP SW & REC mute signal.

LRLRLRLRLRLRL

16.65ms

18H(EP) RECORDING (20FIELD/SEC) 2H & 6H (60FIELD/SEC)

LRLRL

33.3ms

18H (20FIELD/SEC) : Recording 1 field per 3 fields

(Capstan FG numbers are ; 1SEC:720=33.3ms:X X=24)

(Capstan FG numbers are ; 1SEC:720=16.65ms:X X=12)

LRLRLRLRLRLRL

16.65ms

24H(SP) RECORDING (5FIELD/SEC) : recording 1 field per 12 fields

16.65ms*10=166.6ms

18H (20FIELD/SEC) : Recording 1 field per 3 fields

(Capstan FG numbers are ; 1SEC:2160=166.6ms:X X=36)

(Capstan FG numbers are ; 1SEC:720=16.65ms:X X=12)

CIRCUIT OPERATION

3-3) TERMINAL PART

ALARM INPUT 1,2,3,4

Connect DOOR SW&SENSOR etc and this port will be used for emergency recording by using open/ close status.

TAPE END OUT

When the recording tape ends during recording, end sensor will be detected. This port is used Alarm to outsider until release the end sensor detecting.

WARNING OUTPUT

This port is used to inform emergency status of Time Lapse VCR Set to outsider.

500ms

N/O(NORMALY OPEN)

N/C(NORMALY CLOSED)

END Detect

HIGH

EMERGENCY

status term

HIGH

CIRCUIT OPERATION

X-RAY PROTECTION CIRCUIT(DQ-K2121N-P)

CIRCUIT INFORMATION

1. CONNECTION DIAGRAM(DQ-K2121N(D)-P)

CIRCUIT INFORMATION

2. POWER SCHEMATIC DIAGRAM(DQ-K2121N(D)-P)

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Daewoo DQ-K2121N-P Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual