Daewoo DQ-K2121N-P User 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

1
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
µ-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
2
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.
3
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 1k
i < 1 mArms Exposed accessible parts
110 to 130V USA &Canada 15k mF
1k
i < 0.5mArms Exposed accessible parts
110 to 130V
200 to 240V Europe Australia 2k
i < 0.7mA peak
i < 2mAdc Antenna earth terminals
50k
i < 0.7mA peak
i < 1mAdc Other terminals

4
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
<First condition :01/01/03>
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.

5
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
6
FEATURES & SPECIFICATION
RECORDER

7
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

8
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 -
3VOLUME 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
17
2
19 32
STANDBY/ON
SET LOCK
VOL
VOL
3 4
20
ALARM
AUDIO/
MUTE
678 910 1211 15
23
21 22 24 25 26 27 28 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
14
TIMER
REC/
REC CHECK
MIC
TALK
OFF
ON
1
18
5
/ SHIFT
13
-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.

9
EXTERNAL VIEWS
2. BACK VIEWS
AUDIO MONITOR
VIDEO
DIN
AUDIO
INPUT RESET
ON
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)
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