Daewoo DV-K580DZ-T User manual

Service Manual
S/M No. :VK580PAEF0
Aug.2000
DAEWOO ELECTRONICS CO., LTD.
http ://svc.dwe.co.kr
TIME LAPSEVCR
Model: DV-K580DZ-T

1
TABLE OF CONTENTS
SAFETY & PRECAUTIONS ............................................................................................. 2
EXTERNAL VIEWS ........................................................................................................ 4
FRONT VIEWS FUNCTION ...................................................................................................................4
REAR VIEWS FUNCTION .....................................................................................................................5
ELECTRICAL ADJUSTMENT ........................................................................................... 6
SPECIFICATIONS ....................................................................................................... 12
TIMELAPSE REC/PB SPEED CHART ................................................................................ 13
CIRCUIT OPERATION .................................................................................................. 14
VOLTAGE CHART ....................................................................................................... 22
CIRCUIT DIAGRAM ..................................................................................................... 28
CONNECTION DIAGRAM ..................................................................................................................28
POWER CIRCUIT DIAGRAM ................................................................................................................29
SYSCON CIRCUIT DIAGRAM ..............................................................................................................30
VIDEO CIRCUIT DIAGRAM .................................................................................................................31
PRE-AMP CIRCUIT DIAGRAM .............................................................................................................32
OSD CIRCUIT DIAGRAM ....................................................................................................................33
AUDIO CIRCUIT DIAGRAM .................................................................................................................34
LOGIC CIRCUIT DIAGRAM .................................................................................................................35
TERMINAL CIRCUIT DIAGRAM ............................................................................................................36
COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW ........................................... 37
PCB MAIN .........................................................................................................................................37
PCB UNION .......................................................................................................................................38
DISASSEMBLY ............................................................................................................. 39
PANEL FRONT ASS’Y ...........................................................................................................................39
SET TOTAL ASS’Y .................................................................................................................................40
PACKING ASS’Y .................................................................................................................................41
ELECTRICAL PARTS LIST ............................................................................................... 42
TROUBLE SHOOTING FLOW CHART ............................................................................. 1
POWER CIRCUIT ................................................................................................................................1
SERVO-SYSCON CIRCUIT ...................................................................................................................3
VIDEO CIRCUIT .................................................................................................................................11
AUDIO CIRCUIT .................................................................................................................................15
u-COM PORT DESCRIPTION ....................................................................................... 18
APPENDIX(Appendix is provided only by internet http://svc.dwe.co.kr)

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 con-
form the specified values in order to verify compliance with 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, micro-
phone jacks, earphone jacks, etc.)
is greater 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), (d’) between sol-
dered terminals, and between terminals and surrounding metallic parts. See table below.
Rating for selected areas
* : Class model only
AC Line Voltage Region Insulation
Resistance Dielectric Strength Clearance Distance(d),(d')
100V Japan ] 1MΩ/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 ] 10MΩ/500V DC 4kV AC 1min. ]6(d)
]8(d')
(a :Power cord)
This table is unofficial and for reference only. Be sure to confirm the precise values for your particular
NOTE

3
SAFETY & PRECAUTIONS
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 termi-
nals, 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.
Leakage current ratings for selected are as
AC Line Voltage Region Load Z Leakage Current( i )Clearance Distance(d),(d’)
100V Japan 1kΩi*1mArms Exposed accessible parts
110 to 130V USA &Can-
ada 15kµF
1kΩi*0.5mArms Exposed accessible parts
110 to 130V
200 to 240V Europe Australia 2kΩi*0.7mA peak
i*2mAdc Antenna earth terminals
50kΩi*0.7mA peak
i*1mAdc Other terminals
This table is unofficial and for reference only. Be sure to confirm the precise values
for your particular country and locality.
NOTE

4
1. FRONT VIEWS FUNCTION
EXTERNAL VIEWS
1)STOP button
2)REC button
3)REC CHECK button
4)EJECT button
5)CASSETTE LOADING DOOR
6)DISPLAY PANEL
7)PLAY button
8)REW button
9)FF button
10)PAUSE/STILL button
11)REMOTE SENSOR
12)REMOCON LOCK SWITCH
13)SET LOCK SWITCH
14)RESET button
15)MENU button
16)SHIFT( t) / TRACKING (-) button
17)SHIFT( U) / TRACKING (-) button
18)REC/PLAY SPEED (-) button (SET - button)
19)REC/PLAY SPEED (+) button (SET + button)
20)AUDIO ON button
21)DISPLAY button
22)POWER (TIMER ) button
23)COUNTER button
24)CLEAR button

5
EXTERNAL VIEWS
2. REAR VIEWS FUNCTION
1)AC POWER CORD
2)WARNING OUT terminal
3)SERIES IN terminal
4)COM terminal
5)SERIES OUT terminal
6)SW OUT terminal
7)VIDEO OUT jack
8)VIDEO IN jack
9)AUDIO IN jack
10)TAPE END terminal
11)PANIC IN terminal
12)COM terminal
13)ALARM OUT terminal
14)ALARM IN terminal
15)MIC (microphone input) jack
16)AUDIO OUT jack

6
ELECTRICAL ADJUSTMENT
1. SERVO/SYSCON CIRCUIT ADJUSTMENT METHOD
v VIDEO HEAD SWITCHING POSITION
v CONNECTION METHOD
v ADJUSTMENT PROCEDURE
1) Play back the test tape.
2) Set the oscilloscope in the chop mode connect the CH1 to SW pulse(PT501 (r)PIN), 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.
Adjustment Part Checking Point Measuring Equipment Mode Test Tape
R595 TJ396
PT501 PIN3 OSCILLOSCOPE Play DN-1 (Color Bar)
TJ396
CH-1
Oscilloscope
CH-2
PT501 R595
CH1 SW PULSE
(PT501 3PIN)
VIDEO OUT
(TJ396)
Vertical SYNC Signal
1H
6.5H 0.5H
Trigger Position

7
ELECTRICAL ADJUSTMENT
2. VIDEO CIRCUIT ADJUSTMENT METHOD
(1) EE LEVEL
v CONNECTION METHOD
v ADJUSTMENT PROCEDURE
1) Supply the Color Bar Signal to the VIDEO
IN JACK, and set the VCR to the STOP
mode.
2) Connect the oscilloscope to TJ396 and
trigger the scope with a composite sync
signal at TJ302.
3) Adjust R395 to obtain 2.0Vp-p ±0.2Vp-p
between the SYNC Tip and 100% white
level
Adjustment Parts Checking Point Measuring Equipment Test Tape Input Signal
R395 TJ396 Signal Gen. Oscilloscope -Color Bar
2.0V 0.2Vp-p
TJ395
Horizontal :10 s/div
Vertical :0.1V/div
EE
TJ302
CH-1
Oscilloscope
CH-2
SIGNAL
GENERATOR
TJ396
R395

8
ELECTRICAL ADJUSTMENT
(2) PLAYBACK Y-SIGNAL OUTPUT LEVEL
v CONNECTION METHOD
v ADJUSTMENT PROCEDURE
1) Playback the COLOR BAR Test tape (DP-1).
2) Connect the oscilloscope to TJ396 and trigger the scope with a composite sync signal at TJ302.
3) Adjust R396 to obtain 2.0 ±0.2Vp-p between the SYNC TIP and 100% white peak level.
Adjustment Parts Checking Point Measuring Equipment Test Tape Input Signal
R396 TJ396 Oscilloscope DP-1 -
TJ302
CH-1
Oscilloscope
CH-2
TJ396
R396
PB-Y
2.0V 0.2Vp-p
TJ396
Horizontal :10 s/div
Vertical :0.5V/div

9
ELECTRICAL ADJUSTMENT
(3) SYNC TIP FREQUENCY
v CONNECTION METHOD
v ADJUSTMENT PROCEDURE
1) Set the VCR to STOP mode without Video Signal.(VIDEO IN JACK is shorted with Ground)
2) Connect the frequency counter TJ391.
3) After Inserting Rec Tape REC in SP Mode
4) Adjust R391 to obtain 4.20 ±0.1 MHz.
Adjustment Parts Check Point Measuring Equipment Test Tape Input Signal
R391 TJ391 Frequency Counter - -
SYNC TIP
R391
CH-1
Oscilloscope
CH-2
TJ391
VIDEO IN is shorted with Ground

10
ELECTRICAL ADJUSTMENT
(4) FM DEVIATION
v CONNECTION METHOD
v ADJUSTMENT PROCEDURE
1) Supply the Color Bar Signal to the VIDEO IN JACK, and set the VCR to the REC mode.
2) Connect the oscilloscope to TJ396 and trigger scope with a composite sync signal at TJ302.
3) Record the Color Bar Signal for a few
minute and playback it. Then confirm that
the playback video output level (TJ396) is
2.0 ±0.2Vp-p.
4) Adjust as follows if the playback video out-
put level is not 2.0 ±0.2Vp-p.
4-1) Adjust R392 a little.
4-2) Record the Color Bar Signal for a few
minute and playback it.
4-3) Confirm the playback video output
level.
4-4) Repeat the procedure of 4-1) to 4-3)
until the playback video output level becomes 2.0 ( 0.2Vp-p between sync tip and 100% white
level.
Adjustment Parts Check Point Measuring Equipment Test Tape Input Signal
R392 TJ396 Signal Gen. Oscilloscope Blank Tape Color Bar
2.0V 0.2Vp-p
TJ396
Horizontal :10 s/div
Vertical :0.5V/div
FMDEV
TJ396
TJ302
CH-1
Oscilloscope
CH-2
SIGNAL
GENERATOR
R392

11
ELECTRICAL ADJUSTMENT
3. AUDIO CIRCUIT ADJUSTMENT METHOD
(1) AUDIO RECORD BIAS
v CONNECTION METHOD
v ADJUSTMENT PROCEDURE
1) Supply the signal in the OPEN mode.
2) Connect the Audio Level Meter to R01 at the Deck AC Head.
3) After inserting a blank tape, record in SP mode.
4) Adjust R292 to obtain 3 m Vrms .
Adjustment Parts Checking Point Measuring Equipment Condition of Adj. Test Tape
R292 -Audio Level Meter REC mode Blank Tape
R292 REC BIAS
(+)
Audio (-)
Level Meter

12
SPECIFICATIONS
Video Signal system PAL
REC/PB System Helical scanning system
Tape Width 12.65mm (1/2 inch), VHS
Record system of Luminance Signal Frequency modulation record
Record system of Color Signal Down converted subcarrier phase shift system
Tape Speed (E-180) 3H : 23.39mm/s , 36H : 1.95mm/s,
12H : 4.68mm/s, 24H : 2.60mm/s
Record/Play Time (E-180) SP : 3H/12H/24H/36H
FF/REW Time (E-180) Within 3 minutes
Video Signal Input 1.0Vp-p 75Ω, unbalanced
Video Signal Output 1.0Vp-p 75Ω, unbalanced
Luminance Signal to Noise ratio SP : Minimum 40dB
Horizontal resolution Mimimum 350 Lines (B/W), Minimum 300 Lines (Color)
Audio Signal Input Line Input -8.8dBm (1KHz), 47KΩminimum
Audio Signal Output Line Output -7.8dBm (1KHz), 1KΩmaximum
Audio Signal to Noise Ratio (A.Weighted) SP : 40dB minimum VHS
Audio Frequency Range SP : 0+3, -6dB [100Hz~8KHz] VHS
Distortion SP : 4% maximum VHS
WOW Flutter SP : 0.3% maximum VHS
Alarm input DC 4~5V (open), DC 0~0.8V (closed) / 5.7kΩ
Alarm output DC 4~5V (High), DC 0~0.8V (Low) / 5.7kΩ
Panic input DC 4~5V (open), DC 0~0.8V (closed) / 5.7kΩ
End output DC 4~5V (High), DC 0~0.8V (Low) / 5.7kΩ
Warning output DC 4~5V (High), DC 0~0.8V (Low) / 5.7kΩ
Series input DC 4~5V (High), DC 0~0.8V (Low) / 5.7kΩ
Series output DC 4~5V (High), DC 0~0.8V (Low) / 5.7kΩ
Switch output DC 4~5V (High), DC 0~0.8V (Low) / 5.7kΩ
Common GND
Microphone Input -60dBs 3.5mm mini Jack 10k ohm, unbalanced
Accuracy of Timer Within 2 seconds per day
Compensate Time for Power Fail About 1 Month
Power Supply AC 90~260V, 50Hz
Power Consumption 17W
Operation Temperature 5°C ~ 35°C (Humidity : under 80%)
Storage Temperature -20°C ~ 60°C
Dimension (W x H x D) 360 x 90 x 300 (mm)
Weight Approximate 4.3 Kg (NET)

13
TIMELAPSE REC/PB SPEED CHART
TAPE MODE TAPE SPEED REMARK
REC
MODE E-180 SP 3H 12H 24H 36H
PLAY
MODE SPE-180 3H 12H 24H 36H
AUDIO POSSIBLE IMPOS-
SIBLE
REAL REC
TIME
12Hj15H
24Hj27H

14
CIRCUIT OPERATION
1. VIDEO PART
1-1) EE MODE
Video Signal which is output from RL902 is input to pin 37 of IC301 through OSD IC. It is amplified 6dB by
AGC, then it is output to pin 34. This output signal is output to Video Jack through RL902 of RELAY IC.
1-2) REC MODE
The signal which is input to pin 37 of IC301 is output to pin 3 through IC internal AGC AMP. This output
signal is input to pin 4 of IC301 by passing Emphasis circuit of external IC. Luminance signal is output
from pin 40 after FM modulator through MAIN-Emphasis and color signal is output from pin 15 after low-
converted. Each signal is input to pin 12 of IC401 through REC-EQ, then it is recorded on the tape
through HEAD after passing out MIX AMP.
VIDEO IN VIDEOOUT
V.IN
IC001
OSD IC IC301
VIDEO IC
REC EQ
IC401 HEAD AMP
Y-EMPA
CIRCUIT
REC C
REC Y

15
CIRCUIT OPERATION
1-3) PB MODE
When playing the tape, the signal which is picked up from the tape is amplified 60 dB. Then luminance
signal goes to pin 11 and color signal goes to pin 7 through AGC. Luminance signal of pin 11 is input to
pin 39 of IC301 through PB EQ circuit in order to match playback characteristic. Color signal which is
output from pin 7 of IC401 is input to pin 15 of IC301. PB FM signal is demodulated by IC internal
demodulator then it is output to pin 3 after MAIN DE-Emphasis process. If this output signal has burst,
color component will be separated by emphasis circuit. The signal which is input to pin 4 is output from
pin 12 through 3.5M LPF, then it is input to pin 10 through 2H CCD. Color signal which is input to pin 15
passes ACC in order to stabilize level, then 4.43M components will be extracted by 4.43M BPF through
Main Converter.
This 4.4Mhz color signal removes crosstalk component through X302 and is input to pin 29 of IC301
then it will be mixed with luminance signal after passing CNR circuit. Finally Y/C composite video signal
is output from pin 34.
V-OUT
V.IN
IC401
HEAD AMP
X302 2H DLY
Y-EMPH
IC302
2H CCD
IC301
VIDEO IC
PB EQ

16
CIRCUIT OPERATION
2. AUDIO PART
2-1) EE MODE
External AUDIO signal which is input to pin 16 of IC201 is output from pin 22 of IC201 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 pin 24 of IC201. 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 mode’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 tape’s full erasing and
AUDIO TRACK erasing.
2-3) PB MODE
It will be the PB mode when PB 5V is input to pin 11 of IC201. 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.12/24H AUDIO output level will be compensated
with receiving Audio 12H/Audio 24H control of u-COM. Finally this output signal is output through 20KHz
LPF.

17
CIRCUIT OPERATION
3. SERVO SYSCON PART
3-1) BLOCK DIAGRAM
DRUM
PG FG AMP CAPSTAN
SPEED CTL
IC501
M37775M5H
u-COM
PROCESSOR
Start end
SENSOR
&
REEL
SENSOR
LOADING
CAM DRIVE
CTL
AMP
VIDEO
BLOCK AUDIO
BLOCK TERMINAL BLOCK
BACK
UP BATT
Vcc OSC&
RESETP
<K580DZ-T SERVO SYSCON BLOCK>

18
CIRCUIT OPERATION
3-2) TIME LAPSE RECORDING METHOD
The numbers of VHS 3HOUR (SP), 50 field/sec, then it will be 1FRAME = 40Ms, 1FIELD = 20Ms.
CAPSTAN MOTOR FG numbers for Time Lapse are 3HOUR(SP) = 756*2=1512 numbers/sec.
uu-COM controls capstan motor (C I LIMIT) with capstan motor FG numbers. DRUM HEAD ON/OFF
controlled by HEAD AMP SW & REC mute signal.
uu-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
20ms
15H(SP) RECORDING (10FIELD/SEC)
3H(50FIELD/SEC)
LRL
80ms
15H (10FIELD/SEC) : Recording 1 field per 5 fields
(CapstanFG numbers are ;1SEC:1512=80ms:X X=121)
(CapstanFG numbers are ;1SEC:1512=20ms:X X=30)
LRLRLRLRLRLRL
20ms
27H(SP) RECORDING (5.55FIELD/SEC)
: recording 1 field per 9fields
LR
20ms*8=160ms
27H (5.5FIELD/SEC) : Recording 1 field per 9 fields
(Capstan FG numbers are ; 1SEC:1512=160ms:X X=242)
(CapstanFG numbers are ; 1SEC:1512=20ms:X X=30)
RLRLRL
L

19
CIRCUIT OPERATION
3-3) TERMINAL PART
ALARM INPUT
Connect DOOR SW&SENSOR etc and this port will be used for emergency recording by using open/
close status.
ALARM OUTPUT
This port is always triggered during ALARM REC, which is used to inform the outside that time lapse
VCR is now performing Alarm Recording.
uTrigger Time will be the set time on MENU, it will be approximately 2 minutes at least.
PANIC INPUT
This is the first priority REC, then operation is similar as Alarm Rec. But if Panic Recording is triggered,
the set stops all kinds of Recording then starts recording with 2H(SP) mode at the end of tape.
5V
0V 500ms
500ms
N/O(NORMALY OPEN)
N/C(NORMALYCLOSED)
0V
5V
0V Minimum2mins. Minimum 2mins.
HIGH LOW
5V
0V 500ms 500ms
N/CLOSED N/OPEN
5V