Daewoo DV-K580NZ-T User Manual
S/M No. : VK580NTEF0
Service Manual
TIME LAPSE VCR
Model: DV-K580NZ-T
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr
Jan. 2000
TABLE OF CONTENTS
SAFETY&PRECAUTIONS ............................................................................................... 2
EXTERNAL VIEWS ........................................................................................................ 4
FRONT VIEWS FUNCTION ...................................................................................................................4
REAR VIEWS FUNCTION .....................................................................................................................5
ELECTRICAL ADJUSTMENT ........................................................................................... 6
SPECIFICATIONS ....................................................................................................... 14
TIMELAPSE REC/PB SPEED CHART ................................................................................ 15
CIRCUIT OPERATION .................................................................................................. 16
TROUBLE SHOOTING FLOW CHART ............................................................................. 24
POWER CIRCUIT ................................................................................................................................24
SERVO-SYSCON CIRCUIT ...................................................................................................................26
VIDEO CIRCUIT .................................................................................................................................34
AUDIO CIRCUIT .................................................................................................................................38
u-COM PORT DESCRIPTION ....................................................................................... 41
VOLTAGE CHART ....................................................................................................... 44
CIRCUIT DIAGRAM ..................................................................................................... 50
CONNECTION DIAGRAM ..................................................................................................................50
POWER CIRCUIT DIAGRAM ................................................................................................................51
SYSCON CIRCUIT DIAGRAM ..............................................................................................................52
VIDEO CIRCUIT DIAGRAM .................................................................................................................53
HEADAMP CIRCUIT DIAGRAM ............................................................................................................54
OSD CIRCUIT DIAGRAM ....................................................................................................................55
Y/C SEPARATION CIRCUIT DIAGRAM ..................................................................................................56
AUDIO CIRCUIT DIAGRAM .................................................................................................................57
LOGIC CIRCUIT DIAGRAM .................................................................................................................58
TERMINAL CIRCUIT DIAGRAM ............................................................................................................59
COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW ........................................... 60
PCB MAIN .........................................................................................................................................60
PCB UNION .......................................................................................................................................61
DISASSEMBLY ............................................................................................................. 62
PANEL FRONT ASS’Y ...........................................................................................................................62
SET TOTAL ASS’Y .................................................................................................................................63
PACKING ASS’Y .................................................................................................................................64
ELECTRICAL PARTS LIST ............................................................................................... 65
1
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), (d
’
) between soldered terminals,
and between terminals and surrounding metallic parts. See table below.
Rating for selected areas
AC Line Voltage Region
100V Japan
110 to 130V
* 110 to 130V
200 to 240V
* : Class model only
USA & Canada
Latin America
Europe
Australia
Insulation
Resistance
]
1MΩ/500V DC
- 900V AC 1min.
]
10MΩ/500V DC 4kV AC 1min.
Dielectric
Strength
1kV AC 1min.
NOTE
This table is unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.
Clearance
Distance(d),(d)
]
3
]
3.2
]
6(d)
]
8(d')
(a :Power cord)
2
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 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.
Leakage current ratings for selected are as
AC Line Voltage Region Load Z Leakage Current(i) Clearance Distance(d),(d’)
100V Japan
1k
Ω
110 to 130V USA &Canada
110 to 130V
200 to 240V
Europe
Australia
1k
2k
50k
15kµF
Ω
Ω
Ω
NOTE
This table is unofficial and for reference only. Be sure to confirm the precise values
for your particular country and locality.
i*
1mArms
i*
0.5mArms Exposed accessible parts
i*
0.7mA peak
i*
2mAdc
i*
0.7mA peak
i*
1mAdc
Exposed accessible parts
Antenna earth terminals
Other terminals
3
EXTERNAL VIEWS
1. FRONT VIEWS FUNCTION
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
4
2. REAR VIEWS FUNCTION
EXTERNAL VIEWS
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
5
ELECTRICAL ADJUSTMENT
1. SERVO/SYSCON CIRCUIT ADJUSTMENT METHOD
v
VIDEO HEAD SWITCHING POSITION
Adjustment Part Checking Point Measuring Equipment Mode Test Tape
R595
v
CONNECTION METHOD
TJ396
TJ396
PT501 PIN3
OSCILLOSCOPE Play DN-1 (Color Bar)
CH-1
Oscilloscope
CH-2
PT501
v
ADJUSTMENT PROCEDURE
R595
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.
CH1
Vertical SYNC Signal
1H
6.5H 0.5H
Trigger Position
SW PULSE
(PT501 3PIN)
VIDEO OUT
(TJ396)
6
ELECTRICAL ADJUSTMENT
2. VIDEO CIRCUIT ADJUSTMENT METHOD
(1) EE LEVEL
Adjustment Parts Checking Point Measuring Equipment Test Tape Input Signal
R395 TJ396 Signal Gen. Oscilloscope - Color Bar
v
CONNECTION METHOD
TJ302
R395
TJ396
v
ADJUSTMENT PROCEDURE
EE
CH-1
Oscilloscope
CH-2
SIGNAL
GENERATOR
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
TJ395
2.0V 0.2Vp-p
Horizontal :10 s/div
Vertical :0.1V/div
7
ELECTRICAL ADJUSTMENT
(2) PLAYBACK Y-SIGNAL OUTPUT LEVEL
Adjustment Parts Checking Point Measuring Equipment Test Tape Input Signal
R396 TJ396 Oscilloscope DN-1 -
v
CONNECTION METHOD
TJ396
TJ302
CH-1
Oscilloscope
CH-2
PB-Y
R396
v
ADJUSTMENT PROCEDURE
1) Playback the COLOR BAR Test tape (DN-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.
TJ396
2.0V 0.2Vp-p
Horizontal :10 s/div
Vertical :0.5V/div
8
ELECTRICAL ADJUSTMENT
(3) SYNC TIP FREQUENCY
Adjustment Parts Check Point Measuring Equipment Test Tape Input Signal
R391 TJ391 Frequency Counter - -
v
CONNECTION METHOD
R391
VIDEO IN is shorted with Ground
TJ391
SYNC TIP
CH-1
Oscilloscope
CH-2
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.
9
ELECTRICAL ADJUSTMENT
(4) FM DEVIATION
Adjustment Parts Check Point Measuring Equipment Test Tape Input Signal
R392 TJ396 Signal Gen. Oscilloscope Blank Tape Color Bar
v
CONNECTION METHOD
TJ396
TJ302
CH-1
Oscilloscope
CH-2
R392
FM DEV
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 output 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.
SIGNAL
GENERATOR
TJ396
2.0V 0.2Vp-p
Horizontal :10 s/div
Vertical :0.5V/div
10
ELECTRICAL ADJUSTMENT
(5) C RECORD CURRENT
Adjustment Parts Check Point Measuring Equipment Test Tape Input Signal
R492 TJ491 Signal Gen. Oscilloscope Blank Tape Color Bar
v
CONNECTION METHOD
TJ302
R492
REC-C
R491
TJ491
CH-1
Oscilloscope
CH-2
SIGNAL
GENERATOR
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 TJ491 and trigger the scope with a composite sync signal at TJ302.
3) Adjust R491 until Y-FM record current is minimized.
4) Adjust R492 until color record current is 130 ± 10mVp-p.
Burst
TJ491
11
130 10mVp-p
ELECTRICAL ADJUSTMENT
(6) Y RECORD CURRENT
Adjustment Parts Checking Point Measuring Equipment Test Tape Input Signal
R491 TJ491 Signal Gen. Oscilloscope Blank Tape Color Bar
v
CONNECTION METHOD
TJ302
REC-Y
R491
TJ491
CH-1
Oscilloscope
CH-2
SIGNAL
GENERATOR
v
ADJUSTMENT PROCEDURE
1) Supply the Color Bar Signal to the VIDEO IN JACK.
2) After Inserting a Rec Tape, Rec in SP MODE.
3) Connect the oscilloscope to TJ491
and trigger the scope with a composite sync signal at TJ302.
4) Adjust R491 until Y-FM record current
is 500 ± 10mVp-p. (Standard SYNC
Tip)
TJ491
500V 10mVp-p
12
ELECTRICAL ADJUSTMENT
3. AUDIO CIRCUIT ADJUSTMENT METHOD
(1) AUDIO RECORD BIAS
Adjustment Parts Checking Point Measuring Equipment Condition of Adj. Test Tape
R292 - Audio Level Meter REC mode Blank Tape
v
CONNECTION METHOD
R292
REC BIAS
(+)
Audio
(-)
Level Meter
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 .
13
SPECIFICATIONS
Video Signal system NTSC
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 (T-120)
Record/Play Time (T-120) SP : 2H/24H/36H, EP : 6H/18H/24H (PLAY)
FF/REW Time (T-120) 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 45dB, EP : Minimum 41dB
Horizontal resolution Mimimum 350 Lines (B/W), Minimum 300 Lines (Color)
Audio Signal Input Line Input -8.8dBm (1KHz), 47K
Audio Signal Output Line Output -7.8dBm (1KHz), 1K
Audio Signal to Noise Ratio (A.Weighted) SP : 42dB minimum VHS, EP : 40dB minimum VHS
Audio Frequency Range SP : 0+3, -6dB [100Hz~10KHz] VHS, EP : 0+3, -6dB [100Hz~5KHz] VHS
Distortion SP : 4% maximum VHS, EP : 5% maximum VHS
WOW Flutter SP : 0.3% maximum VHS, EP : 0.4% maximum VHS
Alarm input DC 4~5V (open), DC 0~0.8V (closed) / 5.7k
Alarm output DC 4~5V (High), DC 0~0.8V (Low) / 5.7k
Panic input DC 4~5V (open), DC 0~0.8V (closed) / 5.7k
2H : 33.35mm/s (SP), 6H : 11.12mm/s(EP),
18H : 3.71mm/s, 36H : 1.85mm/s
Ω
minimum
Ω
maximum
Ω
Ω
Ω
End output DC 4~5V (High), DC 0~0.8V (Low) / 5.7k
Warning output DC 4~5V (High), DC 0~0.8V (Low) / 5.7k
Series input DC 4~5V (High), DC 0~0.8V (Low) / 5.7k
Series output DC 4~5V (High), DC 0~0.8V (Low) / 5.7k
Switch output DC 4~5V (High), DC 0~0.8V (Low) / 5.7k
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 120V, 60Hz
Power Consumption 17W
Operation Temperature
Storage Temperature
Dimension (W x H x D) 360 x 90 x 300 (mm)
Weight Approximate 4.3 Kg (NET)
5°C ~ 35°C (Humidity : under 80%)
-20°C ~ 60°C
Ω
Ω
Ω
Ω
Ω
14
TIMELAPSE REC/PB SPEED CHART
TAPE MODE TAPE SPEED REMARK
SP 2H 24H 36H
T-120
EP 6H 18H
REC MODE
SP 2.7H 32H 49.5H
T-160
EP 8H 24H
SP 2H 24H 36H
T-120
EP 6H 18H 24H
PLAY
MODE
SP 2.7H 32H 49.5H
T-160
EP 8H 24H
EP 24H MODE
IS POSSIBLE
IN PLAY
MODE.
AUDIO POSSIBLE NOT POSSIBLE
15
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. If this output signal has burst,
it is input to X303 then it separates color signal. If it has not burst, it will pass Y-Emphasis circuit. Each signal is input to
pin 4 then passes 3.5M LPF. 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
IC001
OSD IC
V.IN
REC Y
REC EQ
IC401 HEAD AMP
VIDEO OUT
IC301
VIDEO IC
REC C
WITH
BURST
X303
Y/C
COMB
Y-EMPA
CIRCUIT
16
CIRCUIT OPERATION
1-3) PB MODE
When playing the tape, the signal which is picked up from the tape is amplified 50 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 input to pin 3 after MAIN DE-Emphasis process. If this
output signal has burst, color component will be separated by X303. If it has burst, it is input to pin 4 of IC301 through Yemphasis 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 1H CCD. Color signal which is input to pin 15 passes ACC in order to stabilize level, then 3.58H components will
be extracted by 3.58M BPF through Main Converter.
This 3.58M color signal is input to pin 25 of IC301 in order to eliminate crosstalk, then it will be mixed with luminance signal after passing CNR circuit. Finally Y/C composite video signal is output from pin 34.
V.IN
V-OUT
PB EQ
IC401
HEAD AMP
IC301
VIDEO IC
IC302
IH CCD
X302 IH DLY
Y-EMPH
X303
Y/C
COMB
17
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 amplified 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 amplified 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.18H AUDIO output level will be compensated with receiving Audio 24H(H) control of u-COM.
Finally this output signal is output through 20KHz LPF.
18
3. SERVO SYSCON PART
3-1) BLOCK DIAGRAM
CIRCUIT OPERATION
DRUM
PG FG AMP
Start end
SENSOR
&
REEL
SENSOR
Vcc
BACK
UP BATT
CAPSTAN
SPEED CTL
IC501
M37775M5H
u-COM
PROCESSOR
LOADING
CAM DRIVE
CTL
AMP
OSC&
RESET
VIDEO
BLOCK
AUDIO
BLOCK
<K580N-T SERVO SYSCON BLOCK>
19
TERMINAL
BLOCK
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.
18H(EP) RECORDING (20FIELD/SEC)
2H & 6H (60FIELD/SEC)
16.65ms
L R L R L R L R L R L R L
(Capstan FG numbers are ; 1SEC:720=16.65ms:X X=12)
18H (20FIELD/SEC) : Recording 1 field per 3 fields
33.3ms
L R L R L
(Capstan FG numbers are ; 1SEC:720=33.3ms:X X=24)
u
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.
24H(SP) RECORDING (5FIELD/SEC)
: recording 1 field per 12 fields
16.65ms
L R L R L R L R L R L R L
(Capstan FG numbers are ; 1SEC:720=16.65ms:X X=12)
18H (20FIELD/SEC) : Recording 1 field per 3 fields
16.65ms*10=166.6ms
L R
(Capstan FG numbers are ; 1SEC:2160=166.6ms:X X=36)
u
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.
20
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.
N/O(NORMALY OPEN)
5V
500ms
0V
N/C(NORMALY CLOSED)
5V
500ms
0V
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.
5V
Minimum 2mins.
Minimum 2mins.
0V
HIGH
u
Trigger 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.
LOW
5V
0V
500ms
N/CLOSED
500ms
N/OPEN
21
CIRCUIT OPERATION
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.
5V
END Detect END Detect
0V
HIGH
SW OUTPUT
This port is used triggering video signal with external equipment during recording.
VIDEO
SIGNAL
SW
OUT
1FIELD
SW
OUT
2FIELD
4ms
SERIES OUTPUT
When the series recording proceeds after setting the series recording to “on”, this port is used to output the control signal
to the set which will be recorded continuously after pre-recording set.
16.67ms
LOW
5V
0V
250ms
22
CIRCUIT OPERATION
SERIES INPUT
When the series recording proceeds after setting the series recording to “on”, this port is used to receive the control signal
to the set which will be recorded continuously after pre-recording set.
5V
200ms
0V
WARNING OUTPUT
This port is used to inform emergency status of Time Lapse VCR Set to outsider.
5V
0V
5V
0V
EMER
status term
HIGH
500ms
LOW
23
Loading...