Daewoo DV-K11WZ-PB/A Manuale utente
Service Manual
Model :
DV-K11WZ-PB/A
DV-K11WY-PB
DV-K11WZ-QB/A
DAEWOO ELECTRONICS CO., LTD
OVERSEAS SERVICE DEPT.
GENERAL
Power requirement AC90~260V, 50/60Hz
Power consumption Typical 13W
Temperature 5¡£C~35¡£C (Operating)
-20 C~60 C
(Storage temperature)
Operating position Horizontal only
Dimensions (WxHxD) 360x90x312 (mm)
Weight Approx 5.4kg
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
video cassette
Maximum recording time
with full-size cassette (SP): 45 min. with E-45
cassette
VIDEO
Signal system PAL color 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
More than 43 dB (Rohde & Schwarz
noise mater)
Horizontal resolution
More than
240 lines
AUDIO
Input -8 dBs, (CENELEC standard)
more than 47 k-ohms, unbalanced
Output -6 dBs, (CENELEC standard),
less than 1 k-ohm, unbalanced
(10 k-ohms, load)
Frequency range 100 Hz to 8,000 Hz
/20 Hz to 20 KHz (Hi-Fi)
Signal to noise ratio 38 dB (More than)
/60dB (More than):Hi-Fi
Audio Distortion Less than 3%(SP)
/Less than 0.5%(SP):Hi-Fi
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.
Table 1: Rating for selected areas
* 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)
Insert load Z between B (earth ground, power cord plug prongs)
and exposed accesible parts. Use and AC voltmeter to measure
across both terminals of load Z. See figure 2 and following table.
Table 2: Leakage current ratings for selected areas
Note: This table is unofficial and for reference only. Be sure to confirm the precise values for your particular country and
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')
AC Line Voltage Region Earth Ground
Load Z Leakage Current (i) (B) to:
100V Japan ¡ ≤1m A rms Exposed accessible
parts
110 to 130 V USA & ¡ ≤0.5 m A rms Exposed accessible
parts
¡ ≤0.7 m A peak Antenna earth
110 to 130 V Europe ¡ ≤2 m A dc terminals
200 to 240 V Australia ¡ ≤0.7 m A peak Other terminals
1k
1.5k
1.5kµF
2k
50k
d
Primary circuit termimals
Chassis
d'
a
Z
Exposed
accessible
part AC Voltmter
(high impedance)
Earth Ground
power cord plug prongsB
Fig. 1
Fig. 2
INFORMATION
1. CONTROLS AND FUNCTIONS
...................................................................................................2
2. ELECTRICAL ADJUSTMENTS
2-1. SERVO CIRCUIT ADJUSTMENT METHOD.......................................................................................3
2-2. AUDIO CIRCUIT ADJUSTMENT METHOD........................................................................................4
3. TROUBLE SHOOTING FLOW CHART
3-1. POWER CIRCUIT.................................................................................................................................5
3-2. SERVO-SYSCON CIRCUIT.................................................................................................................7
3-3. AUDIO CIRCUIT (NORMAL)..............................................................................................................12
3-4. AUDIO CIRCUIT (HI-FI)......................................................................................................................14
3-5. VIDIO CIRCUIT ..................................................................................................................................16
4. WAVEFORMS ON VIDEO CIRCUIT
........................................................................................22
5. µ-COM PART
.......................................................................................................................................25
6. CIRCUIT DIAGRAM
..........................................................................................................................27
6-1. CONNECTION DIAGRAM .................................................................................................................27
6-2. POWER CIRCUIT DIAGRAM.............................................................................................................28
6-3. SERVO/SYSCON CIRCUIT DIAGRAM.............................................................................................29
6-4. VIDEO & HEAD-AMP CIRCUIT DIAGRAM.......................................................................................30
6-5. AUDIO CIRCUIT DIAGRAM...............................................................................................................31
6-6. HI-FI AUDIO CIRCUIT DIAGRAM......................................................................................................32
6-7. KARAOKE CIRCUIT DIAGRAM.........................................................................................................33
6-8. LOGIC SW CIRCUIT..........................................................................................................................34
7. COMPONENTS LOCATION GUIDE ON PCB BOTTOM VIEW
.................................35
8. DISASSEMBLY
8-1. PACKING ASSEMBLY.......................................................................................................................37
8-2. SET ASSEMBLY.................................................................................................................................38
8-3. PAN ASSEMBLY................................................................................................................................39
9. ELECTRICAL PARTS LIST
............................................................................................................40
Z-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB D
V-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11W
Z-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB D
V-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11W
Z-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB D
V-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11W
Z-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB D
V-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11WY-PB DV-K11WZ-QB/A DV-K11WZ-PB/A DV-K11W
VIDEO CASSETTE RECORDER
1. CONTROL AND FUNCTIONS
FRONT
DV-K11WZ-PB/A
DV-K11WY-PB (Hi-Fi)
DV-K11WZ-QB/A (NORMAL)
REAR
2
PLAY
AUTO REPEAT
REC
DIGITAL ECHO VOL 1 VOL 2
MIC 1 MIC 2
PAUSE/STILL REW PLAY FF
L Hi-Fi R
CST.IN NTSC A.REPEAT REC DV-K11W
POWER STOP/EJECT
NTSC PLAY BACK RECORDING • HIGH SPEED REWIND
#
PLAY
AUTO REPEAT
REC
DIGITAL ECHO VOL 1 VOL 2
MIC 1 MIC 2
PAUSE/STILL REW PLAY FF CST.IN NTSC A.REPEAT REC DV-K11W
POWER STOP/EJECT
NTSC PLAY BACK RECORDING • HIGH SPEED REWIND
#
RF OUT
CH.R CH.L
TEST ON
OFF
ANT. IN
VIDEO AUDIO
LR
IN
OUT
RF OUT
CH.R CH.L
TEST ON
OFF
ANT. IN
VIDEO AUDIO
IN
OUT
SERVO CIRCUIT ADJUSTMENT METHOD
VIDEO HEAD SWITCHING POSITION
!Connection Method
@Adjustment Procedure
1. Play back the test tape.(STAIR STEP DP-2)
2. Set the oscilloscope in the chop mode. Connect CH1 to the SW pulse(PT01 PIN#), and CH2 to the VIDEO
OUT(R305 ) and trigger the scope with signal from CH1.
3. Adjust R595 to the positive rising edge of SW PULSE at 6.5H±0.5H from the V-SYNC.
2. ELECTRICAL ADJUSTMENT
3
Adjustment Parts Checking Point Measuring Equipment Mode Test Tape
R305 DP-2
R595 PT01 PIN ¤Ø Oscilloscope PLAY (STAIR STEP)
CH1
CH2
1H 0.5H
6.5H ± 0.5H
VERTICAL SYNC
SW 30Hz
(PT01 PIN)
(R305)
TRIGGER
3
MODULATOR
CH-1
OSCILLOSCOPE
CH-2
R305
PHONE
JACK
PT01 R595
TOP VIEW
POWER
MODULE
6.5H±0.5H
AUDIO CIRCUIT ADJUSTMENT METHOD
AUDIO RECORD BIAS
!Connection Method
@Adjustment Procedure
1. Set the power on mode.
2. Set the input to open mode
3. Connect the Audio level meter to R01
4. After inserting a blank tape, record in SP mode.
5. Adjust R292 to obtain 3.0 mVrms.
4
Adjustment Parts Checking Point Measuring Equipment Test Tape Input Signal
R292 A/C Head PCB Audio level meter Rec None signal
R01
+
–
A/CHEAD
R01
Audio LEVEL METER
MODULATOR
PHONE
JACK
POWER
MODULE
R292
3.0mVrms
DECK ASSY
A/C HEAD
3. TROUBLE SHOOTING FLOW CHART
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 KΩresistance)
• 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 SM801(POWER MODULE), check FUSE and Cement resistance surely.
5
YES
NO
NO
YES
YES
YES
YES
Prepare the instrument
connecting the insulating trans.
Check F801 FUSE
Is voltage applied to D801?
Is voltage applied to the
both terminals of C807?
Check power module
Check D801, L801
Check R802
NO output Voltage
6
Is voltage supplied
Via CN11?
The voltage of #1 of
IC11 is 5.7V and stable
The voltage of #1 of IC11
fluctuate
in 4.8V~5.7V
Measure resistance
between GND of CN21
and each terminal
of CN21
The 12DC of each
wire of T11 is ok
Primary parts is ok
Secondary parts ok
Change T11
Change parts
out of order
YES
NO
YES
Resistance >> 100Ω
YES
YES
NO
Check F801, L801,
D802
NO
Check the secondary
circuit
YES
YES
Check the pattern
and T11, L11, IC11
NO
NO
Terminal open and
measure the output
Voltage
Change parts
out of order
The voltage
is ok Check the
parts outside
module
Check the Diode,
Condenser inside
Module
NO
NO
No Voltage
output
SERVO SYSCON CIRCUIT
7
58
The voltage of pin
of IC601 is not
changed.
Is CTL pulse input
to pin IC501
7
20
Check and
re-adjust the
Path of Deck.
Check circuit
adjacent to IC601
Check C503, C504,
C506
check R539, C518
Check IC601
YES
YES
YES
YES
YES
YES
YES
NO
NO NO
NO
NO
NO
Noise appears
although adjusting
tracking.
Is CTL pulse out
from pin of IC601.
Noise shakes up
and down on the
screen.
Adjust
tracking
CTL HEAD height is
normal and there is
not dust.
Adjust the HEAD
height and remove
dust
Noise appears
although change
cassette tape.
Playback picture
is not good.
A
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