Samsung DVD-V440 User manual

DVD-VCR COMBINATION
Chassis : Kaiser
~$V-DVD440—
DVD- -V440 |
SERVICE
"22"
a
If
you
want
to
know
additional
information
which
is
not
included
on
this
Service
Manual,
please
refer
to
the
SV-DVD440
Training
Manual
(AK82-00513A).
DVD-VCR COMBINATIO
1. Precautions |
2. Alignment and Adjustment
3. Exploded Views and Parts List
4. Electrical Parts List
5. Block Diagram
6. Schematic Diagrams

@ MODE SWITCH (PROGRAM SWITCH) ASSEMBLY POINT
1) When installing the assy deck on the Main PCB, be sure to align the assembly point of mode switch.
EES
VCR MAIN PCB
@ HOW TO EJECT THE CASSETTE TAPE
(if the tape is stuck in the unit)
Fig. 1
1)
Turn
the
Gear
Worm
@
clockwise
in
the
direction
of
arrow
with
a
screwdriver.
(See
Fig.
2)
(Other method ; Remove the screw of Motor Load Ass’y, Separate the Motor Load Ass’y)
2)
When
Slider.S,
T
approachs
the
unloading
position,
rotate
holder
Clutch
counterclockwise
after
inserting
screwdriver
in
the
frame's
bottom
hole
in
order
to
wind
the
unwound
tape.
(Refer
to
Fig.
3)
(If
you
rotate
Gear
Worm
@
continuously
when
tape
is
unwinding,
you
may
cause
tape
contamination
by
grease
and
tape.
damage.
Be
sure
to
wind
the
unwound
tape
with
the
unit
in
the
horizontall
position.)
3)
Rotate
Gear
Worm
@
clockwise
using
a
screwdriver
until
the
mecha
is
in
the
eject
state.
Remove
the
tape.
(Refer
to
Fig.
2)
-
GEAR WORM
Fig. 2

1. Precautions
1-1 Safety Precautions
1) Before returning an instrument to the customer,
always make a safety check of the entire instrument,
including, but not limited to, the following items:
(1) Be sure that no built-in protective devices are
defective or have been defeated during servicing.
(1)Protective shields are provided to protect both
the technician and the customer. Correctly replace
all missing protective shields, including any
removed for servicing convenience.
(2)When reinstalling the chassis and/or other as-
sembly in the cabinet, be sure to put back in place
all protective devices, including, but not limited to,
nonmetallic control knobs, insulating fish papers,
adjustment and compartment covers/shields, and
isolation resistor /capacitor networks. Do not oper-
ate this instrument or permit it to be operated with-
out all protective devices correctly installed and
functioning.
(2) Be sure that there are no cabinet openings through
which adults or children might be able to insert
their fingers and contact a hazardous voltage. Such
openings include, but are not limited to, excessive-
ly wide cabinet ventilation slots, and an improper-
ly fitted and/or incorrectly secured cabinet back
cover.
(3) Leakage Current Hot Check-With the instrument
completely reassembled, plug the AC line cord
directly into a 120V AC outlet. (Do not use an iso-
lation transformer during this test.) Use a leakage
current tester or a metering system that complies
with American National Standards institute (ANSI)
C101.1 Leakage Current for Appliances and
Underwriters Laboratories (UL) 1270 (40.7). With
the instrument’s AC switch first in the ON position
and then in the OFF position, measure from a
known earth ground (metal water pipe, conduit,
etc.) to all exposed metal parts of the instrument
(antennas, handle brackets, metal cabinets, screw-
heads, metallic overlays, control shafts, etc.), espe-
cially any exposed metal parts that offer an electri-
cal return path to the chassis.
Any current measured must not exceed 0.5mA.
Reverse the instrument power cord plug in the out-
let and repeat the test. See Fig. 1-1.
Any measurements not within the limits specified
herein indicate a potential shock hazard that must
be eliminated before returning the instrument to
the customer.
(READING SHOULD
NOT BE ABOVE
0.5mA)
LEAKAGE
CURRENT
TESTER
DEVICE
UNDER
TEST
TEST ALL
EXPOSED METER
SURFACES
2-WIRE CORD
ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)
" EARTH
+ GROUND
Fig. 1-1 AC Leakage Test
(4) Insulation Resistance Test Cold Check-(1) Unplug
the power supply cord and connect a jumper wire
between the two prongs of the plug. (2) Turn on the
power switch of the instrument. (3) Measure the
resistance with an ohmmeter between the
jumpered AC plug and all exposed metallic cabinet
parts on the instrument, such as screwheads,
antenna, control shafts, handle brackets, etc. When
an exposed metallic part has a return path to the
chassis, the reading should be between 1 and 5.2
megohm. When there is no return path to the chas-
sis, the reading must be infinite. If the reading is
not within the limits specified, there is the possibil-
ity of a shock hazard, and the instrument must be
repaired and rechecked before it is returned to the
customer. See Fig. 1-2.
Antenna
Terminal
Exposed
Metal Part
ohmmeter
Fig. 1-2 Insulation Resistance Test
Samsung Electronics
1-1

Precautions
2) Read and comply with all caution and safety re-
lated notes on or inside the cabinet, or on the chas-
sis.
3) Design Alteration Warning-Do not alter or add to
the mechanical or electrical design of this instru-
ment. Design alterations and additions, including
but not limited to, circuit modifications and the
addition of items such as auxiliary audio output
connections, might alter the safety characteristics of
this instrument and create a hazard to the user. Any
design alterations or additions will make you, the
servicer, responsible for personal injury or property
damage resulting therefrom.
4) Observe original lead dress. Take extra care to
assure correct lead dress in the following areas:
(1) near sharp edges, (2) near thermally hot parts (be
sure that leads and components do not touch ther-
mally hot parts), (3) the AC supply, (4) high voltage,
and (5) antenna wiring. Always inspect in all areas
for pinched, out-of-place, or frayed wiring, Do not
change spacing between a component and the
printed-circuit board. Check the AC power cord for
damage.
1-2
5) Components, parts, and/or wiring that appear to
have overheated or that are otherwise damaged
should be replaced with components, parts and/ or
wiring that meet original specifications.
Additionally, determine the cause of overheating
and/or damage and, if necessary, take corrective
action to remove any potential safety hazard.
6) Product Safety Notice-Some electrical and mechani-
cal parts have special safety-related characteristics
which are often not evident from visual inspection,
nor can the protection they give necessarily be
obtained by replacing them with components rated
for higher voltage, wattage, etc. Parts that have spe-
cial safety characteristics are identified by shading,
an ( A\)or a ( A\)on schematics and parts lists. Use
of a substitute replacement that does not have the
same safety characteristics as the recommended
replacement part might create shock, fire and/or
other hazards. Product safety is under review con-
tinuously and new instructions are issued whenev-
er appropriate.
Samsung Electronics

1-2 Servicing Precautions
Precautions
CAUTION : Before servicing units covered by this
service manual and its supplements, read and follow
the Safety Precautions section of this manual.
Note : If unforseen circumstances create conflict
between the following servicing precautions and any
of the safety precautions, always follow the safety pre-
cautions. Remember: Safety First.
1-2-1 General Servicing Precautions
(1) a. Always unplug the instrument’s AC power cord.
from the AC power source before (1) re-moving
or reinstalling any component, circuit board,
module or any other instrument assembly, (2)
disconnecting any instrument electrical plug or
other electrical connection, (3) connecting a test
substitute in parallel with an electrolytic capaci-
tor in the instrument.
b. Do not defeat any plug/socket B+ voltage inter-
locks with which instruments covered by this
service manual might be equipped.
c. Do not apply AC power to this instrument and
/or any of its electrical assemblies unless all
solid-state device heat sinks are correctly in-
stalled.
d. Always connect a test instrument’s ground lead
to the instrument chassis ground before connect-
ing the test instrument positive lead. Always
remove the test instrument ground lead last.
Note : Refer to the Safety Precautions section ground
lead last.
(2) The service precautions are indicated or printed on
the cabinet, chassis or components. When servic-
ing, follow the printed or indicated service precau-
tions and service materials.
(3) The components used in the unit have a specified
flame resistance and dielectric strength.
When replacing components, use components
which have the same ratings. Components identi-
fied by shading, by(A\) or by (A\) in the circuit dia-
gram are important for safety or for the characteris-
tics of the unit. Always replace them with the exact
replacement components.
(4) An insulation tube or tape is sometimes used and
some components are raised above the printed
wiring board for safety. The internal wiring is
sometimes clamped to prevent contact with heat-
ing components. Install such elements as they
were.
(5) After servicing, always check that the removed
screws, components, and wiring have been in-
stalled correctly and that the portion around the
serviced part has not been damaged and so on.
Further, check the insulation between the blades of
the attachment plug and accessible conductive
parts.
1-2-2 Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet
and turn the power ON. Connect the insulation resi-
stance meter (500V) to the blades of the attachment
plug. The insulation resistance between each blade of
the attachment plug and accessible conductive
parts(see note) should be more than 1 Megohm.
Note : Accessible conductive parts include metal pan-
els, input terminals, earphone jacks, etc.
Samsung Electronics
1-3

Alignment and Adjustments
2-1-1(b) TEST location for adjustment mode setting
> ATTENTION
UTILISER WW
TEST BUTTON
Fig. 2-2 VCR Main PCB (Top View)
2-2 Samsung Electronics

Alignment and Adjustments
2-1-2
Head
Switching
Point
Adjustment
1)
Playback
the
alignment
tape.
2)
Press
the
“TEST”
botton
on
VCR
MAIN
PCB
to
set
the
adjustment
mode.
(See
Fig.
2-2)
3)
Press
the
“1,0”
buttons;
remote
control
adjustment
operates
automatically.
(See
Fig.
2-1)
2-1-3
NVRAM
Option
Setting
1)
Press
the
“TEST”
botton
on
VCR
MAIN
PCB
to
set
the
adjustment
mode.
(See
Fig.
2-2)
2)
Press
the
“1,
4”
button
on
the
remote
control.
The
option
setting
appears.
(See
Fig.
2-3)
3)
Select
the
option
number
(See
table
2-1)
of
corresponding
model
with
“<4,
P,
AY”
buttons
on
the
remote
control.
4)
After
selecting
the
option
number
is
completed,
press
the
“
4”
button
of
remote
control.
(If
“
&”
button
is
pressed,
the
selected
number
is
changescolor.
;
See
Fig.
2-4)
5)
Press
the
“ENTER”
button
of
remote
control
again
to
store
the
option
number.
6) Turn the Power off.
01 MAME 04 05 06 Mi 08
09 10 11 12 13 14 15 16
17.18.49 22-93 D4.
D5 26) 27 2829 30° 3h 32
33: 34 35 36 37 38 39 40 |
01 GA GR 04 05 06 Md 08
09
10
11.12
13
14
15 16
“A
Ege
19
29-93:
9A
(25
26
27
28
29
30
31
32
34 35 36 37 38 39 40
MOVE:<> va COMPLET!
Fig.
2-3
Fig,
2-4
<Table 2-1 NVRAM Option Table>
SV-DVD440/XEF
45,6,
7,8,
9,
10,
11,
12,
13, 15,
16,
20,
21,
26,
33,
34,
35,
36,
38,
40,
47,
48, 61,
63, 65, 69,
72
SV-DVD440/XEB
4,5,
6,
7,8,
9,
10,
11,
12,
13,
15,
16,
20, 21, 26,
33,
34,
35,
36,
38,
40, 42,
47, 48,
61, 63,
65,
69,
72
SV-DVD440/XEU
4,5,
6,
7,8,
9,
10,
11,
12,
13,
15,
27,
34, 38,
40, 41,
47,
48,
61,
63,
65, 69,
72
SV-DVD440/XEUI
4,5,
6,7,
8, 9,
10,
11, 12, 13,
15,
25,
26,
34,38,
40,
43,
47,
48,
61,
63, 65, 69,
72
SV-DVD440/XEN,
XEC
|
4,5,6,7,8,9,
10, 11,
12,
13,
15,
16,
34, 36, 38, 40,
42,
47,
48,
61,
63,
65, 69,
72
SV-DVD440/XEE
4,5,
6,7,
8, 9,
10, 11,
12,
13,
15,
16,
34, 36, 38,
40,
42,
47,
48,
61,
63,
65,
69,
72
SV-DVD440/XEG,
COM
|
4,
5,6,
7,9,
10,
11, 12,
13,
15,
16,
34,
36,
38,
40, 42,
47,
48,
61, 63, 65,
69,
72
SV-DVD440/XET
4,5,
6,
7,9,
10,
11,
12,
13,
15,
16,
34,
36, 38, 40,
42, 47, 48,
61,
63,
65,
69,
72
SV-DVD440/EUR,
XEO
|
4,6,
7,8,
9,
10,
11,
12, 13,
15, 16,
17,
20, 33,
34, 36, 38, 42,
47,
48, 61, 63,
65,
69,
72
DVD-V440/FES
6,
7,8,
9,
10,
11,
12, 13,
15,
16, 17, 20,
30,
34,
36, 38, 42,
44,
47,
48,
49,
51,
61,
63,
65,
69
DVD-V440/AFR
6,
7,8,
9,
10,
11,
12,
13, 15, 16, 17, 20,
21,
30,
33,
34,
36, 38, 42,
44,
47, 48,
49,
51,
61,
63,
65,
69
|
oS
a
ee
Samsung
Electronics
2-3

Alignment and Adjustments
2-2-2(b) SKEW Adjustment Method
Needed
to
minimize
the
variations
in
Skew
of
the
Pickup
unit
and
to
provide
optimum
match
with
the
recorded
signal
on
the
Disc.
1)
Connect
an
Oscilloscope
to
the
“Pin
29
of
RIC1”
Test
Point
(See
Fig.
2-5).
2)
Connect
Power,
Open
the
Tray
and
Play
Ch.14
Which
is
in
the
TDV-533
Disc.
@
Set
the
Oscilloscope
Range
as follows
:
(Voltage
;
50mV/Div.,
Frequency
;
10m
Sec.)
3)
Adjust
the
Screws
“A”
and
“B”
(See
Fig.
2-6)
using
a
Hex
screwdriver
until
you
obtain
a
Flat
Waveform
and
the
picture
is
stable.
Then,
go
to
Chapter
1
and
make
sure
the
Waveform
is
Flat
here
as
well.
Tf
not,
you
have
to
go
back
to
Chapter
14
and
adjust
again.
If
you
cannot
obtain
a
Flat
waveform,
then
the
unit
is
defective.
Note
:
The
Deck
must
be
in
a
horizontal
position.
Use
both
“A”
and
“B”
screws
to
adjust.
a et
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Waveform after Correct Adjustment |
Typical Waveform before Adjustment
Fig. 2-7 Envelope Waveform
rs
=
es
2-6
Samsung
Electronics

Alignment and Adjustments
2-3 VCR Mechanical Adjustment
ee
2-3-1
Tape
Transport
System
and
Adjustment
Locations
The
tape
transport
system
has
been
adjusted
precisely
in
the
factory.
Alignment
is
not
necessary
except
for
the
following
:
1) Noise observed on the screen.
2) Tape damage.
3) Parts replacement in the tape transport system.
Lower
flange
height
of
tape
guide
is
used
as
the
reference
for
the
transport
adjustment.
To
maintain
the
height
of
the
tape
guide
and
prevent
damage,
do
not
apply
excessive
force
onto
the
main
base.
CYLINDER ASS'Y
GUIDE ROLLER "S"
(> GUIDE ROLLER "T"
O
O e
FULL
ERASE
HEAD
ce
HEIGHT
SCREW
#3
GUIDE
POST
©
<>
Y
PINCH
ROLLER
TENSION POST TILT SCREW
9) ADJUST SILT
Q
TH SCREW
<
=
nS
CAPSTAN
as ex. #8 GUIDE POST J
AN NIE A oy
SUPPLY
REEL
DISK
TAKE
UP
REEL
DISK
Fig. 2-8 Location of Tape Transport Adjustment
FE
HEAD
CYLINDER
ASS'Y
PINCH
ROLLER
GUIDE ROLLER "S" GUIDE ROLLER "T"
POST TENSION #8 GUIDE POST | #9 GUIDE POST
NNN Sats)
#3
GUIDE
POST
ACE
HEAD
CAPSTAN SHAFT
Fig. 2-9 Tape Travel Diagram
Samsung
Electronics
2-7

Alignment and Adjustments
2-3-2 Tape Transport System Adjustment
When
parts
are
replaced,
perform
the
required
adjustments
by
referring
to
procedures
for
the
tape
transport
system.
If
there
are
any
changes
to
the
tape
path,
first
run
a
T-120
tape
and
make
sure
excessive
tape
wrinkle
does
not
occur
at
the
tape
guides.
¢
If
tape
wrinkle
is
observed
at
the
guide
roller
S,
T,
turn
the
guide
roller
S,
T
until
wrinkle
disappears.
¢
If
the
tape
wrinkle
is
still
observed
at
the
tape
guide,
perform
the
tilt
adjustment
of
the
ACE
head.
(1) ACE Head Assembly Adjustment
a. ACE HEAD HEIGHT ADJUSTMENT
1)
Run
the
alignment
tape
(Color
bar)
in
the
playback
mode.
2) Observe surface of the audio head using a dental mirror.
3)
Turn
screw
(C)
clockwise
or
counterclockwise
until
the
gap
of
lower
tape
edge
and
the
lower
edge
of
the
control
head
is
about
0.25mm.
(Refer
to
Fig.
2-10
and
2-11)
SCREW
(A)
SCREW
(C}
TLIT
ADJUST
HEIGHT
ADJUST
X-POSITION Bre
ADJUSTING SLIT
SCREW (B) SCREW (D}
AZIMUTH
ADJUST
X-POSITION
LOCKING
Fig. 2-10 Location of ACE Head Adjustment Screw
AUDIO HEAD
VIDEO HEAD
CONTROL HEAD
Fig. 2-11 ACE Head Height Adjustment
OO.
.:1.20O_
o_O
2-8
Samsung
Electronics