Samsung TW14C52S/BWT User manual

Television Video Cassette Recorder
Chassis : C15A
Model: TW14C52S/BWT
Television Video Cassette Recorder CONTENTS
Precautions
Specifications
Disassembly and Reassembly
Alignment and Adjustment (Mechanical)
Alignment and Adjustment (Electrical)
Troubleshooting
Exploded View and Parts List
Electric Parts List
Block Diagram
PCB Layout
Wiring Diagram
Schematic Diagrams
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.

1. Precautions
1-1 Safety Precautions
1. Be sure that all of the built-in protective
devices are replaced. Restore any missing
protective shields.
2. When reinstalling the chassis and its
assemblies, be sure to restore all protective
devices, including: nonmetallic control knobs
and compartment covers.
3. Make sure that there are no cabinet openings
through which peopleÑparticularly
childrenÑmight insert fingers and contact
dangerous voltages. Such openings include
the spacing between the picture tube and the
cabinet mask, excessively wide cabinet
ventilation slots, and improperly fitted back
covers.
If the measured resistance is less than 1.0
megohm or greater than 5.2 megohms, an
abnormality exists that must be corrected
before the unit is returned to the customer.
4. Leakage Current Hot Check (Figure 1-1):
Warning: Do not use an isolation
transformer during this test. Use a leakage-
current tester or a metering system that
complies with American National Standards
Institute (ANIS C101.1, Leakage Current for
Appliances), and Underwriters Laboratories
(UL Publication UL1410, 59.7).
5. With the unit completely reassembled, plug
the AC line cord directly into the power
outlet. With the unitÕs AC switch first in the
ON position and then OFF, measure the
current between a known earth ground (metal
water pipe, conduit, etc.) and all exposed
metal parts, including: antennas, handle
brackets, metal cabinets, screwheads and
control shafts. The current measured should
not exceed 0.5 milliamp. Reverse the power-
plug prongs in the AC outlet and repeat the
test.
Fig. 1-1 AC Leakage Test
6. Antenna Cold Check:
With the unitÕs AC plug disconnected from the
AC source, connect an electrical jumper across
the two AC prongs. Connect one lead of the
ohmmeter to an AC prong. Connect the other
lead to the coaxial connector.
7. X-ray Limits:
The picture tube is especially designed to pro-
hibit X-ray emissions. To ensure continued
X-ray protection, replace the picture tube only
with one that is the same type as the original.
Carefully reinstall the picture tube shields and
mounting hardware; these also provide X-ray
protection.
8. High Voltage Limits:
High voltage must be measured each time ser-
vicing is done on the B+, horizontal deflection
or high voltage circuits. Correct operation of
the X-ray protection circuits must be
reconfirmed whenever they are serviced.
(X-ray protection circuits also may be called
Òhorizontal disableÓ or Òhold-downÓ.)
Heed the high voltage limits. These include
the XÐray Protection Specifications Label, and
the Product Safety and X-ray Warning Note on
the service data schematic.
Precautions
Samsung Electronics 1-1
LEAKAGE
CURRENT
TESTER
DEVICE
UNDER
TEST TEST ALL
EXPOSED METAL
SURFACES
2-WIRE CORD
ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED) EARTH
GROUND
(READING SHOULD
NOT BE ABOVE
0.5mA)
Follow these safety, servicing and ESD precautions to prevent damage and protect against potential
hazards such as electrical shock and X-rays.

1-1 Safety Precautions (Continued)
9. High voltage is maintained within specified
limits by close-tolerance, safety-related
components and adjustments. If the high
voltage exceeds the specified limits, check
each of the special components.
10. Design Alteration Warning:
Never alter or add to the mechanical or
electrical design of this unit. Example: Do not
add auxiliary audio or video connectors. Such
alterations might create a safety hazard. Also,
any design changes or additions will void the
manufacturerÕs warranty.
11. Hot Chassis Warning:
Some TV receiver chassis are electrically
connected directly to one conductor of the AC
power cord. If an isolation transformer is not
used, these units may be safely serviced only
if the AC power plug is inserted so that the
chassis is connected to the ground side of the
AC source.
To confirm that the AC power plug is inserted
correctly, do the following: Using an AC
voltmeter, measure the voltage between the
chassis and a known earth ground. If the
reading is greater than 1.0V, remove the AC
power plug, reverse its polarity and reinsert.
Re-measure the voltage between the chassis
and ground.
12. Some TV chassis are designed to operate with
85 volts AC between chassis and ground,
regardless of the AC plug polarity. These units
can be safely serviced only if an isolation
transformer inserted between the receiver and
the power source.
13. Some TV chassis have a secondary ground
system in addition to the main chassis ground.
This secondary ground system is not
isolated from the AC power line. The two
ground systems are electrically separated by
insulating material that must not be defeated
or altered.
14. Components, parts and wiring that appear to
have overheated or that are otherwise
damaged should be replaced with parts that
meet the original specifications. Always
determine the cause of damage or overheat-
ing, and correct any potential hazards.
15. Observe the original lead dress, especially
near the following areas: Antenna wiring,
sharp edges, and especially the AC and high
voltage power supplies. Always inspect for
pinched, out-of-place, or frayed wiring. Do
not change the spacing between components
and the printed circuit board. Check the AC
power cord for damage. Make sure that leads
and components do not touch thermally hot
parts.
16. Picture Tube Implosion Warning:
The picture tube in this receiver employs
Òintegral implosionÓ protection. To ensure
continued implosion protection, make sure
that the replacement picture tube is the same
as the original.
17. Do not remove, install or handle the picture
tube without first putting on shatterproof
goggles equipped with side shields. Never
handle the picture tube by its neck. Some
Òin-lineÓ picture tubes are equipped with a
permanently attached deflection yoke; do not
try to remove such Òpermanently attachedÓ
yokes from the picture tube.
18. Product Safety Notice:
Some electrical and mechanical parts have
special safety-related characteristics which
might not be obvious from visual inspection.
These safety features and the protection they
give might be lost if the replacement compo-
nent differs from the originalÑeven if the
replacement is rated for higher voltage,
wattage, etc.
Components that are critical for safety are
indicated in the circuit diagram by shading,
( ) or ( ).
Use replacement components that have the
same ratings, especially for flame resistance
and dielectric strength specifications.
A replacement part that does not have the
same safety characteristics as the original
might create shock, fire or other hazards.
Precautions
1-2 Samsung Electronics
!

1-2 Servicing Precautions
1. Servicing precautions are printed on the
cabinet. Follow them.
2. Always unplug the unitÕs AC power cord from
the AC power source before attempting to: (a)
Remove or reinstall any component or
assembly, (b) Disconnect an electrical plug or
connector, (c) Connect a test component in
parallel with an electrolytic capacitor.
3. Some components are raised above the printed
circuit board for safety. An insulation tube or
tape is sometimes used. The internal wiring is
sometimes clamped to prevent contact with
thermally hot components. Reinstall all such
elements to their original position.
4. After servicing, always check that the screws,
components and wiring have been correctly
reinstalled. Make sure that the portion around
the serviced part has not been damaged.
5. Check the insulation between the blades of the
AC plug and accessible conductive parts
(examples: metal panels, input terminals and
earphone jacks).
6. Insulation Checking Procedure: Disconnect the
power cord from the AC source and turn the
power switch ON. Connect an insulation
resistance meter (500V) to the blades of the AC
plug.
The insulation resistance between each blade
of the AC plug and accessible conductive parts
(see above) should be greater than 1 megohm.
7. Never defeat any of the B+ voltage interlocks.
Do not apply AC power to the unit (or any of
its assemblies) unless all solid-state heat sinks
are correctly installed.
8. Always connect a test instrumentÕs ground
lead to the instrument chassis ground before
connecting the positive lead; always remove
the instrumentÕs ground lead last.
Precautions
Samsung Electronics 1-3
Warning1: First read the “Safety Precautions” section of this manual. If some unforeseen circumstance creates a conflict between
the servicing and safety precautions, always follow the safety precautions.
Warning2: An electrolytic capacitor installed with the wrong polarity might explode.

1. Some semiconductor (Òsolid stateÓ) devices
are easily damaged by static electricity. Such
components are called Electrostatically
Sensitive Devices (ESDs); examples include
integrated circuits and some field-effect
transistors. The following techniques will
reduce the occurrence of component damage
caused by static electricity.
2. Immediately before handling any semicon
ductor components or assemblies, drain the
electrostatic charge from your body by
touching a known earth ground. Alternatively,
wear a discharging wrist-strap device. (Be
sure to remove it prior to applying powerÑ
this is an electric shock precaution.)
3. After removing an ESD-equipped assembly,
place it on a conductive surface such as
aluminum foil to prevent accumulation of
electrostatic charge.
4. Do not use freon-propelled chemicals. These
can generate electrical charges that damage
ESDs.
5. Use only a grounded-tip soldering iron when
soldering or unsoldering ESDs.
6. Use only an anti-static solder removal device.
Many solder removal devices are not rated as
Òanti-staticÓ; these can accumulate sufficient
electrical charge to damage ESDs.
7. Do not remove a replacement ESD from its
protective package until you are ready to
install it. Most replacement ESDs are
packaged with leads that are electrically
shorted together by conductive foam,
aluminum foil or other conductive materials.
8. Immediately before removing the protective
material from the leads of a replacement ESD,
touch the protective material to the chassis or
circuit assembly into which the device will be
installed.
9. Minimize body motions when handling
unpackaged replacement ESDs. Motions such
as brushing clothes together, or lifting a foot
from a carpeted floor can generate enough
static electricity to damage an ESD.
Precautions
1-4 Samsung Electronics
1-3 Precautions for Electrostatically Sensitive Devices (ESDs)

Samsung Electronics 2-1
2. Specifications
TELEVISION PART
Colour systems PAL(option) / SECAM(option) (UK;PAL)
TV standards L/L’(option), B/G(option), D/K(option) (UK;I)
Number of channels 100 programmes
Reception range/cable TV Hyperband/interband tuner
Aerial input 75 Ohms, coaxial cable
VCR PART
Format VHS standard
(PAL / SECAM(option) / MESECAM(option) / NTSC in playback only)
Heads Video: 2 rotary heads, LP(option), 4 Heads(option)
Audio/Control: 1 stationary head (linear)
Erase: 1 full track erase head
Luminance FM azimuth recording
Colour Down converted subcarrier phase shifted direct recording
FF/REW time Less than 100 seconds in FF with E-120
Wow and flutter (WTD) 0.4% maximum (SP)
Frequency response 100 Hz - 8 KHz
GENERAL
Power supply 220-240V~, 50Hz (110-260V~, 50/60Hz; option)
Consumption 14” (60W)
20”/21” (90W)
Audio output power 14” (1.5W)
20” (3W)
21” (1.5Watts x 2)
Number of loudspeakers 14”/20” (1)
21” (2)
Tube size 14” (37cm/34cmV)
20” (51cm/48cmV)
21” (55cm/51cmV)
Tube type BLACK MATRIX
Sockets 1 full RGB SCART on the rear
1 RCA input (audio and video) on the front
Earphones output (3.5 mm mini-jack)
1 aerial/cable TV coaxial input
Dimensions (W x D x H) 14” (368.5 x 388 x 381)
20” (488 x 477 x 488)
21” (520 x 495 x 508)
Weight 14” (11.7 kg)
20” (20.4 kg)
21” (23.2 kg)
Operating temperature 5°C - 40°C (41°F - 104°F)
Relative humidity 10% - 75%
T he descriptions and characteristics given in this booklet are given for information
purposes only and are subject to modification without notice.

Disassembly and Reassembly
Samsung Electronics 3-1
1. Remove the screws located on the side of the back cover.
3. Disassembly and Reassembly
3-1 Disassembly
3-1-1 Back Cover Removal

Disassembly and Reassembly
3-2 Samsung Electronics
3-1-2 Main Assembly Removal
1. Release two connectors between sub PCB and Main Assembly.
2. Pull the Main Assembly backwards to remove.

Disassembly and Reassembly
Samsung Electronics 3-3
3-1-3 Monitor Frame Removal
1. Remove 3 screws from the Main Assembly. Remove the dust cover.
2. Remove 4 screws from the Deck Assembly.

Disassembly and Reassembly
3-4 Samsung Electronics
3-1-4 Deck Assembly Removal 3-1-5 Main Assembly Removal
1. Remove 2 screws holding the bottom cover.
2. Remove one screw from Main PCB
Assembly. Take off the deck Assembly.
1. Remove 2 screws holding the upper chassis
housing.
2. Remove 3 screws holding the deck assembly.
3. Lift the deck assembly upward to remove.

Disassembly and Reassembly
Samsung Electronics 3-5
3-1-6 Top Cabinet Removal
1. Remove two (2) screws located at the rear of
the top cabinet.
2. Carefully lift the back of the top cabinet and
shield it to the rear to remove.
3-1-7 Top Cabinet Removal 3-1-8 Top Cabinet Removal

Samsung Electronics 4-1
4-1 Deck Parts Locations
4-1-1 Deck (Top View)
Œ´ˇ
¨ˆØ∏
Fig. 4-1 Top parts Location-1
4. Alignments and Adjustments (Mechanical)
ŒBRACKET FL TOP
´GEAR FL CAM
ˇMOTOR LOADING ASS’Y
¨LEVER FL ARM ASS’Y
ˆHOLDER FL CASSETTE ASS’Y
ØLEVER FL DOOR
∏SLIDER FL DRIVE

4-1-2 Deck (Top View)
Alignments and Adjustments (Mechanical)
4-2 Samsung Electronics
Œ´ˇ ¨ˆØ∏”
’˝ÔÒÚÆı
Ò
Fig. 4-2 Top Parts Location-2
ŒFE HEAD
´PLATE CYLINDER C
ˇCYLINDER ASS’Y
¨PLATE CYLINDER B
ˆPLATE CYLINDER A
ØACE HEAD ASS’Y
∏UNIT PINCH ASS’Y
”LEVER #9 GUIDE ASS’Y
’LEVER TENSION ASS’Y
˝BAND BRAKE ASS’Y
ÔDISK S REEL
LEVER S BRAKE ASS’Y
ÒGEAR IDLE
ÚLEVER IDLE
ÆLEVER T BRAKE ASS’Y
ıDISK T REEL

Alignments and Adjustments (Mechanical)
Samsung Electronics 4-3
4-1-3 Deck (Bottom View)
Œ´ˇ¨ˆØ∏
”’˝ Ô
Fig. 4-3 Bottom Parts Location
ŒGEAR JOINT 1
´GEAR JOINT 2
ˇBRAKET GEAR
¨MOTOR CAPSTAN ASS’Y
ˆLEVER T LOAD ASS’Y
ØGEAR LOADING DRIVE
∏LEVER S LOAD ASS’Y
”HOLDER CLUTCH ASS’Y
’BELT PULLEY
˝SLIDER CAM
ÔSLEEVE TENSION

Alignments and Adjustments (Mechanical)
4-4 Samsung Electronics
4-2 Main Deck
4-2-1 Braket FL Top Removal
1. Remove 2 screws Œ.
2. Remove the Bracket FL Top ´.
Note : Take care not to change assembly direction.
FIG.1
Π2 SCREWS
´ BRACKET FL TOP
4-2-2 Lever FL Door Removal
1. Rotate the Lever FL Door Œin the direction of
arrow ÒAÓ.
2. Release the Hook ´, remove the Lever FL Door
Œin the direction of arrow ÒBÓ.
´HOOK
ΠLEVER FL DOOR
"A"
"B"
Fig. 4-4 Braket FL Top Removal Fig. 4-5 Lever FL Door Removal

Alignments and Adjustments (Mechanical)
Samsung Electronics 4-5
4-2-3 Holder FL Cassette Ass’y Removal
1. Remove the Lever FL Door. (Refer to Fig. 4-5
2. Pull the Holder FL Cassette AssÕy Œto the eject
position.
3. Pull the Holder FL Cassette AssÕy Œ as grasping
the Holder FL Cassette AssÕy Œ and Lever FL
Cassette-R ´ in the same time to release hooking
from Main Base until the Boss [A], [B] of Holder
FL Cassette AssÕy Œ is taken out from the Rail [C],
[D].
4. Lift the Holder FL Cassette AssÕy Œin the direc-
tion of arrow ÒBÓ in this time, you have to grasp
the Lever FL Cassette-R ´ continuously until the
Holder FL Cassette AssÕy Œ is taken out completely.
Note : Be sure to insert Lever FL Cassette-R ´ in the
direction of ÒAÓ to prevent separation and break-
age of the Lever FL Cassette-R ´ at disassembling
and reassembling.
ΠHOLDER FL
CASSETTE ASS'Y
´ LEVER FL CASSETTE-R
BOSS [A]
BOSS [B]
RAIL [C]
RAIL [D]
"A"
"B"
4-2-4 Lever FL Arm Ass’y Removal
1. Remove the Lever FL Door. (Refer to Fig. 4-5
2. Remove the Holder FL Cassette AssÕy.
(Refer to Fig.4-6)
3. Release the Hook Œin the direction of arreow
ÒAÓ, pull out the Lever FL Arm AssÕy ¨from
the Boss of Main Base.
4. Remove the Lever FL Arm AssÕy ¨in the direc-
tion of arrow ÒBÓ.
Assembly : When reinstalling, be sure to reassemble
Lever FL Arm AssÕy ¨ after you insert the Boss
´in Groove [A] of Slider FL Drive ˇ.
ΠHOOK
´ BOSS
¨ LEVER FL
ARM ASS'Y
ˇ SLIDER FL DRIVE
GROOVE [A]
"A"
"B"
Fig. 4-6 Holder FL Cassette Ass’y Removal Fig. 4-7 Lever FL Arm Ass’y Removal

Alignments and Adjustments (Mechanical)
4-6 Samsung Electronics
4-2-5 Slider FL Drive Removal
1. Pull the Slider FL Drive Œto the front direction.
2. Remove the Slider FL Drive Œin the direction of arrow. (Refer to Fig. 4-8)
ΠSLIDER FL DRIVE
4-2-6 Bracket Gear, Gear FL Cam, Gear Joint 1, 2 Removal
1. Remove screw Œ.
2. Lift the Bracket Gear ´.
3. Remove the Gear FL Cam ˇ.
4. Lift the Gear Joint 2 ¨, Gear Joint 1 ˆ.
ΠSCREW
´ BRACKET GEAR
ˇ GEAR FL CAM
ˆ GEAR JOINT 1
¨ GEAR JOINT 2
Fig. 4-8 Slider FL Drive Removal
Fig. 1-9 Bracket Gear, Gear FL Cam, Gear Joint 1, 2 Removal

Alignments and Adjustments (Mechanical)
Samsung Electronics 4-7
4-2-7 Assembly of Gear FL Cam,
Gear Joint 1, 2
1. Be sure to align dot mark of Gear Joint 1 Πwith
dot mark of Gear Joint 2 ´ as shown Fig. 4-10
(Refer to Timing Point 1), confirm the Timing
Point 2 of the Gear Joint 2 ´ and Slider Cam ˇ.
2. Align the Gear FL Cam ¨with the Gear Worm
Wheel Post as shown detail drawing. (Refer to
Timing Point 3)
ŒGEAR JOINT 1
´GEAR JOINT 2
ˇSLIDER CAM
TIMING POINT 1
¨GEAR FL CAM
GEAR WORM WHEEL
POST
TIMING POINT 2
TIMING POINT 3
4-2-8 Holder Worm, Gear Worm,
Gear Worm Wheel Removal
1. Release the Hook [A] in the direction of arrow
and, remove the Holder Worm Œ.
2. Remove the Gear Worm ´.
3. Remove the Gear Worm Wheel ˇ. (After remov-
ing the Gear FL Cam as shown Fig. 4-9)
Note : Secure the Hook [A] after installing the
Holder Worm Œ.
ΠHOLDER WORM
´ GEAR WORM
HOOK [A]
ˇ GEAR WORM WHEEL
Fig. 4-10 Assembly of Gear FL Cam, Gear Joint 1,2
Fig. 4-11 Holder Worm, Gear Worm, Gear Worm Wheelemoval

Alignments and Adjustments (Mechanical)
4-8 Samsung Electronics
4-2-9 Motor Loading Ass’y Removal
1. Remove the screw Œ.
2. Remove the Motor Loading AssÕy ´.
ΠSCREW
´ MOTOR LOADING ASS'Y
Fig. 4-12 Motor Loading Ass’y Removal
4-2-10 Gear Loading Drive, Slider Cam, Lever T, S Load Ass’y Removal
1. Remove the Belt Pulley. (Refer to Fig. 4-29)
2 . Remove the Gear Loading Drive Œafter releasing Hook [A] in the direction arrow as shown in detail
drawing.
3. Remove the Slider Cam ´.
4. Remove the Lever T, S Load AssÕy ˇ, ¨.
ΠGEAR LOADING DRIVE
ˇ
LEVER T LOAD ASS'Y
HOOK [A]
´ SLIDER CAM
¨ LEVER S LOAD ASS'Y
Fig. 4-13 Gear Loading Drive, Slider Cam, Lever T, S Load Ass’y Removal

Alignments and Adjustments (Mechanical)
Samsung Electronics 4-9
4-2-11 Assembly of Gear Loading Drive,
Slider Cam, Lever T, S Load Ass’y
1. When reinstalling, be sure to align dot of Lever T
Load AssÕy Œ with dot of Lever S Load AssÕy ´
as shown in drawing. (Refer to Timing Point 1
2. Insert the Pin A, B, C, D into the Slider Cam
ˇhole.
3. Be sure to align dot of Lever T Load AssÕy and dot
of Gear Loading Drive ¨. (Refer to Timing Point 2)
4. Align dot of Gear Loading Drive with mark of
Slider Cam as shown in drawing.
(Refer to Timing Point 3)
´LEVER S LOAD ASS'Y
ŒLEVER T LOAD ASS'Y
PIN A PIN C PIN B
PIN D
LEVER T
LOAD ASS'Y LEVER S
LOAD ASS'Y
ˇSLIDER CAM
¨GEAR LOADING DRIVE
TIMING POINT 1
TIMING POINT 2
TIMING POINT 3
4-2 -12 Lever Tension Ass’y, Band Brake
Ass’y, Sleeve Tension Removal
1 . Remove the Spring Tension Π.
2 . In bottom side of Deck, remove the Sleeve
Tension ´ after rotating it right or left as lif-
tinig locking edge of Sleeve Tension.
3 . Remove the side ÒaÓ of the Band Brake
AssÕy ¨ in the direction of arrow ÒAÓ from the
Lever Tension AssÕy ˇ .
4 . Remove the side ÒbÓ of the Band Brake
AssÕy ¨ in the direction of arrow ÒBÓ from the
Main Base.
Note :
1 . When replacing the Lever Tension AssÕy, be
sure to apply oil in the Sleeve Tension.
2 . Take care not to touch stain on the felt side,
and not to be folded and broken Band Brake
AssÕy.
¨ BAND BRAKE ASS'Y
´ SLEEVE TENSION
ˇ LEVER TENSION ASS'Y
ΠSPRING TENSION
"A"
"B" a
b
Fig. 4-14 Assembly of Gear Loading Drive,
Slider Cam, Lever T, S Load Ass’y
Fig. 4-15 Lever Tension Ass’y, Band Brake Ass’y, Sleeve Tension
Removal