SAMSUNG SVA20XKSEC Service Manual

VIDEO CASSETTE RECORDER

SV-A20XK/SV-200X SV-A21XK/SV-201X SV-A30XK/SV-203X SV-A40XK/SV-205X

SERVICE

SV-A20XK/SV-A21XK/SV-A30XK

SV-200X/SV-201X/SV-203X

SV-A40XK/SV-205X

Manual

VIDEO CASSETTE RECORDER CONTENTS

PAL

For mechanical disassembly and adjustment, refer to the “Mechanical Manual” (DX7-R/RC, DX8-R/RC AC68-20316A).

1. Precautions

2. Reference Information

3. Product Specifications and Comparison Chart

4. Disassembly and Reassembly

5. Alignment and Adjustment

6. Exploded View and Parts List

7. Electrical Parts List

8. Block Diagrams

9. PCB Diagrams

10. Wiring Diagram

11. Schematic Diagrams

Samsung Electronics 1-1

1. 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 pretective devices, including : control knobs and compartment covers.

3. Make sure that there are no cabinet openings through which people--particularly children

--might 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 (See Fig. 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 (ANSI 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 the power outlet. With the unitÕs AC switch first in the ON position and then OFF, measure the current between a known erath 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.

6. X-ray Limits : The picture tube is designed to prohibit X-ray emissions. To ensure continued X-ray protection, replace the picture tube only with one that is the same type as the original.

Fig. 1-1 AC Leakage Test

7. 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.

8. High Voltage Limit : High voltage must be measured each time servicing is done on the B+, horizontal deflection or high voltage circuits.

Heed the high voltage limits. These include the

X-ray protection Specifications Label, and the Product Safety and X-ray Warning Note on the

service data schematic.

9. 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.

10. Immediately before handling sny semiconductor

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 power--this is an electric shock precaution.)

Device Under

Test

(Reading should not be above

0.5mA) Leakage

Currant Tester

Earth Ground

Test all

exposed metal

surfaces

Also test with plug reversed (using AC adapter plug as required)

2-Wire Cord

Precautions

1-2 Samsung Electronics

11. 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.

12. 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.

13. 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.

14. 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.

15. 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.

16. Always connect a test instrumentÕs ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrumentÕs ground lead last.

17. 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, outof-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.

18. 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.

19. 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.

20. 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 component differs from the original--even 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.

Samsung Electronics 2-1

2. Reference Information

2-1 Servicing Jigs and Special Tools

1. For this VCR chassis, the program switch and the sensors (start/end/reel) are located on the main PCB, not on the deck assÕy.

2. As long as the deck assÕy is connected to the main PCB, all repairs are possible. Important : In order to repair the main PCB without the deck assÕy connected, the X-5 chassis jig should be used.

3. To emulate the function of the sensors, connect a jumper or solder land (two point) at service option(W750) on the function-timer PCB.

4. The X-5 chassis jig can be used for the following :

1) When repairing or confirming the operation of the deck assÕy.

2) When replacing or repairing the components located under the deck assÕy.

3) When repairing the function PCB.

5. The X-5 chassis jig can not be used for the following :

1) Repairing defects in the video section.

2) Repairing defects in the audio section.

3) If the defect is related to tape speed.

Note :

1) Repair may not be possible if there is external noise between the deck assÕy and main PCB.

2) If tape control signal is not connected to the jig, the VCR must be operated in SP mode.

2-1-1 Servicing guide

X-5 Chassis Jig

Jig Item

68140-500-013

Part No.

Connects the deck ass’y to the main PCB connecting cable.

Use

2-1-2 Servicing Jig

Reference Information

2-2 Samsung Electronics

2-1-4 How to Connect X-5 chassis jig

4. Insert wafers of drum motor, capstan motor and loading motor on X-5 chassis jig into each of the connectors of deck assÕy, and then secure with three screws.

5. Solder the 3 leads of the jig cable to ÒCN605Ó on the main PCB.

6. Apply power to the function PCB.

7. Insert a test tape into the housing assÕy.

8. Simultaneously touch the start and end sensor LEDs on the PCB, so that the tape loads automatically. After the tape is loaded, all of the function buttons on the function PCB can be used.

9. If the test tape is ejected while the jig is in use, attempt to re-load the tape by simultaneously touching the start and end sensor LEDs. If the tape still does not load, reset the function PCB by pressing SW715.

Note : After completing repairs, SW715 on the function PCB in order to reset.

1. Unplug the power cord from AC outlet.

2. Remove the deck assÕy from main PCB (See Page 4-5 of service manual).

3. To emulate the function of the sensors, place a jumper or solder land (two point) at service option(W750) on the function-timer PCB. (see diagram below).

Function-Timer (Component side)

SV-A20XK/SV-200X SV-A21XK/SV-201X SV-A30XK/SV-203X

SV-A40XK/SV-205X

Reference Information

Samsung Electronics 2-3

CONNECTS TO THE ASS'Y MAIN CN604.

CONNECTS TO THE ASS'Y MAIN CN605.

CONNECTS TO THE ASS'Y MAIN CN603.

CONNECTS TO THE ASS'Y MAIN CN601.

CONNECTS TO THE DRUM MOTOR CONNECTOR OF ASS'Y FULL DECK.

CONNECTS TO THE CAPSTAN MOTOR CONNECTOR OF ASS'Y FULL DECK.

CONNECTS TO THE LOADING MOTOR CONNECTOR OF ASS'Y FULL DECK.

ASS'Y FULL DECK

ASS'Y MAIN

1 SCREW (1-3X10)

2 SCREWS (2-3X10)

CN604

CN603

CN605

CN601

How to Connect X-5 chassis jig

Reference Information

2-4 Samsung Electronics

2-2 IC BLOCK

2-2-1 IC601 (HD6473977)

Reference Information

Samsung Electronics 2-5

2-2-2 IC301 (SS11501M)

Reference Information

2-6 Samsung Electronics

2-2-3 IC302 (LA7411)

Reference Information

Samsung Electronics 2-7

2-2-4 IC303 (SS23478M)

Reference Information

2-8 Samsung Electronics

2-2-5 IC401 (TDA9800)

Reference Information

Samsung Electronics 2-9

2-2-6 IC801 (KA8119)

Reference Information

2-10 Samsung Electronics

MEMO

Samsung Electronics 3-1

3. Product Specifications and Comparison Chart

3-1 Product Specifications

Operation Description

Format VHS PAL/MESECAM standard Heads Video : 2 rotary heads

Audio/Control : 1 stationary head

Erase : 1 full track erase head Receiving channel VHF-I, VHF-III, UHF, Hyperband Television system STANDARD B/G Luminance FM azimuth recording Colour system PAL/MESECAM : Down converted subcarrier phase shifted direct recording

NTSC PB on PAL TV Tape speed SP : 23.39 mm/sec Recording/playback time SP : 3 hours (E-180 Tape) F.F/REW time About 100-190 sec in REW/F.F with E-180 VIDEO Input 0.5 to 2.0 Vp-p : 75 ohm unbalanced

Output 1.0 ± 0.2 Vp-p : 75 ohm unbalanced Signal-to-noise ratio Better than 43 dB (SP) Horizontal resolution More than 240 lines (SP)

Audio Input -8 dBm, 47 Kohm unbalanced

Output -8 ± 3 dBm, 1 Kohm unbalanced Wow and flutter (WTD) 0.4% max (SP) Signal-to-noise ratio 42 dB min (IHF A filter) Frequency response 100Hz-8KHz

Power requirement 230V (AC 50/60 Hz) Power consumption Approx. 18 watts Operation temperature 41°F-104°F (5°C-40°C) Operation humidity 10%-75% Weight 4.4 Kg (net) Dimensions (W x H x D) 380 x 90.5 x 310 mm

Design and specifications are subject to change without notice.

Product Specifications

3-2 Samsung Electronics

3-2 Comparison Chart

SV-A20XK/EDI (SV-200X) X X X X X X X X 1 SCART X X SV-A20XK/NSI (SV-200X) X X X X X X X X 1 SCART X X SV-A20XK/AMF (SV-200X) X X X X X X X X 1 SCART X X SV-A20XK/SEI (SV-200X) X X X X X X X X 1 SCART X X SV-A20XK/SEC (SV-200X) X X X X X X X X 1 SCART X X SV-A21XK/SEI (SV-201X) X X X X X X X X 2 SCART CANAL+ O SV-A21XK/SEC (SV-201X) X X X X X X X X 2 SCART CANAL+ O SV-A30XK/SEG (SV-203X) X X O X O O O X 1 SCART X X SV-A40XK/EDI (SV-205X) O O X O O O O O 2 SCART CANAL+ O SV-A40XK/NSI (SV-205X) O O X O O O O O 2 SCART CANAL+ O SV-A40XK/AMF (SV-205X) O O X O O O O O 2 SCART CANAL+ O SV-A40XK/SEI (SV-205X) O O X O O O O O 2 SCART CANAL+ O SV-A40XK/SEC (SV-205X) O O X O O O O O 2 SCART CANAL+ O SV-A40XK/SEG (SV-205X) O O O X O O O O O P/MIERE O

FUNCTION

MODEL

SHUTTLE

AUDIO

DUBBING

VPS

PDC

SHOW

VIEW

ATS

AUTO

CLOCK

FRONT

A/V

REAR

JACK

CANAL+ P/MIERE

VCR/

REMARK

Samsung Electronics 4-1

4. Disassembly and Reassembly

4-1 Cabinet Assembly

Note : Disassemble in the order shown.

Reassemble in reverse order.

4-1-1 Cabinet Top removal

REMOVE 5 SCREWS

1. Remove 5 screws and slide the top cabinet to the rear to remove.

Fig. 4-1 Cabinet Top removal

Disassembly and Reassembly

4-2 Samsung Electronics

4-1-2 Bottom cover removal

1. Remove 2 screws.

2. Lift up the bottom cover toward arrow ÒAÓ.

Fig. 4-2 Bottom Cover removal

"A"

REMOVE 2 SCREWS (BH;1-3X12 YELLOW)

Lift up the bottom cover in the direction of arrow "A".

REMOVE 2 SCREWS (BH;1-3X12 YELLOW)

"A"

Lift up the bottom cover in the direction of arrow "A".

SV-A20XK/SV-200X SV-A21XK/SV-201X SV-A30XK/SV-203X

SV-A40XK/SV-205X

Disassembly and Reassembly

Samsung Electronics 4-3

4-1-3 Ass’y Front Panel removal

(Bottom view)

RELEASE 4 HOOKS

REMOVE KNOB-SHUTTLE

RELEASE 3 HOOKS

1. Remove the knob-shuttle.

2. Release 4 hooks on the top side and 3 hooks on the bottom side and then, pull the assÕy front panel to remove.

(Top view)

Fig. 4-3 Ass’y Front Panel removal

Disassembly and Reassembly

4-4 Samsung Electronics

4-1-4 Ass’y Function-Timer removal

1. Release 5 hooks and remove the assÕy function-timder.

Note : Take extreme care not to damage the PCB when removing it.

Fig. 4-4 Ass’y Function-Timer removal

RELEASE 5 HOOKS

SV-A20XK/SV-200X SV-A21XK/SV-201X SV-A30XK/SV-203X

SV-A40XK/SV-205X

Disassembly and Reassembly

Samsung Electronics 4-5

4-1-5 Chassis removal

REMOVE 2 SCREWS (BH;2-3X12 YELLOW)

RELEASE 1 TAB

RELEASE 1 HOOK

CONNECTOR BOARD ASS'Y

ASS'Y MAIN

ASS'Y FULL DECK

BOTTOM COVER

FRAME

1. Remove 2 screws holding the bottom cover.

2. Remove 2 screws holding the frame.

3. Remove 2 screws holding the housing assÕy.

4. Remove 2 screws holding the assÕy full deck.

5. Lift the assÕy full deck up.

6. Release 1 tab holding the connector board assÕy.

7. Release 1 hook holding the assÕy main.

8. Lift the assÕy main up to remove.

Note : 1. When removing chassis, take extreme care not to damage the main PCB front.

2. When reinstalling the deck on the main PCB, take extreme care not to damage the sensor.

Fig. 4-5 Chassis Removal

Disassembly and Reassembly

4-6 Samsung Electronics

4-2 Circuit Board Locations

ASS'Y MAIN BOARD

ASS'Y FUNCTION-TIMER BOARD

Fig. 4-6 Circuit Board Locations

SV-A20XK/SV-200X SV-A21XK/SV-201X SV-A30XK/SV-203X

Disassembly and Reassembly

Samsung Electronics 4-7

ASS'Y MAIN BOARD

ASS'Y FUNCTION-TIMER BOARD

Fig. 4-6 Circuit Board Locations

SV-A40XK/SV-205X

Disassembly and Reassembly

4-8 Samsung Electronics

MEMO

Samsung Electronics 5-1

5. Alignment and Adjustment

Note : After replacing the assÕy full deck, the assÕy main, the cylinder assÕy and the micom(IC601), the remote

control assÕy can be used to adjust the ÒX-point (tracking center) adjustmentÓ and ÒHead S/W pointÓ adjustment.

5-1 Reference

5-1-1 The type of remote control ass’y

1. Remote control assÕy (AC93-10039Y/69099-633-252) is specified as a service jig in the service manual of X-5/X-6(DX5-R/DX5-RC/DX6-R/DX6-RC) chassis. (See Fig. 5-1)

2. Normal remote control assÕy for X-7/X-8 (DX7-R/DX7-RC/DX8-R/DX8-RC) chassis. (See Fig. 5-2)

5-1-2 How to identify between normal

remote control ass’y and multi remote control ass’y for X-7/X-8 chassis (See Fig. 5-2)

1. The color of some buttons related to TV function are

gold.

2. Audio button is added instead of the test button hidden behind of inlay.

3. The positions of some buttons are different.

EJECT

45 6

789

CLK/COUNT

REW

F.F

STOP

CLR/RST DISPLAY

Q-PRO

DAILY WEEKLY

REC

P/S

PRESET BAND

SEARCH MEMORY

OUTPUT

INDEX SLOW INPUT

INPUT BUTTON

SP/LP BUTTON

SP LP A.DUB VPS

FINE CH

TRK (TRACKING, FINE) BUTTON

POWER BUTTON

POWER

PLAY BUTTON

PLAY

TEST BUTTON IS HIDDEN BEHIND OF INLAY.

HEAD S/W ADJ. ("INPUT" OR "TEST" AND "3" BUTTON)

TRACKING CENTER ADJ. ("INPUT" OR "TEST" AND "1" BUTTON)

633-252

REMOTE CONTROL ASS'Y PART NO.

Fig. 5-1 Remote Control Ass’y Jig for X-5/X-6 Chassis

(AC93-10039Y/69099-633-252)

EJECT

45 6

789

CLK/COUNT

REW

F.F

STOP

AUDIO

DISPLAY

REC

P/S

INDEX A.TRK

INPUT BUTTON

FINE PROG

TRK (TRACKING, FINE) BUTTON

POWER BUTTON

POWER

PLAY BUTTON

PLAY

TEST BUTTON IS HIDDEN BEHIND OF INLAY.

HEAD S/W ADJ. ("INPUT" OR "TEST" AND "3" BUTTON)

TRACKING CENTER ADJ. ("INPUT" OR "TEST" AND "1" BUTTON)

SYSTEM

CLR/RST

SPEED BUTTON

SPEED AFT

INPUT

TV/VCR

PICTURE

A.DUB

45 6

789

CLK/COUNT

REW

F.F

STOP

DISP./

REC

P/S

INDEX

VCR

POWER

PLAY

VCR

CLR/RST

SPEED

TV/VCR

PICTURE

A.DUB

NORMAL REMOTE CONTROL ASS'Y

(CAN ADJUST)

MULTI REMOTE CONTROL ASS'Y

(CAN NOT ADJUST)

-/--

FINE

AUDIO

ADD BUTTON(AUDIO)

GOLD COLOR

POWER

INPUT

GOLD COLOR

VOLUME PROG

GOLD COLOR

Q-PRO

SLOW

SOFTEN OK SHARPEN

Q-PRO

SLOW

SOFTEN OK SHARPEN

Fig. 5-2 Remote Control Ass’y for X-7/X-8 Chassis

+ 53 hidden pages