SAMSUNG SVA17GV Service Manual

VIDEO CASSETTE PLAYER VIDEO CASSETTE LINE RECORDER

SV-A17GV/SVK-A17GV SV-8A/SV-9AK SV-66H/SV-66HK SVR-77H

Manual

SERVICE

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

VIDEO CASSETTE PLAYER/VIDEO CASSETTE LINE RECORDER

1. Precautions

2. Reference Information

CONTENTS

PAL NTSC

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

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).

(Reading should not be above

Device Under 

Test

Test all

exposed metal

surfaces

2-Wire Cord

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

0.5mA) Leakage

Currant Tester

Earth Ground

Fig. 1-1 AC Leakage Test

7. Antenna Cold Check : With the unit’s 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.

5. With the unit completely reassembled, plug the AC line cord directly the power outlet. With the unit’s 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.

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 (“solid state”) 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.)

Samsung Electronics 1-1

Precautions

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 manufacturer’s 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.

18. Picture Tube Implosion Warning : The picture tube in this receiver employs “integral implosion” 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 “in-line” picture tubes are equipped with a permanently attached deflection yoke; do not try to remove such “permanently attached” 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.

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 instrument’s ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrument’s 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.

1-2 Samsung Electronics

2. Reference Information

2-1 Servicing Jigs and Special Tools

2-1-1 Servicing guide

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

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

3. To emulate the function of the sensors, insert diode (1N4148) at service option (D710) on the function PCB.

2-1-2 Servicing Jig

Jig Item

Part No.

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

1) When repairing or confirming the operation of the deck ass’y.

2) When replacing or repairing the components located under the deck ass’y.

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 ass’y and main PCB.

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

Use

X-5 Chassis Jig

68140-500-013

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

Samsung Electronics 2-1

Reference Information

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

1. Unplug the power cord from AC outlet.

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

Function (Component side)

Note : After completing repairs, unplug and plug the power cord in order to reset.

3. To emulate the function of the sensors, insert diode (1N4148) at service optionon (D710) on the function PCB. (see diagram below).

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

5. Solder the 3 leads of the jig cable to “CN605” on the main PCB.

6. Apply power to the function PCB.

7. Insert a test tape into the housing ass’y.

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, unplug and plug the power cord to reset.

2-2 Samsung Electronics

Reference Information

How to Connect X-5 chassis jig

CONNECTS TO THE ASS'Y MAIN SVC OPTION.

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

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

CONNECTS TO THE ASS'Y MAIN CN604.

CONNECTS TO THE  ASS'Y MAIN CN603.

CONNECTS TO THE ASS'Y MAIN CN602.

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

1 SCREW (1-3X10)

ASS'Y FULL DECK

ASS'Y MAIN

CN604

SVC OPTION

CN603

CN602

2 SCREWS (2-3X10)

Samsung Electronics 2-3

Reference Information

MEMO

2-4 Samsung Electronics

3. Product Specifications and Comparison Chart

3-1 Product Specifications

Design and specifications are subject to change without notice.

Operation Description

Format VHS PAL standard

Video recording system Video : 2 rotary heads, helical scanning system

Luminance : FM azimuth recording Color : Down converted subcarrier phase shifted

Television system CCIR Standard B/G, D/K

Color system PAL, MESECAM, NT 3.58, NT 4.43, NT PB on PAL TV

Tape width 12.65 mm (1/2 inch)

Tape speed (PAL) SP : 23.39 mm/sec, (NTSC) SP : 33..35 mm/sec

Recording/playback time 3 hours with E-240 Tape

F.F/REW time About 3 min 30 sec with E-180

Heads Video : 2 rotary heads

Audio/Control : 1 stationary head Hi-Fi : 2 rotary heads Erase : 1 full track erase head

VIDEO

Input 0.5 to 2.0 Vp-p : 75 ohm unbalanced Output 1.0 Vp-p : 75 ohm unbalanced Signal-to-noise ratio Better than 43 dB Horizontal resolution More than 240 lines

Audio

Input Line : -8 dBm, 50 Kohm unbalanced Output Line : -8 dBm, 1 Kohm unbalanced Signal-to-noise ratio Hi-Fi : More than 68 dB min (IHF A filter)

Normal : More than 42 dB min (IHF A filter)

Frequency response Hi-Fi : 20Hz - 20KHz

Normal : 100Hz - 8KHz

Output channel Channel 22 - 69 (preset ch36)

Power requirement AC 100 - 240V 50/60 Hz

Power consumption Approx. 17 watts

Operation temperature 41°F-104°F (5°C-40°C)

Operation humidity 10%-75%

Weight (net) 4.0 Kg

Dimensions (W x H x D) 380 x 90.5 x 322 mm

Samsung Electronics 3-1

Product Specifications

3-2 Comparison Chart

FUNCTION

MODEL

SV-A17GV X SVK-A17GV O SV-8A X SV-9AK O SV-66H X SV-66HK O SVR-77H X

KARAOKE

3-2 Samsung Electronics

4. Disassembly and Reassembly

4-1 Cabinet and PCB

Disassemble in the order shown. Reassemble in reverse order.

4-1-1 Top cabinet removal

4-1-3 Front panel removal

(Top view)

(Bottom view)

4-1-4 Function-Timer PCB removal

4-1-2 Bottom cover removal

Note : Take extreme care not to damage the PCB

when removing it.

Samsung Electronics 4-1

Disassembly and Reassembly

4-1-5 Chassis Removal

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.

4-2 Samsung Electronics

4-2 Circuit Board Locations

Disassembly and Reassembly

Samsung Electronics 4-3

Disassembly and Reassembly

MEMO

4-4 Samsung Electronics

5. Alignment and Adjustment

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

control ass’y can be used to adjust the “X-point (tracking center) adjustment” and “Head S/W point” adjustment.

5-1 Reference

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

1. Remote control ass’y (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 ass’y 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.

NORMAL REMOTE CONTROL ASS'Y

POWER BUTTON TRACKING 

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

SPEED BUTTON

(CAN ADJUST)

POWER

4 56

789

CLK/COUNT

SPEED AFT

INDEX A.TRK

REW

PLAY

STOP

CLR/RST

FINE PROG

F.F

EJECT

SYSTEM

AUDIO

DISPLAY

INPUT

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

INPUT BUTTON TRK

(TRACKING, FINE) BUTTON PLAY BUTTON

POWER

EJECT

POWER BUTTON

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

SP/LP BUTTON

4 56

DAILY WEEKLY

789

CLK/COUNT

CLR/RST DISPLAY

PRESET BAND

SEARCH MEMORY

PLAY

REW

STOP

REC

INDEX SLOW INPUT

SP LP A.DUB VPS

OUTPUT

FINE CH

F.F

HEAD S/W ADJ.

Q-PRO

("INPUT" OR "TEST"

AND "3" BUTTON)

PLAY BUTTON

P/S

INPUT BUTTON

TEST BUTTON IS 

633-252

HIDDEN BEHIND

TRK (TRACKING, FINE) BUTTON

OF INLAY. 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)

MULTI REMOTE CONTROL ASS'Y

(CAN NOT ADJUST)

PLAY

STOP

CLR/RST

-/--

VOLUME PROG

F.F

POWER

DISP./

VCR

INPUT

GOLD COLOR

VCR

POWER

4 56

789

CLK/COUNT

SPEED

FINE

INDEX

REW

REC

SOFTEN OK SHARPEN

SLOW

PICTURE

Q-PRO

TV/VCR

A.DUB

P/S

TEST BUTTON IS 

REC

SOFTEN OK SHARPEN

SLOW

PICTURE

P/S

Q-PRO

TV/VCR

A.DUB

AUDIO

ADD BUTTON(AUDIO)

HIDDEN BEHIND OF INLAY.

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

Samsung Electronics 5-1

Alignment and Adjustment

5-2 Mechanical Adjustment

Note : Refer to the Mechanical Manual “DX7-R/DX7-RC/DX8-R/DX8-RC (AC68-20316A)” for the adjustment

and confirmation of ass’y full deck.

5-2-1 The number and position of test point

Test point : TP02 (CTL Pulse)

TP03 (H’D S/W -Trigger) TP04 (V. Envelope) TP05 (Audio out)

AUDIO OUT

H’D S/W -TRIGGER

A.OUT

V.OUT

TP05

TP06

V.ENV

H'D SW

TP04

TP03

CTL

TP02

GND

TP01

CTL PULSE

V. ENVELOPE

Fig. 5-3 The position of test point (Main PCB-Component side)

5-2 Samsung Electronics

Alignment and Adjustment

5-2-2 X-Point(Tracking center) adjustment

(See the 2-2-1 (d) AC HEAD POSITION(X-POINT) ADJUSTMENT on page 2-3 of the mechanical manual)

5-2-2 (a) IF THE REMOTE CONTROL ASS’Y IS

NOT AVAILABLE

1. Playback the colorbar alignment tape.

2. Connect CH-1 scope probe to “TP02” and CH-2 scope probe to “TP03”. And then, trigger head switching pulse.

3. Set tracking preset to 11msec (2head : 2.7msec, 4, 6head : 11msec) using the “FINE(Tracking, TRK)” button / of the other remote control ass’y except the remote control ass’y jig for X-5/ X-6 chassis and the normal remote control ass’y for X-7/X-8 chassis.

4. Connect CH-1 scope probe to “TP02” and the CH-2 to “TP03” trigger on CH-1.

5. Insert the adjusting driver (+) into X-position adjusting gear. Adjust the driver in either direction for maximum envelope waveform.

Note :

not adjust by force when adjusting the X-point using the adjusting driver (+). After turn the X-point adjusting screw (D) counterclockwise a little, perform the adjustment. After adjustment is completed, tighten the screw.

Since the adjusting gear unit may be damaged, do

- Volt/div. : CH-1 = 0.1V - Time/div. : 5msec CH-2 = 0.2V

CH-2 Probe

TP03

H’D S/W Pulse

CH-1 Probe

TP02

CTL Pulse

2.7msec(2 head), 11msec(4, 6 head)

Fig. 5-4 Tracking preset adjustment

REMOTE

BUTTONS

PUSH

CONTROL PULSE REMOVE

SCREW(B) AZIMUTH ADJUST

SCREW(A) HEIGHT ADJUST

SCREW(C) TILT ADJUST

X-POSITION ADJUST GEAR

HOLE

SCREW(D) X-POINT LOCKING

Fig. 5-6 Location of A/C Head adjustment screw

5-2-2 (b) IF THE REMOTE CONTROL ASS’Y

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

Note : How to use the “TEST” button.

1. Disattach the inlay of remote control ass’y. (See Fig. 5-1, 5-2 and 5-3)

2. Press the “TEST” button with the pincers and the precise driver as shown in Fig. 5-1, 5-2 and 5-3)

1. When using the “INPUT” button of remote control ass’y;

1) Simultaneously press the “INPUT” button and “1” button in PB mode. This will adjust the tracking center automatically.

2) Set the tracking preset using the “FINE(Tracking, TRK)” button of remote control.

3) After adjustment is completed, press the “POWER” button to release.

2. When using the “TEST” button of remote control ass’y ;

1) Simultaneously press the “TEST” button and “5”

button in PB mode.

This will adjust the tracking center automatically.

2) Set the tracking preset using the “FINE (Tracking, TRK) button of remote control.

3) After adjustment is completed, press the “POWER” button to release.

TRACKING

PUSH

Fig. 5-5 Tracking preset adjustment

Samsung Electronics 5-3

Alignment and Adjustment

5-2-2 (b) IF THE NORMAL REMOTE CONTROL

ASS’Y OF X-7/X-8(DX7-R/DX7-RC/ DX8-R/DX8-RC) CHASSIS (“IS” CHASSIS AND “C” CHASSIS) IS AVAILABLE

Note 1 : Three kinds of remote control ass’y are used

for X-7/X-8(DX7-R/DX7-RC/DX8-R/ DX8-RC) chassis.

1. Three kinds of remote control ass’y are remote control ass’y of “C” chassis, normal remote control ass’y of “IS” chassis, and multi remote control ass’y of “IS” chassis.

2. All adjustments are adjusted by remote control ass’y of “C” chassis and normal remote control ass’y of “IS” chassis.

3. For the identification of remote control ass’y by chassis, See page 5-1 and page 5-2.

Note 2 : How to use the “TEST” button.

1. Disattach the inlay of remote control ass’y.

(See Fig. 5-1, 5-2 and 5-3)

2. Press the “TEST” button with the pincers and the

precise driver as shown in Fig. 5-1, 5-2 and 5-3)

1. When using the “INPUT” button of remote

control ass’y;

1) Simultaneously press the “INPUT” button and “1”

button in PB mode. This will adjust the tracking center automatically.

2) Set the tracking preset using the “FINE(Tracking,

TRK)” button of remote control.

3) After adjustment is completed, press the

“POWER” button to release.

2. When using the “TEST” button of remote

control ass’y ;

1) Simultaneously press the “TEST” button and “5”

button in PB mode.

This will adjust the tracking center automatically.

2) Set the tracking preset using the “FINE (Tracking,

TRK) button of remote control.

3) After adjustment is completed, press the

“POWER” button to release.

5-4 Samsung Electronics

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