SAMSUNG SVA35G Service Manual

VIDEO CASSETTE RECORDER

SV-A35G/SV-C30G
SV-A13G

SERVICE

1. Precautions

2. Reference Information

3. Product Specifications

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

Manual

VIDEO CASSETTE RECORDER CONTENTS

PAL

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

POWER EJECT

PLAY

REW

F.F

REC

PROGRAM

STOP

© Samsung Electronics Co., Ltd. JULY. 1997 AC68-20373A

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-A35G

Function-Timer (Component side)

SV-A13G

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 (HD6433976R)

Reference Information

Samsung Electronics 2-5

2-2-2 IC301 (SS11501M/SS11511M)

Reference Information

2-6 Samsung Electronics

2-2-3 IC302 (LA7411)

Reference Information

Samsung Electronics 2-7

2-2-4 IC303 (SS23478MSS23377M)

Reference Information

2-8 Samsung Electronics

MEMO

Samsung Electronics 3-1

3. Product Specifications and Comparison Chart

3-1 Product Specifications

Design and specifications are subject to change without notice.

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, Interband/Hyperband
Television system STANDARD D/K, 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 5 min 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 20Hz-20KHz

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 3.2 Kg (net)
Dimensions (W x H x D) 360 x 93.5 x 290.5 mm

Product Specifications

3-2 Samsung Electronics

3-2 Comparison Chart

SV-A35G/SMR PAL/MESE/NTPB/NT3.58/4.43

X

VS/PLL RF

O

REMOCON 230V CP-2

SV-A35G/TSE PAL/MESE/NTPB/NT3.58/4.43

X

VS/PLL RF

O

REMOCON 230V EP-2

SV-A35G/HACO PAL/MESE/NTPB/NT3.58/4.43

X

VS/PLL RF

O

REMOCON FREE VOLT CP-2

SV-A35G/CIS PAL/MESE/NTPB/NT3.58/4.43

X

VS/PLL RF

O

REMOCON FREE VOLT CP-2

SV-A13G/SMR PAL/MESE/NTPB/NT3.58/4.43

X

PLL RF

X X

FREE VOLT CP-2

SV-A13G/TSE PAL/MESE/NTPB/NT3.58/4.43

X

PLL RF

X X

FREE VOLT CP-2

SV-A13G/HACO PAL/MESE/NTPB/NT3.58/4.43

X

PLL RF

X X

FREE VOLT CP-2

SV-A13G/CIS PAL/MESE/NTPB/NT3.58/4.43

X

PLL RF

X X

FREE VOLT CP-2

FUNCTION

MODEL

SYSTEM SECAM TUNER/RF FLT SHUTTLE POWER POWER CORD

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

ΠREMOVE 3 SCREWS.

Fig. 4-1 Cabinet Top removal

Disassembly and Reassembly

4-2 Samsung Electronics

4-1-2 Bottom cover removal

Fig. 4-2 Bottom Cover removal

´ REMOVE 2 SCREWS.

"A"

´ LIFT UP THE BOTTOM COVER
IN THE DIRECTION OF ARROW "A".

Disassembly and Reassembly

Samsung Electronics 4-3

4-1-3 Ass’y Front Panel removal

(Bottom view)

ΠRELEASE 4 HOOKS.

´ RELEASE 3 HOOKS.

1. 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

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

Fig. 4-4 Ass’y Function-Timer removal

´ RELEASE 6 TABS.

CN61A

CN601

ΠDISCINNECT THE FPC(CN61A) FROM THE
CN601 OF MAIN PCB.

ˇ REMOVE THE FUNCTION-TIMER PCB IN THE
DIRECTION OF ARROW.

MAIN PCB

Disassembly and Reassembly

Samsung Electronics 4-5

4-1-5 Chassis removal

ΠREMOVE 2 SCREWS.
(BH;2-3X12-YELLOW)

´ REMOVE 2 SCREWS.
(BH;2-4X12-YELLOW)

ˆ REMOVE 1 SCREW.
(BH;4X10-YELLOW)

CONNECTOR BOARD-ASS'Y

Ø LIFT THE ASS'Y MAIN UP TO REMOVE.

¨ REMOVE 1 SCREW.

(BH;1-3X12-YELLOW)

ˇ LIFT THE ASS'Y FULL DECK UP.

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 FUNCTION-TIMER

ASS'Y MAIN

Fig. 4-6 Circuit Board Locations

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. Normal remote control assÕy for X-7/X-8 (DX7-R/DX7-RC/DX8-RC) CHASSIS. (SEE FIG 5-1)

5-1-2 How to identify between normal remote control ass’y

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

2. The positions of some buttons are different.

POWER

EJECT

12 3

45 6

78 9

0

PLAY

REW

F.F

STOP

MENU Q-PRO

SPEED AFT

INDEX A.TRK

FINE PROG

DISPLAY

INPUT

S

H

U

T

T

L

E

REC

CLK/COUNT

CLR/RST

P/S

SYSTEM

PICTURE

SOFTEN OK SHARPEN

AUDIO

SLOW

NORMAL REMOTE CONTROL ASS'Y

(CAN ADJUST)

INPUT BUTTON

TRK
(TRACKING, FINE)
BUTTON

POWER BUTTON

PLAY BUTTON

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

SPEED BUTTON

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

Fig. 5-1 Remote Control Ass’y Jig for X-7/X-8 Chassis

Alignment and Adjustment

5-2 Samsung Electronics

5-2 Mechanical Adjustment

Note : Refer to the Mechanical Manual ÒDX7-R/DX7-RC/DX8-R/DX8-RC (AC68-20316A)Ó for the adjustment

and confirmation of assÕy full deck.

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

GND

CTL

TP01

H'D SW

V.ENV

A.OUT

V.OUT

TP02

TP03

TP04

TP05

TP06

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

Test point : TP02 (CTL Pulse)

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

CTL PULSE

V. ENVELOPE

AUDIO OUT

H’D S/W -TRIGGER