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 Electronics1-1
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.
1-2Samsung 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, connect a
jumper or solder land (two point) at service
option(W750) on the function-timer 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 Electronics2-1
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-Timer (Component side)
Note : After completing repairs, SW715 on the function PCB in order to reset.
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.
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).
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.
2-2Samsung Electronics
Reference Information
How to Connect X-5 chassis jig
CONNECTS TO THE ASS'Y MAIN CN605.
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 CN601.
CONNECTS TO THE CAPSTAN MOTOR
CONNECTOR OF ASS'Y FULL DECK.
1 SCREW (1-3X10)
ASS'Y FULL DECK
ASS'Y MAIN
CN604
CN605
CN603
CN601
2 SCREWS (2-3X10)
Samsung Electronics2-3
Reference Information
MEMO
2-4Samsung Electronics
3. Product Specifications and Comparison Chart
3-1 Product Specifications
Design and specifications are subject to change without notice.
OperationDescription
FormatVHS PAL standard
HeadsVideo : 4 rotary heads
Hi-Fi audio : 2 rotary heads
Audio/Control : 1 stationary head
Erase : 1 full track erase head
Flying erase : 1 rotary head
Colour systemPAL/MESECAM : Down converted subcarrier phase shifted direct recording
NTSC PB on PAL TV
Tape speedSP : 23.39 mm/sec
LP : 11.69 mm/sec
Recording/playback timeSP : 3 hours (E-180 Tape)
LP : 6 hours (E-180 Tape)
F.F/REW timeAbout 100-190 sec in REW/F.F with E-180
VIDEO
Input0.5 to 2.0 Vp-p : 75 ohm unbalanced
Output1.0 ± 0.2 Vp-p : 75 ohm unbalanced
Signal-to-noise ratioBetter than 43 dB (SP)
Horizontal resolutionMore 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 ratio68 dB min (IHF A filter)
Frequency response20Hz-20KHz
Power requirement230V (AC 50/60 Hz)
Power consumptionApprox. 21 watts
Operation temperature41°F-104°F (5°C-40°C)
Operation humidity10%-75%
Weight4.4 Kg (net)
Dimensions (W x H x D)380 x 90.5 x 310 mm
Samsung Electronics3-1
Product Specifications
3-2 Comparison Chart
AREA
SELLING
GERMANY,AUSTRIA
TV
VCR/
TYPE
REMOCON
JUST REC
SLOW/DLC
EDIT
VIDEO
SWEDEN,FILAND
NORWAY,DENMARK
OOMULTIOSPAIN
OOMULTIO
OOMULTIONEDERLAND
A2/
NICAM
ACS
VIEW
SHOW
ATS
PDC
VPS/
AUDIO
DUBBING
JOG
SHUTTLE/
A2/NICAM
A2/NICAM
A2/NICAM
FUNCTION
MODEL
SV-A160X/XEG (SV-700X)OOOOOOA2OOMULTIO
SV-A160X/XET (SV-700X)OOOOOOA2OOMULTIOITALY
SV-A160X/XEC (SV-700X)OOOOOO
SV-A160X/XEE (SV-700XOOOOOO
3-2Samsung Electronics
SV-A160X/AMF (SV-700X)OOOOOO
SV-A160X/ATR (SV-700X)OOOOOOA2OOMULTIOSWISS
4. Disassembly and Reassembly
4-1 Cabinet Assembly
Note : Disassemble in the order shown.
Reassemble in reverse order.
4-1-1 Cabinet Top removal
Œ REMOVE 3 SCREWS.
(BH:3-4X16-BLACK)
Fig. 4-1 Cabinet Top removal
Samsung Electronics4-1
Disassembly and Reassembly
4-1-2 Bottom cover removal
Œ REMOVE 2 SCREWS.
(BH:2-3X12-YELLOW)
"A"
´ LIFT UP THE BOTTOM COVER
IN THE DIRECTION OF ARROW "A".
Fig. 4-2 Bottom Cover removal
4-2Samsung Electronics
4-1-3 Ass’y Front Panel removal
Disassembly and Reassembly
Œ RELEASE 4 HOOKS.
(Top view)
´ RELEASE 3 HOOKS.
(Bottom view)
Fig. 4-3 Ass’y Front Panel removal
Samsung Electronics4-3
Disassembly and Reassembly
4-1-4 Ass’y Function-Timer removal
Note : Take extreme care not to damage the PCB when removing it.
´ REMOVE THE FUNCTION-TIMER PCB IN THE
DIRECTION OF ARROW.
Œ RELEASE 5 TABS.
Fig. 4-4 Ass’y Function-Timer removal
4-4Samsung Electronics
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.
Disassembly and Reassembly
´ REMOVE 2 SCREWS.
(BH;2-3X12-YELLOW)
ˇ REMOVE 2 SCREWS.
(BH;2-4X12-YELLOW)
¨ LIFT THE ASS'Y FULL DECK UP.
CONNECTOR BOARD-ASS'Y
” LIFT THE ASS'Y MAIN
UP TO REMOVE.
Ø RELEASE 1 TAB
"A"
∏ RELEASE 2 TABS.
ˆ REMOVE 1 SCREW.
(BH;3X12-YELLOW)
Œ REMOVE THE CONNECTOR-WAFER IN THE DIRECTION OF ARROW "A".
Fig. 4-5 Chassis Removal
Samsung Electronics4-5
Disassembly and Reassembly
4-2 Circuit Board Locations
ASS'Y MAIN
ASS'Y FUNCTION-TIMER
ASS'Y SUB
Fig. 4-6 Circuit Board Locations
4-6Samsung 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
1
2
3
456
789
CLK/COUNT
SPEED AFT
INDEX A.TRK
0
REW
H
S
PLAY
CLR/RST
T
T
U
L
STOP
FINE PROG
E
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
456
DAILY WEEKLY
789
CLK/COUNT
CLR/RST DISPLAY
0
PRESET BAND
SEARCH MEMORY
H
S
U
T
F
I
H
S
PLAY
REW
STOP
REC
INDEX SLOW INPUT
SP LP A.DUB VPS
OUTPUT
3
FINE CH
T
T
L
E
F.F
HEAD S/W ADJ.
Q-PRO
("INPUT" OR "TEST"
MENU
AND "3" BUTTON)
PLAY BUTTON
P/S
INPUT BUTTON
TEST BUTTON IS
633-252
HIDDEN BEHIND
TRK
(TRACKING, FINE)
BUTTON
1
2
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)
T
U
H
S
PLAY
STOP
3
CLR/RST
-/--
VOLUME PROG
T
L
E
F.F
POWER
DISP./
TV
VCR
TV
INPUT
GOLD COLOR
GOLD COLOR
GOLD COLOR
GOLD COLOR
VCR
POWER
1
2
456
789
CLK/COUNT
0
SPEED
FINE
INDEX
REW
REC
MENU
SOFTEN OK SHARPEN
SLOW
PICTURE
Q-PRO
TV/VCR
A.DUB
P/S
TEST BUTTON IS
REC
MENU
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 Electronics5-1
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
Fig. 5-3 The position of test point (Main PCB-Component side)
5-2Samsung 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.