Samsung SV-G180UM User manual

VIDEO CASSETTE RECORDER
Chassis : Scorpio
SV-G180UM/G175UM/G170UM/G95UMA
SV-G75UM/G70UM/G45UMA
SV-G100UP/G70P/G55UP/G50UP
SV-G180P/G175P/G171P/G75P/G71P
SV-G45UPA/G45UPV/G45PA/G45PV
SERVICE
1. Precautions
2. Alignment and Adjustment
3. Exploded View and Parts List
4. Electrical Parts List
5. Schematic Diagrams
Manual
VIDEO CASSETTE RECORDER CONTENTS
For mechanical disassembly and adjustment, refer to the “Mechanical Manual” (TS-10 AC68-01405A).
VIDEO L AUDIO R
LINE IN
POWER EJECT
TV/VCR MENU
CHANNEL
TRACKING
REC
INPUT
TAPESPEED
PLAY P/S STOP
J
O
G
/
S
H
U
T
T
L
E
SV-G180UM/G180P
SV-G175UM/G75UM/G175P/G75P
SV-G170UM/G70UM/G70P
SV-G171P/G71P
SV-G95UMA/G45UMA/G45UPA/G45UPV/G45PA/G45PV
SV-G100UP/G50UP
SV-G55UP
POWER EJECT
POWER REC
REW
PLAY
F.F STOP
EJECT
POWER
CHANNEL REC STOP
MENU
REW PLAY F.F
LINE IN 2
VIDEO L AUDIO R
EJECT POWER
CHANNEL
MENU
REC STOP
PLAY
REW
FF
EJECT POWER
CHANNEL REC STOP
MENU
PLAY
REW F.F
MENU
SERVICE MANUAL SV-G180UM/G75UM/G100UP/G70P/G180P/G175P/G75P/G71P/G95UMA/G45UPA/G45PA
ELECTRONICS
© Samsung Electronics Co., Ltd. APR. 2001
Printed in Korea
AC68-01493A

IMPORTANT SERVICE GUIDE
♦MODE SWITCH (PROGRAM SWITCH) ASSEMBLY POINT
1) When installing the ass’y deck on the Main PCB, be sure to align the assembly point of mode switch.
ASSEMBLY POINT
(ALIGN TWO ARROWS)
Fig. 1
♦HOW TO EJECT THE CASSETTE TAPE
(If the unit does not operate on condition that tape is inserted into housing ass’y)
1) Turn the Gear Worm Œclockwise in the direction of arrow with screw driver. (See Fig. 2)
(Other method ; Remove the screw of Motor Load Ass’y, Separate the Motor Load Ass’y)
2) When Slider S, T are approached in the position of unloading, rotate holder Clutch counterclockwise after inserting screw driver in the
hole of frame’s bottom in order to wind the unwiunded tape. (Refer to Fig. 3)
(If you rotate Gear Worm Œcontinuously when tape is in state of unwinding, you may cause a tape contamination by grease and
tape damage. Be sure to wind the unwiunded tape in the state of set horizontally.)
3) Rotate Gear Worm Œclockwise using screw driver again up to the state of eject mode and then pick out the tape. (Refer to Fig. 2)
Fig. 2 Fig. 3
ŒGEAR WORM
FRAME

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 protective 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. 1-1) :
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 unit’s
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.
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 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.
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 any 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
CURRENT
TESTER
EARTH
GROUND
TEST ALL
EXPOSED METER
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 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.
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, 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.
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.

Samsung Electronics 2-1
2. Alignment and Adjustment
2-1 Reference
1) X-Point (Tracking center) adjustment, “Head switching adjustment” and “NVRAM option setting” can be adjusted with remote control.
2) When replacing the Micom (IC601) and NVRAM (IC603 ; EEPROM) be sure to adjust the “Head switching adjustment” and
“NVRAM option setting”.
3) When replacing the cylinder ass’y, be sure to adjust the “X-Point” and “Head switching adjustment”.
4) Among Samsung VCR remote control used for adjustment as a accessory, only the remote control that has figures buttons (0 ~ 9) is
available for all adjustment regardless of chassis.
5) How to adjustment.
- Momently short-circuit the test point on Main PCB with pincers to set the adjustment mode.
- If the corresponding adjustment button is pressed, the adjustment is performed automatically.
- If the adjustment is completed, be sure to turn the power off.
2-1-1 Location of adjustment button of remote control
Fig. 2-1
SHUTTLE
V-LOCK
REPLAY F.ADV/SKIP
TV/VCR PREV.CH
R
E
C
R
E
C
.
S
P
E
E
D
L
I
N
E
I
N
A
U
D
I
O
S
E
A
R
C
H
/
E
X
I
T
C
L
E
A
R
D
I
S
P
L
A
Y
POWER EJECT
CH/TRK
VCR
TV
A.TRK
ENTER
MENU
SLOW
VOL
100
Remote Control for adjustment is not supplied as a Service Jig.
VCR POWER TV POWER
EJECT TV/VCR
SLOW
A.TRK
100
TV VCR TRACKING
SELECT
AUDIO
VOL CH
PREV.CH
DISPLAY
SEARCH/EXIT
REC P/STILL
MENU
REC.SPEED LINE IN CLEAR F.ADV
REPLAY 30S-SKIP
REV
FWD
X-Point (Tracking Center)
Adjustment
Head Switching Adjustment
NVRAM Option Setting

2-2
Alignment and Adjustment
Samsung Electronics
2-1-2 Test point location for adjustment mode setting
Fig. 2-2 Main PCB (Top View)
Short-Circuit for a second and release.
Application Models ; SV-G180UM/G175UM/G170UM/G75UM/G70UM/G100UP/G70P/G50UP/G180P/G175P/G171P/G75P/G71P

Alignment and Adjustment
2-3
Samsung Electronics
Fig. 2-3 Main PCB (Top View)
Short-Circuit for a second and release.
Application Models ; SV-G95UMA/G45UMA/G55UP/G45UPA/G45UPV/G45PA/G45PV

2-4
Alignment and Adjustment
Samsung Electronics
2-2 Mechanical Adjustment
Note : Refer to the Mechanical Manual “TS-10 (AC68-01405A)” for the adjustment and confirmation of ass’y deck.
2-2-1 The number and position of test point
Test point : TP601 (Control Pulse)
TP602 (H’D S/W -Trigger)
TP301 (Envelope)
TP302 (Audio output)
TP303 (Video output)
Fig. 2-4 Location of Test point (Main PCB-Top View)
AUDIO OUTPUT
HEAD SWITCHING
ENVELOPE
2-2-2 ACE Head Position (X-Point) Adjustment
(See the 2-2-1(d) ACE Head Position (X-Point) Adjustment
on page 2-2 of the Mechanical Manual)
1) Playback the alignment tape (Color bar).
2) Momently short-circuit the test point on Main
PCB with pincers to set the adjustment mode.
(See Fig. 2-2 and 2-3)
3) Press the “5” button of remote control then adjust-
ment is operated automatically. (See Fig. 2-1)
4) Connect the CH-1 probe to TP301 (Envelope) the
CH-2 probe to TP602 (H’D switching pulse) and
then trigger to CH-1.
5) Insert the (-) driver into the X-Point adjustment
hole and adjust it so that envelope waveform is
maximum.
6) Turn the Power off.

Alignment and Adjustment
2-5
Samsung Electronics
2-3 Head Switching Point Adjustment
1) Playback the alignment tape.
2) Momently short-circuit the test point on Main PCB with pincers to set the adjustment mode.
(See Fig. 2-2 and 2-3)
3) Press the “REC.SPEED” button of remote control then adjustment is operated automatically. (See Fig. 2-1)
4) Turn the Power off.
2-4 NVRAM Option Setting
1) Momently short-circuit the test point on Main PCB with pincers to set the adjustment mode.
(See Fig. 2-2 and 2-3)
2) Press the “MENU” button on the remote control about 5 seconds then option setting display is appeared.
(See Fig. 2-5)
3) Select the option number (See Table 2-1) of corresponding model with “FF” and “REW” button on the
remote control.
4) If selecting the option number is completed, press the “STOP” button of remote control.
(If “STOP” button is pressed, the selected number is changes reversed color. ; See Fig. 2-5)
5) Press the “MENU” button of remote control again to store the option number.
(“COMPLETE” is displayed for a second as shown Fig. 2-6 and the setting is completed.)
6) Turn the Power off.
1) NVRAM Option is adjusted at production line basically.
2) In case Micom (IC601) and NVRAM (IC603 ; EEPROM) is replaced, be sure to set the corresponding option number of the repaired
model. (If the option is not set, the unit is not operated.)
MOVE : SAVE : MENU
01 02 03 04 05 06 07 08
09 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24
25 26 27 28 29 30 31 32
33 34 35 36 37 38 39 40
Fig. 2-5
MOVE : COMPLETE
01 02 03 04 05 06 07 08
09 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24
25 26 27 28 29 30 31 32
33 34 35 36 37 38 39 40
Fig. 2-6
<Table 2-1>
COUNTRY MODELS OPTION NUMBER
MEXICO SV-G180UM 2, 4, 5, 6, 7, 10, 13, 14, 15, 17, 24, 28, 31, 32, 37
SV-G175UM 2, 4, 5, 6, 7, 10, 15, 17, 18, 25, 28, 31, 37
SV-G170UM 2, 4, 5, 6, 7, 10, 15, 17, 18, 25, 28 ,31 ,37
SV-G95UMA 2, 4, 6, 7, 10, 12, 15, 17, 18, 28, 30, 31, 37
SV-G75UM 4, 5, 6, 7, 15, 17, 18, 25, 28, 37
SV-G70UM 4, 5, 6, 7, 15, 17, 18, 25, 28, 37
SV-G45UMA 4, 6, 7, 12, 15, 17, 18, 28, 30, 37
PANAMA SV-G100UP 2, 4, 6, 7, 10, 15, 17, 18, 25, 28, 31, 37
SV-G70P 4, 5, 6, 7, 15, 17, 18, 25, 28, 37
SV-G55UP 4, 6, 7, 12, 15, 17, 18, 28, 30, 37
SV-G45UPA 4, 6, 7, 15, 17, 18, 25, 28, 37
SV-G45UPV 4, 6, 7, 12, 15, 17, 18, 28, 30, 37
CHILLE SV-G180P 2, 4, 5, 6, 7, 10, 13, 14, 15, 17, 24, 28, 31, 32, 37
SV-G171P 2, 4, 5, 6, 7, 10, 15, 17, 18, 25, 28, 31, 37
SV-G71P 4, 5, 6, 7, 15, 17, 18, 25, 28, 37
SV-G45PA 4, 6, 7, 12, 15, 17, 18, 28, 30, 37
SV-G45PV 4, 6, 7, 12, 15, 17, 18, 28, 30, 37
PERU SV-G180P 2, 4, 5, 6, 7, 10, 13, 14, 15, 17, 24, 28, 31, 32, 37
SV-G175P 2, 4, 6, 7, 10, 15, 17, 18, 25, 28, 31, 37
SV-G75P 4, 6, 7, 15, 17, 18, 25, 28, 37

2-6
Alignment and Adjustment
Samsung Electronics
MEMO