SAMSUNG SV4000W Service Manual

VIDEO CASSETTE RECORDER

SV-4000W

SERVICE

Manual

VIDEO CASSETTE RECORDER CONTENTS

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

4. Disassembly and Reassembly

5. Troubleshooting

6. Alignment and Adjustment

7. Exploded View and Parts List

8. Electrical Parts List

9. Block Diagrams

10. PCB Diagrams

11. Wiring Diagram

12. 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, connect a jumper or solder land (two point) at service option(W750) on the timer PCB. Be sure not to operate function key within 6 seconds.

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

E/Cable 1 E/Cable 2

X-5 Chassis Jig E/Cable 1 E/Cable 2

68140-500-013 68140-300-105 68140-500-104

Connects the deck ass’y to the main PCB connecting cable. Use for ASS’Y SMPS (CN01) ↔ ASS’Y MAIN (CN101) connecting cable. Use for ASS’Y TIMER (CN703, CN704)↔ASS’Y JOINT (CN8J01, CN8J02)

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-Timer (Conductor side)

3. To emulate the function of the sensors, place a jumper or solder land (two point) at service option(W750) on the timer PCB. Be sure not to operate function key within 6 seconds. (see diagram below).

Note : After completing repairs, turn power off 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 “CN608” 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

9. If the test tape is ejected while the jig is in use,

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.

attempt to re-load the tape by simultaneously touching the start and end sensor LEDs. If the tape still does not load, turn power off in order to reset.

2-2 Samsung Electronics

Reference Information

How to Connect X-5 chassis jig

CONNECTS TO THE ASS'Y MAIN CN608.

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

CN608

CN603

CN602

2 SCREWS (2-3X10)

Samsung Electronics 2-3

Reference Information

How to Connect E/Cable 1

E/CABLE 1

ASS’Y SMPS

ASS’Y MAIN CN101

CN1

How to Connect E/Cable 2

ASS’Y TIMER

ASS’Y JOINT

E/CABLE 2

CN8J01

CN8J02

CN703

CN704

2-4 Samsung Electronics

3. Product Specifications

Design and specifications are subject to change without notice.

Operation Description

Recording system Rotary head azimuth recording, luminance signal FM recording system

Crominance signal down converted phase shift recording system (NTSC, PAL, PAL-M) Chrominance signal down converted direct recording system (MESECAM) Chrominance signal 1/4 frequency countdown direct recording system

(SECAM) Color system NTSC3.58, NTSC4.43, PAL, PAL-M, PAL-N, SECAM Tuning system B/G, D/K, I, M, N RF out Splitter type (without RF converter) Tape recording/playback NTSC, PAL, PAL-M, SECAM, MESECAM Tape speed NTSC 33.35mm/sec (standard recording)

PAL-M 16.375mm/sec (when playing the double speed recording tape)

11.12mm/sec (three times recording) PAL 23.39mm/sec (standard recording) MESECAM 11.69mm/sec (double speed recording) SECAM

Tape format VHS tyep video tape, S-VHS type video type (playback only) Recording time Maximum 8 hours (with a T-160 tape) Rewinding time within 3 minutes (High speed rewinding, T-120 or E-180 tpae) Video input 1.0Vp-p (Unbalanced) 75 Ω Video output 1.0Vp-p (Unbalanced) 75 Ω Video S/N Above 43dB (standard recording) Resolution Above 220 (standard recording NTSC), 240 (standard recording PAL) Audio input -8dBm Audio output -6dBm (Hi-Fi), -7dBm (Mono) Audio S/N Above 39dB (Mono), 68dB (Hi-Fi) Audio frequency 20Hz-20KHz (Hi-Fi standard recording) characteristics 100Hz-10KHz (standard recording NTSC)

100Hz-8KHz (standard recording PAL), 100Hz-8KHz (SLP, LP)

Rated voltage 100V~240V AC Rated frequency 50/60Hz Power consumption ARP. 26watts on recording; 8 watts off Working ambient temperature 41°F-104°F (5°C-40°C) Installation conditions Operation position : Horizontal, Relative humidity : Below 80% Outside dimensions Width 17.8 inches X Length 13.0 inches X Height 3.4 inches Weight 13.2 lbs

Samsung Electronics 3-1

Product Specifications

MEMO

3-2 Samsung Electronics

4. Disassembly and Reassembly

4-1 Cabinet Assembly

Note : Disassemble in the order shown.

Reassemble in reverse order.

4-1-1 Panel-Side L/R and Cabinet Top removal

ˇ RELEASE 2 HOOKS.

¨ REMOVE THE PANEL-SIDE(L) IN THE DIRECTION OF ARROW "A".

´ REMOVE 2 SCREWS.

(BH;5-4X16-BLOCK)

"A"

"C"

” LIFT UP THE CABINET-TOP  IN THE DIRECTION OF ARROW "C".

Ø RELEASE 2 HOOKS.

Œ REMOVE 1 SCREW.

(BH;5-4X16-BLOCK)

"B"

ˆ REMOVE 2 SCREWS. (BH;5-4X16-BLOCK)

∏ REMOVE THE PANEL-SIDE(R) IN THE DIRECTION OF ARROW "B".

Fig. 4-1 Cabinet Top removal

Samsung Electronics 4-1

Disassembly and Reassembly

4-1-2 Bottom cover removal

ˇ RELEASE 2 TABS.

"A"

Œ REMOVE 3 SCREWS. (BH;3-3X12-YELLOW)

ˆ LIFT UP THE COVER-BOTTOM IN THE DIRECTION OF ARROW "B".

"B"

"A"

´ REMOVE THE DECORATION-LEG IN THE DIRECTION OF ARROW "A".

¨ RELEASE 2 TABS.

Fig. 4-2 Bottom Cover removal

4-2 Samsung 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 Electronics 4-3

Disassembly and Reassembly

4-1-4 Ass’y Function removal

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

Œ DISCONNECT CN4303 FROM THE ASS'Y I/O.

"A"

´ RELEASE 6 HOOKS.

ˇ REMOVE THE ASS'Y FUNCTION IN THE DIRECTION

OF ARROW "A".

Fig. 4-4 Ass’y Function-Timer removal

4-4 Samsung Electronics

4-1-5 Ass’y Full Deck removal

Disassembly and Reassembly

´ REMOVE 2 SCREWS.

ˇ REMOVE 2 SCREWS.

¨ LIFT UP THE ASS'Y FULL DECK

IN THE DIRECTION OF ARROW "B".

"B"

"A"

Œ REMOVE THE CONNECTOR-WAFER IN THE DIRECTION OF ARROW "A".

Fig. 4-5 Ass’y Full Deck removal

Samsung Electronics 4-5

Disassembly and Reassembly

4-1-6 Ass’y SMPS removal

Œ REMOVE 3 SCREWS.

´ REMOVE THE ASS'Y SMPS

IN THE DIRECTION OF ARROW.

4-1-7 Ass’y Digital removal

Œ REMOVE HOLDER PCB.

Fig. 4-6 Ass’y SMPS removal

´ DISCONNECT CNA2 FROM ASS'Y I/O.

ˇ DISCONNECT CNA1 FROM ASS'Y IF.

¨ LIFT UP THE ASS'Y DIGITAL IN THE DIRECTION OF ARROW.

Fig. 4-7 Ass’y Digital removal

4-6 Samsung Electronics

4-1-8 Ass’y IF removal

´ RELEASE 4 TABS.

Disassembly and Reassembly

Œ REMOVE 2 SCREWS.

ˇ LIFT UP THE ASS'Y IF IN THE DIRECTION OF ARROW.

Fig. 4-8 Ass’y IF removal

Samsung Electronics 4-7

Disassembly and Reassembly

4-1-9 Ass’y Main removal

Œ REMOVE 1 SCREW.

ˇ LIFT UP THE ASS'Y MAIN IN THE DIRECTION 

OF ARROW.

´ RELEASE 3 TABS.

Fig. 4-9 Ass’y Main removal

4-8 Samsung Electronics

4-2 Circuit Board Locations

ASS'Y I/O

Disassembly and Reassembly

ASS'Y SMPS

ASS'Y MAIN

ASS'Y IF

ASS'Y DIGITAL

ASS'Y FUNCTION

Fig. 4-10 Circuit Board Locations

Samsung Electronics 4-9

Disassembly and Reassembly

MEMO

4-10 Samsung Electronics

6. 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.

6-1 Reference

6-1-1 The type of remote control ass’y

The remote control ass’y of SV-4000W unit.

"VCR POWER"  BUTTON (RESET)

"SPEED" BUTTON (H'D S/W ADJ.)

"FINE" BUTTON (TRK MAX./MIN.)

VCR POWER

INDEX REC.SPEED CLK/COUNT PICTURE Q-PRO

CLR/RST

EJECT

STROBE AUDIO

ART INPUT

REC

DISPLAY MONITOR A.DUB

INPUT SYSTEM

A.TRK

FINE

STOP

REV

P/STILL

OUTPUT SYSTEM

SLOW

FWD

(TRACKING CENTER ADJ.)

"5" BUTTON

Fig. 6-1 Remote control ass’y of SV-4000W unit

Samsung Electronics 6-1

Alignment and Adjustment

6-2 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.

6-2-1 The number and position of test point

Test point : TP02 (CTL Pulse)

TP01 (H’D S/W -Trigger) TP03 (V. Envelope)

Fig. 6-2 The position of test point (Main PCB-Component side)

6-2 Samsung Electronics

Alignment and Adjustment

6-2-2 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)

6-2-2 (a) IF THE REMOTE CONTROL ASS’Y IS

NOT AVAILABLE

1. Playback the color bar alignment tape.

2. Connect CH-1 scope probe to “TP02” and CH-2 scope probe to “TP01”. 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 “TP01” 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.

H’D S/W Pulse

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

TP01

SCREW(B) AZIMUTH ADJUST

SCREW(A) HEIGHT ADJUST

SCREW(C) TILT ADJUST

X-POSITION ADJUST GEAR

HOLE

SCREW(D) X-POINT LOCKING

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

6-2-2 (b) IF THE REMOTE CONTROL ASS’Y

(SV-4000W UNIT) IS AVAILABLE

1. Connect a jumper or solder land (2 point) at service option (W750) on the timer PCB.

2. Press the No. 5 (Tracking center) button within 6 seconds of remote control ass’y.

3. Adjust it with FINE (Tracking max.)/ (Tracking min.) button of remote control ass’y.

4. After completing repairs, turn power off in order to reset.

CH-1 Probe

TP02

CTL Pulse

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

Fig. 6-3 Tracking preset adjustment

REMOTE

BUTTONS

PUSH

CONTROL PULSE REMOVE

TRACKING

PUSH

Fig. 6-4 Tracking preset adjustment

Samsung Electronics 6-3

Alignment and Adjustment

6-3 Electrical Adjustment

6-3-1 Servo Adjustment

1. Head S/W

Note : Only remote control ass’y can adjust.

1) Connect a jumper or solder land (2 point) at service option (W750) on the timer PCB.

2) Press the speed button within 6 seconds Head S/W adjustment is operated automatically.

3) After completing repairs, turn power off in order to reset.

6-3-2 RF Adjustment

1. AFT

1) Apply 38.9MHz (90dbu) to W415 connected TM Block (U401) pin 12 with pattern generator.

2) Connect voltmeter to the pin 15 of IC401.

3) Adjust TL401 for DC2.6 ± 0.1V.

4) Connect voltmeter to the pin 15 of IC402

5) Adjust TL402 for DC2.6 ± 0.1V.

Pattern generator

BNC Cable

2. AGC

1) Receive CH2 (48.25MHz, 70dBu:B/G) with TV CH generator at E-E mode.

2) Connect DC voltmeter to W424

3) Adjust VR401 for DC4.3 ± 0.2V.

* Composition for RF AGC adjustment

PAL Color bar

signal out

TV CH Generator

CH 2 (48.25MHz)

VCR

ANT IN

W424

PAL Pattern

generator

Attenuator

70dBu

DC Voltmeter

GROUND

IF PCB (Component side)

6-4 Samsung Electronics

Alignment and Adjustment

6-3-3 Video Adjustment

1. NTSC Skew

1) Load the instrument with an alignment tape and playback the color bar signal(NTSC SP color bar tape).

2) Connect channel-1 scope probe (1V/div, 50µs/div.).

3) Connect channel-2 scope probe to video terminal of JC4309 (I/O PCB).

4) Set the VCR to RPS (Reverse picture search) or FPS (Forward picture search) mode.

5) Adjust VR4301 (I/O PCB) so that the 100% white and pedestal is as flat as possible.

CORRESPOND TO LEVEL

(Before Adjustment)

(After Adjustment)

ADJUST (COMPONENT SIDE)

VIDEO TERMINAL

Main PCB (Conductor Side)

Samsung Electronics 6-5

Alignment and Adjustment

6-3-4 Digital Adjustment

Note : 1. Be sure to adjust in due order.

2. The output mode selection key is on the Ass’y Front Panel.

3. See page 6-9 for the location of test points and adjustments.

1. W-Y

1) Apply PAL color bar signal to the video jack on the rear panel.

2) Select output mode selection key to “THROUGH”.

3) Connect channel-1 oscilloscope probe to TPA9.

4) Adjust VRA3 for 2.5Vp-p ± 0.1Vp-p.

2.5Vp-p ± 0.1Vp-p

3. W-(B-Y)

2. W-(B-Y)

1) Apply PAL color bar signal to the video jack on the rear panel.

2) Select output mode selection key to “THROUGH”.

3) Connect channel-1 oscilloscope probe to TPA10.

4) Adjust VRA4 for 1.8Vp-p ± 0.1Vp-p.

1.8Vp-p ± 0.1Vp-p

1) Apply PAL color bar signal to the video jack on the rear panel.

2) Select output mode selection key to “THROUGH”.

3) Connect channel-1 oscilloscope probe to TPA11.

4) Adjust VRA5 for 1.8Vp-p ± 0.1Vp-p.

1.8Vp-p ± 0.1Vp-p

6-6 Samsung Electronics

Alignment and Adjustment

4. WR-SYNC

1) Apply PAL color bar signal to the video jack on the rear panel.

2) Select output mode selection key to “THROUGH”.

3) Connect channel-1 oscilloscope probe to TPA9 (50mV, 200nsec). Connect channel-2 oscilloscope probe to TPA1 (200mV, 200nsec).

4) Adjust VRA8 for 400nsec ± 100nsec.

TPA1 TPA9

5. SYNC Suppress

1) Apply NTSC color bar signal to the video jack on the rear panel.

2) Select output mode selection key to “PAL”.

3) Connect channel-1 oscilloscope probe to TPA12.

4) Adjust VRA1 for 620mVp-p ± 40mVp-p.

620mVp-p ± 40mVp-p

400nsec ± 100nsec

6. Burst Phase

1) Apply NTSC color bar signal to the video jack on the rear panel.

2) Select output mode selection key to “PAL”.

3) Connect channel-1 oscilloscope probe to TPA12.

4) Adjust VRA2 for 5.4µsec ± 0.1µsec.

5.4µsec ± 0.1µsec

Samsung Electronics 6-7

Alignment and Adjustment

7. Clolor Balance

1) Apply NTSC color bar signal to the video jack on the rear panel.

2) Select output mode selection key to “PAL”.

3) Connect channel-1 oscilloscope probe to TPA15.

4) Adjust VRD1 so that waveforms are aligned as shown below.

CORRESPOND TO LEVEL

8. SECAM Freq.

1) Apply PAL color bar signal to the video jack on the rear panel.

2) Select output mode selection key to “SECAM”.

3) Connect channel-1 oscilloscope probe to TPA12.

4) Adjust VRA6 so that waveforms are aligned as shown below.

9. X’TAL

1) Apply PAL color bar signal to the video jack on the rear panel.

2) Connect the frequency counter to TP24.

3) Select output mode selection key to “PAL”.

4) Adjust VCD1 for 4.433619MHz ± 25Hz.

5) Select output mode selection key to “NTSC”.

6) Adjust VCD2 for 3.579545MHz ± 25Hz.

7) Select output mode selection key to “PAL-N”.

8) Adjust VCD3 for 3.582056MHz ± 25Hz.

9) Select output mode selection key to “PAL-M”.

10) Adjust VCD4 for 3.575611MHz ± 25Hz.

No. Input Output Adjust Point Specification

1 PAL Color bar PAL VCD1 4.433619MHz ± 25Hz 2 PAL Color bar NTSC VCD2 3.579545MHz ± 25Hz 3 PAL Color bar PAL-N VCD3 3.582056MHz ± 25Hz 4 PAL Color bar PLA-M VCD4 3.575611MHz ± 25Hz

CORRESPOND TO LEVEL

6-8 Samsung Electronics

♦ Test point and adjustment point

Alignment and Adjustment

7. Color Balance

4. WR-SYNC

5. SYNC Suppress

(Conductor Side)

9. X'TAL

3. W-(B-Y)

2. W-(B-Y)

1. W-Y

8. SECAM Freq.

6. Burst phase

Digital PCB (Component side)

Samsung Electronics 6-9

Alignment and Adjustment

6-4 Timing Chart of Program S/W

SW A (IC601-77)

SW B (IC601-78)

END

-SENSOR

(IC601-13) START

-SENSOR

(IC601-14)

CASS IN

Position

Eject

Cassette IN

Unload

R. PS

R. Slow

Still

Play

Stop

EJECT UNLOAD RPS R.SLW STILL PB STOP F/R

Program S/W (SW601)

E/S S/S SW A SW B

L H

H L

L H

H L

L H

Eject

Cassette IN

Unload

R. PS, Z-R. PS

Pinch Roller off Position

Still, Slow, F-ADV

PB, T-Stop, REC, Pause, F. PS, Z-FPS

Stop, Power off

Action Mode

FF/REW

6-10 Samsung Electronics

H L

FF, REW

5. Troubleshooting

S.M.P.S in operate

Yes

Check AC power cord

Yes

Check voltage  of bridge diode

BD(+)

Yes

Check switching

waveform of

IC01-1

Yes

Check voltage of

CN1-3,4,5,6,

7,8,9

Replace AC power cord

Recheck and replace BD01, FUSE, R01

Check a shortage/open of each pin and pattern

Replace D31,D32,D33,D34, D35,D36

Samsung Electronics 5-1

Yes

Check output line of D31,D32, D33,D34,D35,D36

Replace transformer

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