Samsung Svr-433, Svr-2301, SVR-230B, Svr-230w, Svr-233 Service Manual

...

VIDEO CASSETTE RECORDER

SVR-433 SVR-233 SVR-230B SVR-230W SVR-2301 SVR-131

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” (DX-9R AC68-00001A).

SERVICE MANUAL

SVR-433/233/230B/230W/2301/131

ELECTRONICS

Printed in Korea

AC68-00906A

SVR-433/233

SVR-230B/230W

SVR-2301

SVR-131

REC STOP PLAY

PROG

EJECT

STANDBY/ON

LINE IN 2

REW

F.F

VIDEO AUDIO

EJECT

STANDBY/ON

REW F.F

PLAY

PROG

REC STOP

EJECT

PROG

REC STOP

REW F.F

PLAY

STANDBY/ON

EJECT

STANDBY/ON

REC STOP

PLAY

SHARPNESS

IMPORTANT SERVICE GUIDE

 MODE SWITCH (PROGRAM SWITCH) ASSEMBLY POINT

1) When installing the ass’y full deck on the Main PCB, be sure to align the assembly point of mode switch.

ASSEMBLY POINT

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) Remove the Holder Worm Œ and the gear worm ´. (See Fig. 2)

2) Turn the Gear Worm Wheel ˇ counterclockwise in the direction of arrow with screw driver. (See Fig. 2)

3) 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 unwounded tape. (Refer to Fig. 3) (If you rotate Gear Worm Wheel continuously when tape is in state of unwinding, you may cause a tape contamination by grease and tape damage. Be sure to wind the unwounded tape in the state of set horizontally.)

4) Rotate Gear Worm Wheel ˇ counterclockwise 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

Œ HOLDER WORM

´ GEAR WORM

SCREW DRIVER

ˇ GEAR WORM WHEEL

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, 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 “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. Areplacement 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 (IC605 ; 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.

- Press the “SW718 (TEST)” button on Main PCB 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

Q-PRO

IPC

DISPLAY

SHUTTLE

V-LOCK

CLR/RST F.ADV

INPUT INDEX

TRK PROG

REPEAT

Remote Control for adjustment is not supplied as a Service Jig.

STANDBY/ON DISPLAY

CNT.RESET SPEED

IIP/S IPC

TRK

REC MENU

Head Switching Adjustment

("SPEED" Button)

NVRAM Option Setting

("MENU" Button)

X-Point (Tracking Center) Adjustment

("5" Button)

STANDBY/ON EJECT

2-2

Samsung Electronics

Alignment and Adjustment

2-1-2 SW718 (TEST) location for adjustment mode setting

Fig. 2-2 Main PCB (Top View)

PRESS

Alignment and Adjustment

Samsung Electronics

2-3

2-2 Mechanical Adjustment

Note : Refer to the Mechanical Manual “DX-9R (AC68-00001A)” for the adjustment and confirmation of

ass’y full 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. 2-3 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) Press the “SW718 (TEST)” button on Main PCB to set the adjustment mode. (See Fig. 2-2)

3) Press the “5” button of remote control then adjustment 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.

2-4

Samsung Electronics

Alignment and Adjustment

2-3 Head Switching Point Adjustment

1) Playback the alignment tape.

2) Press the “SW718 (TEST)” button on Main PCB to set the adjustment mode. (See Fig. 2-2)

3) Press the “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) Press the “SW718 (TEST)” button on Main PCB to set the adjustment mode. (See Fig. 2-2)

2) Press the “MENU” button on the remote control about 5 seconds then option setting display is appeared. (See Fig. 2-4 and 2-5)

3) Select the option number (See Table 2-1 ; Page 2-5) of corresponding model with “FF” and “REW” button on the remote control.

4) If selecting the option number is completed, press the “PLAY” button of remote control. (If “PLAY” button is pressed, the selected number is changes reversed color. ; See Fig. 2-4 and 2-5)

5) Press the “OK (VCR)”, “MENU (VCP)” button of remote control again to store the option number. (“PLEASE WAIT” is displayed for a second as shown Fig. 2-6, 2-7 and this setting is completed.)

6) Turn the Power off.

1) NVRAM Option is adjusted at production line basically.

2) In case Micom (IC601) and NVRAM (IC605 ; 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.)

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 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

OPTION DIODE

CNG : SAVE : OK

Fig. 2-4 (VCR)

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 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

OPTION DIODE

CNG : SAVE : MENU

Fig. 2-5 (VCP)

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 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

OPTION DIODE

CNG : SAVE : OK

PLEASE WAIT

Fig. 2-6 (VCR)

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 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

OPTION DIODE

CNG : SAVE : MENU

PLEASE WAIT

Fig. 2-7 (VCP)

Alignment and Adjustment

Samsung Electronics

2-5

COUNTRY MODELS OPTION NUMBER

RUSSIA SVR-433 6, 8, 11, 12, 17, 18, 22, 25, 30, 31, 32, 35, 41, 42, 45, 50, 54

SVR-233 6, 8, 11, 17, 18, 22, 25, 30, 31, 32, 34, 41, 42, 45, 50, 54

SVR-230B 8, 11, 17, 18, 22, 25, 30, 31, 32, 34, 37, 38, 41, 42, 50, 54

SVR-230W 8, 11, 17, 18, 22, 25, 30, 31, 32, 34, 37, 38, 41, 42, 50, 54

SVR-2301 8, 11, 17, 18, 22, 25, 30, 31, 32, 34, 37, 38, 42, 50, 54

SVR-131 8, 9, 10, 11, 17, 18, 22, 30, 31, 32, 34, 39, 42, 45

2-6

Samsung Electronics

Alignment and Adjustment

MEMO

Samsung Electronics 3-1

3. Exploded View and Parts List

3-1 Cabinet Assembly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

3-2 Mechanical Parts (Top Side) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

3-3 Mechanical Parts (Bottom Side) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Page

3-2

3-4

3-6

+ 23 hidden pages