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三星TW20P14XBW

Television Video Cassette Recorder

Chassis : C17A (TS-10 )Model :

TW20P14X/BWT

Television Video Cassette Recorder CONTENTS

Precautions Specifications

Disassembly and Reassembly Alignment and Adjustment Troubleshooting

Exploded View and Parts List Electrical Parts List Block Diagram Wiring Diagram Schematic Diagrams

1.2.3.4.5.6.7.8.9.10.

ELECTRONICS

?Samsung Electronics Co., Ltd. Feb. 2003 Printed in Korea

Precautions

1.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.

2.Immediately before handling any semicon

ductor 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.)

3.After removing an ESD-equipped assembly,

place it on a conductive surface such as

aluminum foil to prevent accumulation of

electrostatic charge.

4.Do not use freon-propelled chemicals. These

can generate electrical charges that damage

https://www.wendangku.net/doc/213964416.html,e only a grounded-tip soldering iron when

soldering or unsoldering ESDs.

https://www.wendangku.net/doc/213964416.html,e only an anti-static solder removal device.

Many solder removal devices are not rated as “anti-static”; these can accumulate sufficient

electrical charge to damage ESDs.

7.Do not remove a replacement ESD from its

protective package until you are ready to

install it. Most replacement ESDs are

packaged with leads that are electrically

shorted together by conductive foam,

aluminum foil or other conductive materials.

8.Immediately before removing the protective

material from the leads of a replacement ESD, touch the protective material to the chassis or circuit assembly into which the device will be installed.

9.Minimize body motions when handling

unpackaged replacement ESDs. Motions such as brushing clothes together, or lifting a foot

from a carpeted floor can generate enough

static electricity to damage an ESD.

Precautions

2. Specifications

T he descriptions and characteristics given in this booklet are given for information purposes only and are subject to modification without notice.

TELEVISION PART

Colour systems PAL(option) / SECAM(option) (UK;PAL)

TV standards L/L’(option), B/G(option), D/K(option) (UK;I)

Number of channels100 programmes

Reception range/cable TV Hyperband/interband tuner

Aerial input 75 Ohms, coaxial cable

VCR PART

Format VHS standard

(PAL / SECAM(option) / MESECAM(option) / NTSC in playback only) Heads Video: 2 rotary heads, LP(option), 4 Heads(option)

Audio/Control: 1 stationary head (linear)

Erase: 1 full track erase head

System Video Normal CCIR

System Audio Mono / NICAM&A2-STEREO Luminance FM azimuth recording

Colour Down converted subcarrier phase shifted direct recording

FF/REW time Less than 100 seconds in FF with E-120

Wow and flutter (WTD)0.4% maximum (SP)

Frequency response100 Hz - 8 KHz

GENERAL

Power supply 220-240V~, 50Hz (110-260V~, 50/60Hz; option),(160-300V~50/60Hz;Russia) Consumption14”15” (50W)

20”/21” (60W)

Audio output power14”15” (2W)

20” (2W)

21” (1.0Watts x 2)

Number of loudspeakers14”/15”/20” (1)

21” (2)

Tube size14” (37cm/34cmV)

15” (39cm/36cmV)

20” (51cm/48cmV)

21” (55cm/51cmV)

Tube type BLACK MATRIX

Sockets 1 full RGB SCART on the rear

1 RCA input (audio and video) on the front

Earphones output (3.5 mm mini-jack)

1 aerial/cable TV coaxial input

Dimensions (W x D x H)14” (368 x 390 x 381)

15” (411 x 401 x 417)

20” (486 x 473 x 485)

21” (520 x 495 x 508)

Weight14” (11.1 kg)

15” (14.8 kg)

20” (19 kg)

21” (23.4 kg)

Operating temperature5°C - 40°C (41°F - 104°F)

Relative humidity10% - 75%

MEMO

Alignment and Adjustments (Electrical)

4-2-2 Main Adjustment Parameters

OSD ABBREVIATION

AGC

QSS

SBT

SCT

SCR

STT

TCT

PVS

PHS

NVS

NHS

CDL

SCL

PWL

OMD

BLR

BLB

AGC2T

YD RANGE

INITIAL DATA

NOTE : PVS, PVA, PHS, NVS, NVA,NHS parameters must be aligned using both the 50 Hz and 60 Hz vertical-field rates.

4-2-3 AGING Mode (Reference Only)

This pattern is used for pre-heating the CRT during manufacturing--it is accessed in the

factory by twice pressing the "FACTORY" key .

Even if the TV power is cut off, the Aging Mode is not cancelled.

The "AGING" marking is displayed on the screen.

The AGINGmode is cancelled by repressing the "FACTORY" key.

Alignment and Adjustments (Electrical)

BYTE 1

23456789

ITEM LANGUAGE SYSTEM TUNER HELP MESSAGE VCR HEAD G-CODE ATS OPTION VPS/PDC TTX

0EUROPE/URSSIA CF/CI/CW/CX/CB/CII

1/2ON/OFF 2HD/2HDLP/4HD/HIFI SHOWVIEW/VIDEO PLUS/NONE

ON/OFF PDC/VPS/NONE ON/OFF

BYTE 123456789

ITEM Contrast Bright Sharpness Color Tint Volume Program Number Color System Sound System 3DB LNA Panel Lock Language Clock Timer On Time Sleep PICTURE MODE

4-2-4 Option

Alignment and Adjustments (Electrical)

Alignment and Adjustments (Electrical) 4-4-4 FOCUS Adjustment

1. Input a black and white signal.

2. Adjust the tuning control for the clearest picture.

3. Adjust the FOCUS control for well defined scanning lines in the center area of the screen.

4-4-5 Screen Adjustment

1. Turn to the ACTIVE channel.

2. Adjust the VR screen for a normal picture is (no blooming or flyback line).

3. Adjust the FOCUS control for well defined scanning lines in the center area of the screen.

4-4-6 Purity Adjustment

1. Warm up the receiver for at least 20 minutes.

2. Plug in the CRT deflection yoke and tighten the clamp screw.

3. Plug the convergence yoke into the CRT and set in as shown in Fig. 4-1.

4.Input a black and white signal.

5.Fully demagnetize the receive by applying an external degaussing coil.

6. Turn the CONTRAST and BRIGHTNESS controls to maximum.

7. Loosen the clamp screw holding the yoke. Slide the yoke backward or forward to provide

vertical green belt. (Fig. 4-2).

8. Tighten the convergence yoke.

9. Slowly move the deflection yoke forward, and adjust for the best overall green screen.

10.Temporarily tighten the deflection yoke.

11.Produce blue and red rasters by adjusting the low-light controls. Check for good purity

in each field.

12.Tighten the deflection yoke.

Fig.4-2 Center Convergence Adjustment

4-4-7 White Balance Adjustment

4-4-7 (A) HIGH-LIGHT ADJUSTMENT

1.Input either a Lion Head or a “pure white” pattern.

2.Warm up the TV for 30 minutes.

3.Check the data in the Service Mode

4.Adjust RG, BG in the Factory Mode.

4-4-7 (B) LOW-LIGHT ADJUSTMENT

1.Automatically accomplished during the high-light adjustment.

Alignment and Adjustments (Electrical)

4-4-8 Center Convergence Adjustment

1.Warm up the receiver for at least 20 minutes.

2.Adjust the two tabs of the 4 pole magnets to

change the angle between them. Superimpose the red and blue vertical lines in the center

area of the screen.

3. Adjust the Brightness and Contrast controls for

a well defined picture.

4. Adjust the two-tab pairs of the 4 pole magnets,

and change the angle between them.

Superimpose the red and the blue vertical

lines in the center area of the screen.5.Turn the both tabs at the same time, keeping

the angle constant, and superimpose the red

and blue horizontal line in the center of the

screen.

6.Adjust the two-tab pairs of the 6-pole magnets

to superimpose the red and blue line onto the green. (Changing the angle affects the vertical lines, and rotating both magnets affects the

horizontal lines.)

7.Repeat adjustments 2~6, if necessary.

8. Since the 4-pole magnets and 6-pole magnets

interact, the dot movement is complex

(Fig. 4-3).

Alignment and Adjustments (Electrical)

Fig. 4-6 Color bar signal of alignment tape (75% Color Bars)

Alignment and Adjustments (Electrical) 4-5-3 PROGRAM SW

X : DON’T CARE

MEMO

Troubleshooting 5. Troubleshooting

5-1 No Power (No Picture on)

Troubleshooting