Samsung CS21K9MLDC-DWP Service Manual

COLOR TELEVISION RECEIVER

Chassis : KS1B(P) Model : CS21K9MLDC/DWP

COLOR TELEVISION RECEIVER CONTENTS

Precautions

Specifications and IC Data

Disassembly and Reassembly

Alignment and Adjustment

Troubleshooting

Exploded View and Parts List

Electrical Parts List

Block Diagram

Wiring Diagram

Schematic Diagrams

10.

Alignment and Adjustments

Samsung Electronics 4-1

4. Alignment and Adjustments

4-1 Preadjustment

4-1-1 Factory Mode

1. Do not attempt these adjustments in the Video Mode.

2. The Factory Mode adjustments are necessary when either the EEPROM (IC202) or the CRT is replaced.

3. Do not tamper with the “Adjustment” screen of the Factory Mode menu. This screen is intended only for factory use.

4-1-2 When EEPROM (IC202) Is Replaced

1. When IC202 is replaced all adjustment data revert to initial values. It is necessary to re-program this data.

2. After IC202 is replaced, warm up the TV for 10 seconds.

4-1-3 When CRT Is Replaced

1. Make the following adjustments AFTER setting up after setting up purity and convergence :

White Balance Sub-Brightness Vertical Center Vertical Size Horizontal Size Fail Safe (This adjustment must be the last step).

2. If the EEPROM or CRT is replaced and set SC as 30(factory mode).

4-2 Factory/Service Mode

4-2-1 Procedure for the “Adjustment” Mode

1. This mode uses the standard remote control. The Service Mode is activated by entering the following remote-control sequence :

(1) DISPLAY → FACTORY.

(2) STAND-BY → MUTE → 1 → 8 → 2

→POWER ON.

2. The “SERVICE (FACTORY)” message will be displayed. The Service Mode has four components: ADJUST, OPTION , G2-ADJUST and RESET.

3. Access the Adjustment Mode by pressing the “VOLUME” keys ( Up or Down). The adjustment parameters are listed in the accompanying table, and selected by pressing the CHANNEL keys ( , ).

4. Selection sequences for the all system:

DOWN or UP key:

SCT>SBT>BLR>BLB>RG>GG>BG>VSL>VS> VA>HS>SC>CDL>STT>AKB>PDL>NDL> PSR>NSR>SCBT>VOL>CAP>MVOL>RP00> RP01>FMWS>AGC1>OMD>SCL>PWL> MUS>AGC

5. The VOLUME keys increase or decrease the adjustment values (stored in the non-volatile memory) when Adjustment Mode is cancelled.

6. Cancel the Adjustment Mode by re-pressing the “FACTORY” or “Power OFF” keys.

4-2-2 Main Adjustment Parameter

Alignment and Adjustments

4-2 Samsung Electronics

ONO SD F UN CT I ON R A N GE I NI TI AL D ATA SETTING RE MARK

SCT Sub Cont rast 0 ~ 23

SBT Sub Bright nes s

BLR

BLB

Black Level offset Red

Black Level offset Blue

0~23

0~63

(12)

(3)

(37)

(33)

RG Red Gain 0 ~ 63

GG Green Gain 0 ~ 63

BG Blue Gai n 0 ~ 63

VSL Vert ical Slope 0 ~ 63

VS Ver t ica l Shift 0 ~ 63

VA Vert ical Amplitude 0 ~ 63

HS Horizontal Shif t 0 ~ 63

SC S- Cor r ec t i on 0 ~ 63

CDL Cathode Drive Level 0 ~ 15

STT Sub Tint 0 ~ 7

AKB AKB On / off 0 ~ 1

PD L P AL Del ay 0 ~ 1 5

NDL NTSC Delay 0 ~ 15

PSR PAL Sub color 0 ~ 23

NSR NTSC Sub color 0 ~ 23

SCBT Screen Brighrtness 0 ~ 63

VOL Volume pre s et t i ng 0 ~ 63

CAP Caption Position

MVOL

RP00

RP01

FMWS

AGC1

OMD

SCL

PWL

MUS

AGC

Melody Sound Volume

Ratio Pre / overshoot

Window Selection Sound PLL

IF AGC Speed

Offset IF Demodulator

Soft Clipping Level

Peak White Limitting

Matrix USA

Automatic Gain Control

0~15

0~50

0~1

0~3

0~63

0~3

0~15

0~1

0~63

(38)

(39)

(32)

(25)

(33)

(27)

FIX

FIX (Mono)

FIX (Nomal)

FIX

FIX (Off)

FIX (100%)

FIX (Mono)

Alignment and Adjustments

Samsung Electronics 4-3

4-2-3 Option Bytes

In the Service Mode, various can be selected via the Option Table. Example:

Option Table : xx xx

OSD

VIDEO MUTE

AUDIO

E/W

ZOOM

AUTO POWER

AUDIO MUTE

LANGUAGE

HOTEL MODE

BULE SCREEN

2'nd SIF

V-CHIP

SETTING

OFF

STEREO

OFF

NOR/ZOOM

OFF

ENGLISH

OFF

INTERNAL

REMARK

- Video Mute On/Off changing the channel

- Audio Option (Mono / Steeo)

- E/W Option

- Picture Size Option

- Master S/w Option

- Audio Mute On/ Off without signal

- Inital Language agter Factory Reset

- Hotel mode On/ Off

- Bule Screen On/ Off without signal

- SIF Option at Mono sound

- V-CHIP On/Off

Alignment and Adjustments

4-4 Samsung Electronics

4-3 Other Adjustments

4-3-1 General

1. Usually, a color TV needs only slight touchup adjustment upon installation. Check the basic characteristics such as height, horizontal and vertical sync and focus.

2. The picture should have good black and white details. There should be no objectionable color shading; if color shading is present, perform the purity and convergence adjustments described below.

3. Use the specified test equipment or its equivalent.

4. Correct impedance matching is essential.

5. Avoid overload. Excessive signal from a sweep generator might overload the front-end of the TV. When inserting signal markers, do not allow the marker generator to distort test results.

6. Connect the TV only to an AC power source with voltage and frequency as specified on the backcover nameplate.

7. Do not attempt to connect or disconnect any wires while the TV is turned on. Make sure that the power cord is disconnected before replacing any parts.

8. To protect against shock hazard, use an isolation transformer.

4-3-2 Automatic Degaussing

A degaussing coil is mounted around the picture tube, so that external degaussing after moving the TV should be unnecessary. But the receiver must be properly degaussed upon installation.

The degaussing coil operates for about 1 second after the power is switched ON. If the set has been moved or turned in a different direction, disconnect its AC power for at least 30 minutes.

If the chassis or parts of the cabinet become magnetized, poor color purity will result. If this happens, use an external degaussing coil. Slowly move the degaussing coil around the faceplate of the picture tube and the sides and front of the receiver. Slowly withdraw the coil to a distance of about 6 feet before removing power.

4-2-4 RESET

The Reset Mode is used during factory inspection. Function Reset:

1. Picture Mode Custom

2. Sound Mode Custom

3. Auto Volume Off

4. Melody On

5. Surround Off

6. Turbo Sound Off

7. MTS Stereo

8. Language English

9. Caption Off

10. Timer Off

Alignment and Adjustments

Samsung Electronics 4-5

4-3-3 High Voltage Check

CAUTION: There is no high voltage adjustment on this chassis. The B+ power supply must be set to +125 volts (Full color bar input and normal picture level).

1. Connect a digital voltmeter to the second

anode of the picture tube.

2. Turn on the TV. Set the Brightness and

Contrast controls to minimum (zero beam current).

3. The high voltage should not exceed 30KV.

4. Adjust the Brightness and contrast controls to

both extremes. Ensure that the high voltage does not exceed 30KV under any conditions.

4-3-4 FOCUS Adjustment

1. Input a black and white signal.

2. Adjust the tuning control for the clearest pic-

ture.

3. Adjust the FOCUS control for well defined

scanning lines in the center area of the screen.

4-3-5 Cathode Voltage Adjustment

(Screen Adjustment)

1. Connect CRT socket pin GK to an oscilloscope

probe.

2. Input a gray scale pattern. (Use a pattern gen-

erator, PM5518)

3. Use the P mode key (on the remote control)

for the STANDARD picture.

4. Adjust the Screen VR (on the FBT) so that the

voltage on the oscilloscope becomes 125+2.5V (See Fig. 4-1).

4-3-6 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. 4-2.

4. Input a black and white signal.

5. Fully demagnetize the receiver 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. 4-3).

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. 4-1

125 2.5V

GND

Alignment and Adjustments

4-6 Samsung Electronics

4-3-7 White Balance Adjustment

Fig. 4-2 Convergence Magnet Assembly

Fig. 4-3 Center Convergence Adjustment

Fig. 4-4

(a) Set up

1. Warm up the TV for at least 30 minutes in the Aging Mode (OSD White). This mode is displayed by entering the following sequence:

DISPLAY

→FACTORY → FACTORY

2. Input a Toshiba pattern.

(b) Low-Light Adjustment

1. Set SBT to 1.0 fL in the Factory Service Mode with using CA100. See Fig. 4-4.

2. Adjust RG,BG so that the levels are suitable to each local area.

1. Set SCT to 35 FL in the Factory Service Mode with using CA100. See Fig. 4-4 .

6 Pole Magnet

Clamper

Screw

4 Pole Magnet

2 Pole Magnet

2 POLE PURITY

Vertical Green Belt

6 POLE

CONVERGENCE 4 POLE CONVERGENCE

YOKE CLAMP SCREW

ADJUST THE ANGLE (VERTICAL LINES)

31m/m

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