Samsung CT26F7SWX/XAP Bedienungsanleitung

COLOR TELEVISION RECEIVER

Chassis : K15C

Model : CT26F7SWX/XAP

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.

ELECTRONICS

©Samsung Electronics Co., Ltd. JULY.2002

Printed in Korea

AA82-00088A

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 (IC902) 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 (IC902) Is Replaced

1. When IC902 is replaced all adjustment data

revert to initial values. It is necessary to

re-program this data.

2. After IC902 is replaced, warm up the TV for

10 seconds.

4-1-3 When CRT Is Replaced

1. Make the following adjustments AFTER set-

ting up after setting up purity and conver-

gence :

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 35(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 compo-

nents: ADJUST, OPTION , G2-ADJUST and

RESET.

3. Access the Adjustment Mode by pressing the

“VOLUME” keys ( Up or Down). The adjust-

ment parameters are listed in the accompany-

ing table, and selected by pressing the CHAN-

NEL 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>DSK>DVDB

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

SCT Sub Cont ras t 0 ~ 23

0~23

SBT Sub Bright nes s

BLR

Black Level offset Blue

BLB

Black Level offset Red

RG RedGain 0~63

GG Green Gain 0 ~ 63

0~63

BG Blue Gai n 0 ~ 63

VSL Ver t ical Slope 0 ~ 63

VS Ver t ical Shif t 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 Cat hode Drive Level 0 ~ 15

STT Sub Tint 0 ~ 7

AKB AKB On / off 0 ~ 1

0~1

00~1

0~3

PD L PAL Del ay 0 ~ 15

0~15

0~50

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 set t i ng 0 ~ 63

0~63

CAP Caption Position

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

Dynamic Skin Tone

DVD Bright Offset

MVOL

RP00

RP01

FMWS

AGC1

OMD

SCL

PWL

MUS

AGC

DSK

DVDB

(16)

(6)

(37)

(33)

(38)

(39)

(32)

(20)

(33)

W/B Adjustment

FIX

W/B Adjustment

Vertical Picture Adjusment

FIX

Vertical Picture Adjusment

Picture Adjusment

FIX

FIX (Mono)

FIX (Nomal)

FIX (No Crrection)

FIX (Off)

FIX (100%)

FIX (Mono)

FIX

ONO SD F U N C T I ON R A N G E I N I T I A L D AT A SETTING RE M ARK

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

AV Option

DEMO

SETTING

OFF

STEREO

OFF

NOR/ZOOM

OFF

ENGLISH

OFF

INTERNAL

AV + DVD

OFF

- 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

- DVD, S-VHS Option

- DEMONSTRATION On/Off

REMARK

Alignment and Adjustments

4-4 Samsung Electronics

4-3 Other Adjustments

4-3-1 General

1. Usually, a color TV needs only slight touch-

up 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, per-

form the purity and convergence adjustments

described below.

3. Use the specified test equipment or its equiva-

lent.

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 isola-

tion transformer.

4-3-2 Automatic Degaussing

A degaussing coil is mounted around the pic-

ture 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 sec-

ond after the power is switched ON. If the set

has been moved or turned in a different direc-

tion, 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 cur-

rent).

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 con-

trols to maximum.

7. Loosen the clamp screw holding the yoke.

Slide the yoke backward or forward to pro-

vide 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

4 Pole Magnet

6 Pole Magnet 2 Pole Magnet

Clamper

Screw

2 POLE

PURITY

YOKE

CLAMP

SCREW

6 POLE

CONVERGENCE

4 POLE

CONVERGENCE

ADJ

(VE

Fig. 4-3 Center Convergence Adjustment

31m/m

Vertical Green Belt

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 dis-

played 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 .

Alignment and Adjustments

Samsung Electronics 4-7

4-3-8 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 mag-

nets, 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. 4-5).

Fig. 4-5 Center Convergence Adjustment

RED

BLUE

RED

4-Pole Magnet Movement

GREEN

RED/BLUE

GREEN

6-Pole Magnet Movement

4-3-9 RF AGC Adjustment

Set the AGC data to 33 (Factory Mode).

4-3-10 Sub-Color Adjustment

Set data to (Factory Mode).

4-3-11 Geometry Adjustment

SC →VS→VA→VSL→HS

1. Input a lion head pattern.

2. Set the SC (S-Correction) as 35 and VS(Vertical

Shift) 31 so that the lion head circle becomes

oval.

3. Adjust with VA (Vertical Amplitude) so that

the top margin of the picture is 4.

Fig. 4-7

4. Adjust with VSL (Vertical-Slope) so that the

bottom margin of the picture is 4.

Fig. 4-8

5. Adjust with HS (Horizontal Shift) so that the

lion-head pattern and CRT centers are aligned.

Fig. 4-9

6. Adjust HS (Horizontal Shift) so that the left

and right margins of the picture are 5.

Alignment and Adjustments

4-8 Samsung Electronics

PSR

NSR 20

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