ct30d6p alignment and adjustments 3

Alignment and Adjustments

Samsung Electronics 3-1

3. Alignment and Adjustments

3-1 Preadjustment

1. Since there are no VRs in the K51A chassis, alladjustments after parts replacement must bedone in the Service Mode.

2. The Factory Mode adjustments are necessarywhen either the EEPROM (IC902) or the CRTis replaced.

3. Do not tamper with the Ò AdjustmentÓ screenof the Factory Mode menu. This screen isintended only for factory use.

4. WHEN EEPROM (IC902) IS REPLACED

(1) When IC902 is replaced, all adjustment datarevert to their initial values. It is necessary tore-program this data.

(2) After IC902 is replaced, warm up the TV for10 seconds.

Make the following adjustments AFTERsetting up purity and convergence:

White BalanceSub-BrightnessVertical CenterVertical SizeHorizontal Size (No use in 21Ó and 25Ómodels)

3-2 Factory (“SERVICE”) Mode

1. The set must be in Factory (ÒServiceÓ) Mode.Selection sequence:STAND-BY ® MUTE ® 1 ®8 ® 2 ® POWER ON

2. The Ò FACTORY MODEÓ message will be displayed. The Factory Modehas four components : Adjustment, MPX, PIP, Option Byte and FactoryReset.

3. Access the Adjustment Mode by pressing the ÒVOLUMEÓ keys ( , )The adjustment parameters are listed in the accompanying table. Select them by pressing the CHANNEL keys (▲,▼).

4. After completing the Factory Mode adjustments, turn the power switchOFF.

▼

▼

AGC 15VCO 62S B T 7SCT 11S C R 8S T T 8R G 3 2G G 3 2B G 3 2SCO 20VSL 26

V S 3 2V A 2 7H S 4 6EWA 52EWP 31EWC 32EWT 31MAT offP L A 6

*FACTORY*

¯ Press VOL

Press CH

Press VOL or

SBT 3

POWER OFF

AdjustmentMpx PatternOptionReset

▼

AGC 15VCO 62S B T 7SCT 11S C R 8S T T 8R G 3 2G G 3 2B G 3 2SCO 20VSL 26

¯ ▼

¯

¯

▼

▼

V S 3 2V A 2 7H S 4 6EWA 52EWP 31EWC 32EWT 31MAT offP L A 6

VSLN 30VSN 32VAN 32HSN 45EWAN 45EWPN 33EWCN 32EWTN 38

*SERVICE*

¯ Press VOL

Press CH

Press VOL or

SBT 3

POWER OFF

AdjustmentMTSPIPOptionReset

▼

AGC 15VCO 62S B T 7SCT 11S C R 8S T T 8R G 3 2G G 3 2B G 3 2SCO 20P L A 5

¯ ▼

¯

¯

▼

▼

VSLP 30VSP 32VAP 32HSP 39EWAP 46EWPP 33EWCP 32EWPT 38

VSLN 30VSN 32VAN 32HSN 45EWAN 45EWPN 33EWCN 32EWTN 38

AGC 15VCO 62S B T 7SCT 11S C R 8S T T 8R G 3 2G G 3 2B G 3 2SCO 20P L A 5

VSLP 30VSP 32VAP 32HSP 39EWAP 46EWPP 33EWCP 32EWPT 38

3-2-1 Adjustment

1. Selection sequence :STAND-BY ® MUTE ® 1 ® 8 ® 2 ® POWER ON

2. Example : Sub-bright Adjustment


3-2 Samsung Electronics

SZM368ET1 (R4027) SZM368ET2 (R4127)



MEMORY SPECIFICATION

765DWZ

8

63

2

7

0

7

32

32

32

14

25

26

34

46

51

24

32

32

5

OFF

87

00

13

46

32

275

295

35

275

295

1.4

2.4V

Table 3 - 1 Memory Specification

FUNCTION

A

D

J

U

S

T

M

E

N

T

OP

MPX

MODE(OSD)

AGC

VCO

SBT

SCT

SCR

STT

RG

GG

BG

SCO

VSL

VS

VA

HS

EWA

EWP

EWC

EWT

PLA

SEP

29D4WZ

8

63

2

7

0

4

32

32

32

14

26

32

29

48

33

34

32

32

0

OFF

95

00

13

46

32

275

295

40

275

295

1.4

2.4V

225BZ

8

63

2

7

0

4

20

20

20

14

24

32

36

46

47

4

32

32

6

OFF

82

00

OFF

OFF

OFF

275

295

45

275

295

1.4

2.4V

25D4WZ

8

63

2

7

0

4

32

32

32

14

23

32

27

41

32

36

32

32

0

OFF

85

00

13

46

32

268

275

40

277

283

1.4

2.4V

565BZ

8

63

2

7

0

4

20

20

20

14

24

32

36

46

47

4

32

32

6

OFF

82

00

OFF

OFF

OFF

275

295

45

275

295

1.4

2.4V

566BWZ

8

63

2

7

0

4

20

20

20

14

24

32

36

46

47

4

32

32

6

OFF

87

00

13

46

32

275

295

45

275

295

1.4

2.4V

228BWX

8

63

2

7

0

4

20

20

20

14

24

32

36

46

47

4

32

32

6

OFF

87

00

13

46

32

268

275

45

277

283

1.4

2.4V

RANGE

63

127

15

13

13

13

63

63

63

63

63

63

63

63

63

63

63

63

10

31

FF

FF

15

63

63

x

y

Y ± 5

x

y

Y ± 0.2

28B2

8

63

2

7

0

4

32

32

32

20

28

20

38

44

42

45

32

32

5

OFF

8F

03

13

46

32

275

295

33

275

295

1.4

2.4V

No

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

BYTE 0

BYTE 1

ATT

SPECTRAL

WIDEBAND

HIGH - LIGHT

LOW - LIGHT

WHITEBALANCE

ADJUSTMENT

MEASURING PULS ADJUSTMENT VOLTAGE

VIDEO MUTE

AUDIO MUTE

NO ATS

NO V - CHIP

NO VIDEO MUTE

NO AUDIO MUTE

ATS

V-CHIP

USA PAL M/N



3-2-2 Option Table

NOTE : The Option Adjustment must be done in the Service Mode.

3-2-2 (A) OPTION BYTE 00

Table 3-2 Option Byte 00

NAME

V-SYNC

AUTO ON

PIP

CATV

S-VIDEO

TONE

CRT

MPX

NOT USED

NOT USED

NO PIP FUNCTION

AIR/STD/HRC/IRC

NOT USED

NO TONE CONTROL

4 : 3 CRT

NOT USED

USED ( NO V-SYNC, POWER OFF)

USED

PIP FUNCTION

AIR/STD/HRC/AFN

USED

TONE CONTROL

12.8 : 9 CRT

USED

REMARK

ARMY : 1

3-2-2 (B) OPTION BYTE 01

BYTE : 00

D7

D6

D5

D4

D3

D2

D1

D0

FUNCTION

0 1

Table 3-3 Option Byte 01

NAME

AREA

LANGUAGE

NO VIDEO MUTE

NO AUDIO MUTE

ATS

V-CHIP

REMARK

SYSTEM/LANGUAGE

PAL

PAL

NT

NT

BYTE : 01

D7

D6

D5

D4

D3

D2

D1

D0

FUNCTION

0 1

00 : ENGLISH01 : SPANISH (SEDA)

02 : PORTUGUESE11 : NOT USED



3-2-4 Factory Reset

When Ò Factory ResetÓ is selected, the User-Control data reverts to the initial values.The User-Control data is available at MENU (picture, sound and the other functions).

Note : When Ò Factory ResetÓ is selected, the Factory Mode Data does not change.

Selection sequence :Stand-By ® MUTE ® 1 ® 8 ® 2 ® POWER ON

* FACTORY *

Press VOL Execute

Press CH ¯ ▼

¯ ▼

¯



* SERVICE *

Press VOL Execute

Press CH ¯ ▼

¯ ▼

¯



3-3 Other Adjustments

3-3-1 General

1. Usually, a color TV needs only slight touch-upadjustment upon installation. Check the basiccharacteristics such as height, horizontal andvertical sync and focus.

2. Observe the picture for good black and whitedetails. There should be no objectionablecolor shading. If color shading is present,perform the purity and convergenceadjustments described below.

3. Use the specified test equipment or itsequivalent.

4. Correct impedance matching is essential.

5. Avoid overload. Excessive signal from asweep generator might overload the front-endof the TV. When inserting signal markers, donot allow the marker generator to distort testresults.

6. Connect the TV only to an AC power sourcewith voltage and frequency as specified on thebackcover nameplate.

7. Do not attempt to connect or disconnect anywires while the TV is turned on. Make surethat the power cord is disconnected beforereplacing any parts.

8. To protect against shock hazard, use anisolation transformer.

SZM368ET1 (R4027) SZM368ET2 (R4127)



3-3-2 Automatic Degaussing

A degaussing coil is mounted around thepicture tube, so external degaussing aftermoving the TV should be unnecessary.However, the receiver must be properlydegaussed upon installation.

The degaussing coil operates for about 1second after the power is switched ON. If theset has been moved or turned in a differentdirection, disconnect its AC power for at least10 Minutes.

If the chassis or parts of the cabinet becomemagnetized, poor color purity will result. Ifthis happens, use an external degaussing coil.Slowly move the degaussing coil around thefaceplate of the picture tube and the sides andfront of the receiver. Slowly withdraw the coilto a distance of about 6 feet before removingpower.

3-3-3 High Voltage Check

CAUTION : There is no high voltageadjustment on this chassis. The B+ powersupply must be set to either +135V or +125V(for 20Ó screen). Conditions : Full color barinput and normal picture level.

1. Connect a digital voltmeter to the secondanode of the picture tube.

2. Turn on the TV. Set the Brightness andContrast controls to minimum (zero beamcurrent).

3. The high voltage must not exceed 29.5KV.

4. Adjust the Brightness and Contrast controls toboth extremes. Ensure that the high voltagedoes not exceed 29.5KV under any conditions.

3-3-4 FOCUS Adjustment

1. Input a black and white signal.

2. Adjust the tuning control for the clearestpicture.

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

3-3-5 B+ Line Check

There are 3 power modes :

1. ÒAÓ : When AC power supply is connected ; Ò Stand-ByÓ mode.

2. ÒBÓ : When Ò Set Power-ONÓ button ispressed.

3. ÒCÓ : Driven by FBT.

Each voltage is marked on its lead-in wire.( )

3-3-6 F/S (Fail Safe) Circuit Check

1. The failsafe circuit check is the final step afterservicing.

2. Turn the power switch on and adjust thescreen for ÒNormalÓ.

3. Temporarily short Pin R and Pin X on thechassis (RX05, RX04). Sound and picture willdisappear.

4. The TV should remain in this state. Thisshows that the failsafe circuit is workingproperly.

5. To restore picture and sound, temporarily turnoff the AC power supply. After about 30seconds, switch power ON.21”± 1

27.5KV

25”

29.5KV

29”

29.5KV

29”± 1

29.5KV

SIZE

MAX

H-VOLTAGE



3-3-7 Color Purity Adjustment

1. Warm up the receiver. Operate it for 20minutes, with the Brightness control set tomaximum.

2. Fully degauss the receiver. Use an externaldegaussing coil.

3. Roughly adjust convergence by rotating theConvergence Magnet.

4. Input a black and white signal.

5. Loosen the Deflection Yoke clamp screw, andmove the Deflection Yoke as close to thepurity magnet as possible.

6. Loosen the Purity Magnet clamp. Adjust thepurity magnet so that the vertical green rasteris precisely at the center of the screen. Thentighten the clamp.

7. Slowly move the Deflection Yoke forward, andadjust it for the best overall green screen.

8. Tighten the Deflection Yoke clamp screw.

Fig. 3-1 Tube Assembly

RUBBER WEDGES

30

30

LOCATION

DEFLECTIONYOKE

30

RUBBER WEDGE

ADHESIVE

RUBBERWEDGESKIT

RUBBERWEDGES

PURITY ANDCONVERGENCEMAGNET ASS'Y

CRT

DEFLECTIONYOKE

TAPECLOTHGRASS

(1-3/16")31 mm

Fig. 3-2 Purity and Convergence Magnets

2 POLEPURITY

YOKECLAMPSCREW

6 POLECONVERGENCE

4 POLECONVERGENCE

ADJUST THE ANGLE(VERTICAL LINES)

FIXED

ROTATE TWO TABSAT THE SAME TIME

(HORIZONTAL LINES)



3-3-8 Center Convergence Adjustment

Note: Before attempting any convergenceadjustment, make sure that the receiver hasbeen powered ON for at least twenty minutes.

1. Input a crosshatch pattern from a color bar generator.

2. Adjust the Brightness and Contrast controlsfor a well defined pattern.

3. Adjust the two tabs of the 5-pole magnets.Change the angle between the tabs, andsuperimpose red and blue vertical lines in thecenter area of the picture screen.

4. Next, turn both tabs at the same time. Keepthe angle between the tabs constant, andsuperimpose the red and blue horizontal linesat the center of the screen.

5. Adjust the two tabs of the 6-pole magnets. Superimpose the red/blue lines on the green. Adjusting the angle affects the horizontallines.

6. Repeat adjustments 3, 4 and 5. The dotmovement is complex because the 4-pole and6-pole magnets interact.

Fig. 3-3 Center Convergence Adjustment

REDBLUE

BLUE

RED

4-Pole Magnet Movement

GREENRED/BLUE

RED/BLUE

GREEN

6-Pole Magnet Movement

3-3-9 AGC Adjustment

1. Input a COLOR-BAR pattern. (CH2)

2. Set the RF input signal to 70 dBmV.

3. Use Generator for PM5518 & PM5418.

4. Set AGC (in the Factory Mode) so that the DC level of IC TDA8377Pin 53 is 3.0±0.05V.

3-3-10 AFT (VCO Adjustment)

1. Input an AGC adjustment signal.

2. Select Factory Mode VCO and press the MUTE key one time.

3. GEOMATRIX adjustments

VS EWAVA EWPVSL EWCHS EWT



3-3-11 White Balance Adjustment

3-3-11 (A) SCREEN ADJUSTMENTS

1. Input a TOSHIBA pattern.

2. Check R506 ÒGÓ pin on the CRT PCB with anoscilloscope.

3. Enter the Horizontal Line Mode.

4. Adjust the Screen Control on the FBT so thatthe waveform of the 21st line is DC 2.0(±0.5)V.

3-3-11 (B) HIGH-LIGHT ADJUSTMENT

1. NOTE : If a color analyzer is not available,then approximate the following coloradjustments Òby eyeÓ.


3. Set high-light to 290/300 (X,Y) with a coloranalyzer.

4. Set low-light to 1.4F/L.

5. Adjust RG, BG and set GG to step 32.

3-3-11 (C) SUB-CONTRAST ADJUSTMENT

1. Set SCT so that the brightness level in high-light is 40 F/L (for a 29Ó SCREEN).

3-3-11 (D) SUB-BRIGHTNESS ADJUSTMENT


2. Set SBT so that the brightness level in low-light is 1.4 F/L.

3-3-11 (E) SUB-COLOR ADJUSTMENT

Set ÒSCRÓ in the Service Mode to step 0.

3-3-11 (F) SUB-TINT ADJUSTMENT

Set ÒSTTÓ in the Service Mode to step 4.

3-3-11 (G) VERTICAL SIZE ADJUSTMENT

1. Input a lion head pattern.

2. Set VS to 32 in the Factory Mode.

3. Set VA so that the top margin is 4.0. Adjust SLso that the bottom margin is 4.0. If the topand bottom margins are different, adjust VA sothat their sum is 8.0.

3-3-11 (H) HORIZONTAL SHIFT ADJUSTMENT

1. Input a lion head pattern.

2. Adjust ÒHSÓ in the Service Mode so that theleft and right margins of the lion head patternare 5.0 ± 0.5 : CT633BW/CT683BW, 6.3 ± 0.5 :CT566BV/CT566BW/CT568BW/CT765DW/CT766DW/CT762B/CT25D4/CT29D4.

<TOSHIBA PATTERN>

High-Light

Low-LightSIZE

DC

29”

2.4

26”

2.4

22”

2.4

HEIGHT

LIGHT

30”

33 ± 5

29”

37 ± 5

26”

45 ± 5

22”

45 ± 5

For the power system of K51A chassis, alloutput voltages remain the same duringstand-by. So, to reduce power consumption, itis necessary to cut the leakage current flowingthrough FBT B+ (130V) and tuner port VT (33V)

during stand-by (Picture OFF).

The power consumption reduction circuit cutsleakage current. A P-channel MOSFET is usedas a switching element. The operating principles are as follows:

1. In stand-by, the voltage of the power controlport (micom IC) becomes low (0V). Duringpower ON, however, it becomes high (over4V).

2. The voltage between S-G (Q801 P-channelMOSFET) should be over 3.5V, so that the S-Dcurrent (Q801) can keep flowing.

3. When the voltage of the power control portbecomes low, the current flowing throughQ903 (R812) is cut.

4. When the voltages across R803 become lessthan 3.5V, the S-D current (Q801) is cut.

5. DZ809 is required for protecting the G-port(Q801).

3-3-13 Precautions when servicing

1. Q801 can sustain a continuous flow of 11ADC. If Q801 is destroyed, the S-D is shorted. But, the TV functions normally and only thepower consumption during stand-by increases (2.5W® 6W).

2. No Picture ON : Q903 is open or DZ809 isshorted. At this time, check both Q903 andDZ809. If the power-consumption reductioncircuit does not work normally after checkingboth Q903 and DZ809, then short the S-Dports of Q801.



3-3-12 Power Consumption ReductionCircuit during Stand-by (Option)

OmA

R801

FBT B+

OmATUNER 33V

OmA

Q903

130 RECTIFIED

DZ809

Q801SFP9640

R812

R91010K

POWERCONTROL

ct30d6p alignment and adjustments 3

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