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KCT52A Chassis

SAMSUNG GROUP

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TOC

Power Supply Description

Start up Circuit

When AC cord is plugged in, the initial current starts flowing
through the path as shown, and charges C852.

When Vin reaches about 8V, the control circuit is activated,
and the oscillation begins.

D1, D2 windings provide the necessary back-up current to Vin
after the control circuit is activated as the initial current alone
can not sustain the current consumed by the control IC.

The DI winding voltage is set between the threshold of Stop
voltage (Vin=5.1 V) and Overvoltage (Vin=10V).

As shown in the graph, D1 and D2 winding voltages are
necessary to power up the control IC.

Содержание KCT52A

Страница 1: ...GROUP l SAMSUNG GROUP O O TOC 1 CTV Training Manual KCT52A Chassis 20 Inch TXE2045 TXE2046 25 Inch TXE2545 TXE2546 TXE2549 27 Inch TXE2745 TXE2746 TXE2749 Samsung Electronics America Product Support Department l ...

Страница 2: ...C Pin Description IC Pin Voltage Waveforms Troubleshooting No Color Horizontal Deflection Circuit Horizontal Deflection Circuit Description Vertical Deflection Circuit Vertical Deflection Circuit Description Troubleshooting No Vertical Scan Horizontal Line Sound Circuit IC Block Diagram Description Troubleshooting No Sound CRT Drive Circuit CRT Drive Circuit Description Troubleshooting No Raster S...

Страница 3: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 3 Block Diagrams ...

Страница 4: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 4 Power Supply Circuit ...

Страница 5: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 5 Power Supply Circuit ...

Страница 6: ...ector 2 GND Switching TR Emitter 3 Base Switching TR Base 4 Sink Control S TR base current 5 Drive Supply S TR base current 6 OCP Over current Protection 7 Feedback Output voltage Feedback 8 Inhibit Off time control latch up control 9 B Main Power Supply IC801 STRS6709 Internal Parameter R1 T on trimming C1 3300 pF R2 T off trimming C2 0 01 uF R3 1 K ohm C3 820 pF R4 0 7 ohm C4 0 01 uF R5 100 ohm ...

Страница 7: ...e printout 5 See printout See printout 6 See printout See printout 7 See printout See printout 8 See printout See printout 9 6V See printout HC801 Pin Voltage Waveform Pin No Stand by Power On 1 See printout See printout 2 See printout See printout 3 See printout See printout 5 See printout See printout 6 6V See printout HC802 Pin Voltage Waveform Pin No Stand by Power On 1 0 V 0 V 2 11 1 V 12 5 V...

Страница 8: ...V 12 2 V 2 13 1 V 13 7 V 3 2 9 V 3 V 4 0 V 3 8 V 6 4 7 V 4 7 V 8 0 V 8 V 9 5 V 5 V Output2 Pin 8 is disabled if Pin 4 is less than 0 8 V The Reset Pin 6 goes low if output1 Pin 9 is less than 4 85 V and goes high if Pin 9 is higher than 4 9 V The cap C810 connected to Pin 3 determines delay time Td of Rest Pin going high or low HC853 Pin Voltage Waveform Pin No Stand by Power On 1 12 9 V 13 7 V 2 ...

Страница 9: ...he control circuit is activated and the oscillation begins D1 D2 windings provide the necessary back up current to Vin after the control circuit is activated as the initial current alone can not sustain the current consumed by the control IC The DI winding voltage is set between the threshold of Stop voltage Vin 5 1 V and Overvoltage Vin 10V As shown in the graph D1 and D2 winding voltages are nec...

Страница 10: ... charging at almost 0 V through R1 When the voltage of C1 approaches 0 7V the output of oscillator is reversed and the PTR is turned off As the PTR is turned off C1 is rapidly discharged by the oscillator and C2 starts to discharge through R2 When the voltage of C2 decreases to approx 1V the output of the oscillator reverses again and the PTR turned on On time control is done by changing C1 chargi...

Страница 11: ...tile PTR will remain off mode Fig 2 When the PTR is off the primary energy is transferred to the secondaries including DI winding which voltage is set to higher volatile than Vth2 in normal operation This transferred energy starts charging Cinh through D3 and Rinh When INH voltage reaches Vth C2 will discharge quickly and remain low even after the energy transfer is com pleted became the INH volta...

Страница 12: ... loss When Proprot drive circuit generates a positive pulse out of Pin 5 the base current to Pin 3 base of PTR develops and increases linearly because of R813 and C851 combination This base current drives PTR to turn on When the driving pulse goes low the R813 and C851 combi nation reverse biases PTR base completely to make sure the the PTR is off The relation between Vbe IB and Vce Ic of the PTR ...

Страница 13: ...cription OCP Over Current Protection Circuit Description The overcurrent protection is performed by the pulse by pulse system which directly detects the collector current of the PTR The detect reference voltage to the comparator is set to 1 V above the control IC ground Pin 2 ...

Страница 14: ...high voltage appears on the load line due to the open loop in the feedback path Overheat Protection Circuit Description When the control IC s temperature reaches over 150 degree C the latch circuit is activated Actual temperature detection is done through the control cir cuit mounted on the IC frame internally Latch Circuit Description The latch circuit stops oscillation of the control IC when OVP...

Страница 15: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 15 POWER ON IC801 PIN 1 POWER ON IC801 PIN 3 POWER ON IC801 PIN 2 POWER ON IC801 PIN 4 ...

Страница 16: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 16 POWER ON IC801 PIN 5 POWER ON IC801 PIN 7 POWER ON IC801 PIN 6 POWER ON IC801 PIN 8 ...

Страница 17: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 17 POWER ON IC801 PIN 9 STAND BY IC801 PIN 2 STAND BY IC801 PIN 1 STAND BY IC801 PIN 3 ...

Страница 18: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 18 POWER ON IC801 PIN 4 STAND BY IC801 PIN 6 STAND BY IC801 PIN 5 STAND BY IC801 PIN 7 ...

Страница 19: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 19 POWER ON IC801 PIN 8 POWER ON IIC801 PIN 1 STAND BY IC801 PIN 9 POWER ON IIC801 PIN 2 ...

Страница 20: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 20 POWER ON IIC801 PIN 3 STAND BY IIC801 PIN 1 POWER ON IIC801 PIN 5 STAND BY IIC801 PIN 2 ...

Страница 21: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 21 STAND BY IIC801 PIN 3 POWER ON Q801 B STAND BY IIC801 PIN 5 POWER ON Q801 C ...

Страница 22: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 22 POWER ON Q801 E STAND BY Q801 C STAND BY Q801 B STAND BY Q801 E ...

Страница 23: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 23 POWER ON IC851 C STAND BY IC851 C POWER ON IC851 E STAND BY IC851 E ...

Страница 24: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 24 POWER ON DZ803 STNAD BY DZ803 ...

Страница 25: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 25 POWER ON T801 PIN 4 POWER ON T801 PIN 7 POWER ON T801 PIN 6 POWER ON T801 PIN 8 ...

Страница 26: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 26 POWER ON POINT A POWER ON POINT B POWER ON POINT C ...

Страница 27: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 27 POWER ON POINT D STAND BY T801 PIN 6 STAND BY T801 PIN4 STAND BY T801 PIN7 ...

Страница 28: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 28 STAND BY T801 PIN 8 STAND BY POINT B STAND BY POINT A ...

Страница 29: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 29 STAND BY POINT C STAND BY POINT D ...

Страница 30: ...Troubleshooting No Raster and No Sound KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 30 ...

Страница 31: ...Micom Circuit KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 31 ...

Страница 32: ...V Jack plugged in 22 24 R G B OUTPUT OSD RGB output 25 BLK OUTPUT OSD blanking signal output 26 H SYNC INPUT H Sync input 27 V Sync INPUT V Sync input 28 OSC IN C IN INPUT Composite video input 29 OSC OUT LOOP IN OUT Loop out of Pin 28 31 32 XTAL 2 1 IN OUT Oscillation for Micom Operation 33 RESET INPUT Micom initialization 34 VDD INPUT Main B 35 37 PIP AV0 AV1 OUTPUT PIP TV AV Selection 36 IR IN ...

Страница 33: ...IC Pin Voltage Waveforms Micom IC901 Pin Description KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 33 ...

Страница 34: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 34 MICOM PIN 2 P std Movies MICOM PIN 10 No key pressed MICOM PIN 9 No Key Pressed STAND BY T801 PIN 22 24 Menu key pressed ...

Страница 35: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 35 MICOM PIN 26 MICOM PIN 28 MICOM PIN 27 MICOM PIN 31 ...

Страница 36: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 36 MICOM PIN 32 MICOM PIN 41 42 MICOM PIN 36 Mute key pressed ...

Страница 37: ...Tuner Circuit KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 37 ...

Страница 38: ...er PLL Data Format MSB LSB Address Byte 1 1 0 0 0 MA1 MA0 0 A Divider Byte1 0 N14 N13 N12 N11 N10 N9 N8 A Divider Byte 2 N7 N6 N5 N4 N3 N2 N1 N0 A Control Byte 1 CP T2 T1 T0 RSA RSB OS A Bandswitch Byte X X X X BS4 BS3 BS2 BS1 A MA1 MA0 Programmable address bits N14 N0 Programmable divider bits CP Charge pump current CP 0 50 uA CP 1 250uA T2 T1 T0 Test bits RSA RSB Reference divider ratio select b...

Страница 39: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 39 POINT A POINT C POINT B POINT D ...

Страница 40: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 40 IF Chroma Video Circuit ...

Страница 41: ...l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 41 IF Chroma Video circuit ...

Страница 42: ...IC operation 10 CHROMA INPUT Chroma signal input 11 T CVBS INPUT Luminance signal input 12 Main B Main Power Supply 13 INT CVBS INPUT Composite video input 14 GND Ground 15 AUDIO OUT NC 16 DECOUPLING FILTER To remove noise in VCO loop output 17 EXT CVBS INPUT External composite video input Terminate by cap 18 BLACK CURRENT INPUT Cathode block beam level input for compensation 19 21 R G B OUTPUT RG...

Страница 43: ...3 PHI1 2 FILTER Filters to stabilize loop output response 44 GND Ground 45 East West Drive Pincushion correction wave output 46 47 Vert Drive Pos Neg Vertical drive pulse out in balance phase 48 49 IF Input PIF Input 50 EHT OVP Overheat Overvoltage detection 51 VERT SAWTOOTH Vertical drive pulse amplitude control 52 REF CURRENT INPUT Reference current output for vertical drive circuit 53 AGC DECOU...

Страница 44: ... INPUT See print out 11 Y CVBS INPUT See print out 12 MAIN B 8 V 13 INT CVBS INPUT See print out 16 DECOUPLING FILTER 3 5 V 17 EXT CVBS INPUT 3 3 V 18 BLACK CURRENT INPUT See print out 19 21 R G B OUTPUT See print out 22 ABL Cont Bright Max 2 8 V Cont Max Bright Center 3 25 V Cont Bright Min 3 7 V 23 25 R G B INPUT 26 RGB INSERTION SWITCH See print out 27 Y INPUT See print out 28 Y OUTPUT See prin...

Страница 45: ...e print out INPUT 42 43 PHI 1 2 FILTER See print out 45 EAST WEST DRIVE See print out 46 47 VERT DRIVE POS NEG See print out 48 49 IF INPUT See print out 50 EHT OVP 2 6 V 51 VERT SAWTOOTH See print out 52 REF CURRENT INPUT 3 9 V 53 AGC DECOUPLING 3 2 V 54 TUNER AGC OUTPUT 3 6 V 55 AUDIO DEAMPHASIS See print out 56 DECOUPLING SOUND See print out MODULATOR KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GR...

Страница 46: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 46 IC201 PIN 3 4 IC201 PIN 6 IC201 PIN 5 IC201 PIN 7 ...

Страница 47: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 47 IC201 PIN 8 IC201 PIN 11 IC201 PIN 10 IC201 PIN 13 ...

Страница 48: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 48 IC201 PIN 18 IC201 PIN 26 IC201 PIN 20 IC201 PIN 27 ...

Страница 49: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 49 IC201 PIN 28 IC201 PIN 38 IC201 PIN 34 IC201 PIN 48 49 ...

Страница 50: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 50 Troubleshooting No Color ...

Страница 51: ...l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 51 Horizontal Deflection Circuit ...

Страница 52: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 52 Horizontal Deflection Circuit Description 20 25 Horizontal Deflection Circuit Deflection current waveform ...

Страница 53: ...escription 27 Inch Horizontal Deflection Circuit KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 53 QE01 C E Resistance is controlled by DC current Parabola voltage in vertical deflection time from EastWest Amp output in IC301 ...

Страница 54: ...T52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 54 ACQUISITION MODE PEAK DETECT POINT C ACQUISITION MODE PEAK DETECT POINT A ACQUISITION MODE PEAK DETECT POINT E ACQUISITION MODE PEAK DETECT POINT B ...

Страница 55: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 55 ACQUISITION MODE PEAK DETECT POINT G ACQUISITION MODE PEAK DETECT POINT D ACQUISITION MODE PEAK DETECT POINT F ...

Страница 56: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 56 IC301 PIN 11 ACQUISITION MODE PEAK DETECT IC201 PIN 45 IC301 PIN 12 ...

Страница 57: ...is l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 57 ACQUISITION MODE PEAK DETECT IC201 PIN 42 ACQUISITION MODE PEAK DETECT IC201 PIN 40 ACQUISITION MODE PEAK DETECT IC201 PIN 43 ACQUISITION MODE PEAK DETECT IC201 PIN 41 ...

Страница 58: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 58 Vertical Deflection Circuit ...

Страница 59: ...he resistor R303 for TDA356 R307 R308 for TDA8350Q in series with the deflection coil and the voltage across this resistor is internally used for feedback information The input circuit is voltage driven and is adapted for circuits which deliver symmetrical signal currents The differential current across the external resistor R301 a voltage which determines the output current through the coil The r...

Страница 60: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 60 IC301 PIN 1 IC301 PIN 4 IC301 PIN 3 IC301 PIN 5 ...

Страница 61: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 61 IC301 PIN 8 IC301 PIN 10 IC301 PIN 9 ...

Страница 62: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 62 IC201 PIN 46 IC201 PIN 51 IC201 PIN 47 ...

Страница 63: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 63 IC201 PIN 47 VS 0 IC201 PIN 47 VS 63 IC201 PIN 47 VA 0 IC201 PIN 47 VA 63 ...

Страница 64: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 64 Troubleshooting No Vertical Scan Horizontal Line ...

Страница 65: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 65 Sound Circuit ...

Страница 66: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 66 IC Block Diagram Description MTS Module Terminal Description IC 601 TDA 7266 Description IC602 UPC 1853 Description ...

Страница 67: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 67 MTS MODULE PIN 7 IC602 PIN 13 14 MTS MODULE PIN 1 2 IC602 26 27 29 30 ...

Страница 68: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 68 IC601 PIN 1 2 IC601 PIN 12 IC601 PIN 4 5 IC601 PIN 14 15 ...

Страница 69: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 69 IC202 PIN 6 IC201 PIN 1 IC202 PIN 1 2 IC201 PIN 55 ...

Страница 70: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 70 Troubleshooting No Sound ...

Страница 71: ...l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 71 CRT Drive Circuit ...

Страница 72: ...ription Pin No Pin Name Description 1 Vip Non Inverting votage Input 3V 2 Vddl Supply voltage low 12V 3 Vln Inverting voltage input 4 GND Ground substrate 5 Iom Black current measurement output 6 Vddh Supply voltage high 200V 7 Vcn Cathode transient voltage output 8 Voc Cathode DC voltage output 9 Vfb Feedback voltage output Vin versus Voc ...

Страница 73: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 73 B OUT AKB IC501 PIN 3 IC501 PIN 5 ...

Страница 74: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 74 IC501 PIN 7 IC501 PIN 9 IC501 PIN 8 ...

Страница 75: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 75 Troubleshooting No Raster Sound OK ...

Страница 76: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 76 A V Switching Description ...

Страница 77: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 77 PIP Block Diagram ...

Страница 78: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 78 Schematic Diagram ...

Страница 79: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 79 PIP Principle Sync Timing Diagrams Fig 7 5 Sampling Format Fig 7 6 Timing Waveforms Fig 7 7 PIP Dipslay in Main Picture ...

Страница 80: ...is necessary to re program this data 2 After IC902 is replaced warm up the TV for 10sec onds Make the following adjustments AFTER setting up purity and convergence White Balance Sub Brightness Vertical Center Vertical Size Horizontal Size No use in 21 and 25 models 3 2 Factory SERVICE Mode 1 The set must be in Factory Service Mode Selection sequence STAND BY MUTE 1 8 2 POWER ON 2 The FACTORY MODE ...

Страница 81: ...KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 81 3 2 1 Adjustment 1 Selection sequence STANDBY MUTE 1 8 2 POWER ON 2 Example Sub bright Adjustment see to the right ...

Страница 82: ...itude VA 0 63 22 Horizontal Shift HS 0 63 38 East West Amplitude EWA 0 63 53 East West Pin EWP 0 63 42 East West Corner EWC 0 63 31 East West Tilt EWT 0 63 31 Vertical Zoom VZM 0 63 not used 25 Matrix MAT on off off VOL 0 63 46 NOTE The actual data values vary according to model 3 2 2 Test pattern Aging Mode 1 This mode can be used during servicing or for confirm ing that the convergence and purit...

Страница 83: ...UNG GROUP O O TOC 83 3 2 3 Set Option Byte 1 In the Service Mode various options can be selected VIA the Option Bytes 2 Example BYTE 0 00 BYTE 1 00 FOR PIP MODEL BYTE 0 20 BYTE 1 00 FOR NON PIP MODEL Values Expressed in Hexadecimal Numbers ...

Страница 84: ... User Control data is available at MENU picture sound and the other functions etc Note When Factory Reset is selected the Factory Mode Data does not change Selection sequence Stand By MUTE 1 8 2 POWER ON FACTORY MODE Press CHz FACTORY MODE Press VOL Execute Adjustment Test Pattern Set Option Byte Factory Reset Adjustment Test Pattern Set Option Byte Factory Reset ...

Страница 85: ...stments 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 backco...

Страница 86: ...oil 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 3 3 3 High Voltage Check CAUTION There is no high voltage adjustment on this chas sis The B power supply must be set to either 130V or 125V for 20 screen Conditions Full color bar input and normal picture l...

Страница 87: ... B When Set Power ON button is pressed I C Operated 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 after servic ing Turn the power switch on and adjust the screen for Normal 3 Temporarily short Pin R and Pin X an the chassis RX05 RX04 Sound and picture will disappear 4 The TV should remain in this state This shows ...

Страница 88: ... 5 Loosen the Deflection Yoke clamp screw and move the Deflection Yoke as close to the purity magnet as possible 6 Loosen the Purity Magnet clamp Adjust the purity magnet so that the vertical green raster is precisely at the center of the screen Then tighten the clamp 7 Slowly move the Deflection Yoke forward and adjust it for the best overall green screen 8 Tighten the Deflection Yoke clamp screw...

Страница 89: ...Fig 3 2 Purity and Convergence Magnets KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 89 ...

Страница 90: ...nd superimpose red and blue vertical lines in the of the picture screen 4 Next turn both tabs at the same time Keep the angle between the tabs constant and superimpose the red and blue hori zontal lines at 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 horizontal lines 6 Repeat adjustments 3 4 and 5 T...

Страница 91: ...M5418 4 Set AGC in the Factory Mode so that the DC level of IC TDA8377 Pin 33 is 3 2 0 05 V 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 EWA VA EWP VSL EWC HS EWT KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 91 ...

Страница 92: ...veform of the 21st line and X 2 0 0 5 V 3 3 11 B HIGH LIGHT ADJUSTMENT 1 Input a TOSHIBA pattern 2 Set high light to 28F L 275 295 X Y with a color analyzer 3 Set low light to 1 0F L and set GG to step 32 SIZE 20 25 27 HIGH LIGHT 32F L 30F L 28F L 3 3 11 C SUB CONTRAST ADJUSTMENT 1 Set SCT so that the brightness level in highlight is 28 F L In case of 27V 3 3 11 D SUB BRIGHTNESS ADJUSTMENT 1 Input...

Страница 93: ...o that the top margin is 4 0 Adjust VSL so that the bottom mm gin is 4 0 If the top and bottom margins are different adjust VA so that their sum is 8 0 3 3 11 G HORIZONTAL SHIFT ADJUSTMENT 1 Input a lion head pattern 2 Adjust HS in the Service Mode so that the left and right margins of the lion head pattern are 5 0 0 5 KCT52A Chassis l SAMSUNG GROUP l SAMSUNG GROUP O O TOC 93 ...

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