Manuals / Toshiba / TV and Video / Projection Television

Toshiba TW40F80 V Output Circuit, Actual Circuit, Sawtooth Waveform Generation, Circuit Operation

Models: TW40F80

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2. V OUTPUT CIRCUIT

2. V OUTPUT CIRCUIT

2-1. Actual Circuit

Q501

31

	C322				D309
	C322		+9V
			+9V
					R308		C308
					D308
15		3	+35V					D301	C313
15		3							C313
R329					7	6
					7	6
							3	R303
							3
14	Q302	6		4	Q301			L301	R336
14	Q302	6		4				L301	R336
C321							2		C307
					1	5			C307
					1	5		R307	L462+L463+L464
R320			R301					R307	L462+L463+L464
R320			R301
13		8						R306
			C314		C309		C311
			C314						C306
								R313	C306
								R313
			R330
								C305
		C319						R304	R305
				Fig. 8-3

2-2. Sawtooth Waveform Generation

2-2-1. Circuit Operation

The sawtooth waveform generation circuit consists of as shown in Fig. 8-4. When a trigger pulse enters pin 13, it is differentiated in the waveform shape circuit and only the falling part is detected by the trigger detection circuit, to the waveform generation circuit is not susceptible to variations of input pulse width.

The pulse generation circuit also works to fix the V ramp voltage at a reference voltage when the trigger pulse enters, so it can prevent the sawtooth wave start voltage from variations by horizontal components, thus improving interlacing characteristics.

		13	WAVEFORM	TRIGGER	PULSE	V. LAMP	AGC
	5Vp	13	SHAPE	DET.	GAIN	V. LAMP	AGC
			SHAPE	DET.	GAIN

	DC=0V
					14	15	16
				R329	C321	C322	C323
						+
						+9V
				Fig. 8-4

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Toshiba TW40F80 manual V Output Circuit, Actual Circuit, Sawtooth Waveform Generation, Circuit Operation

Contents

TW40F80 PROJECTION TELEVISIONTECHNICAL TRAINING MANUAL N5SS CHASSIS Contents 9. REMOTE CONTROL CODE ASSIGNMENTSECTION IV DVD SWITCH CIRCUIT SECTION II TUNER, IF/MTS/S. PRO MODULE5. TERMINAL FUNCTION, DESCRIPTION AND BLOCK DIAGRAM OF 4. WIDE ASPECT CONVERSION CIRCUIT FAILURE ANALYSIS3. SYSTEM COMPONENT DIAGRAM OF DUAL UNIT SECTION VII 3-DIMENSION Y/C SEPARATOR CIRCUITSECTION X DEFLECTION DISTORTION CORRECTION CIRCUIT 7. CONVERGENCE TROUBLESHOOTING CHART1. DEFLECTION DISTORTION CORRECTION IC TA8859CP SECTION XI DIGITAL CONVERGENCE CIRCUITSECTION 1. FEATURE OUTLINE 2. MERITS OF BUS SYSTEM2-1. Improved Serviceability 2-2. Reduction of Parts Count3. SPECIFICATIONS C-ChassisModel TW56F80 TW40F804. FRONT VIEW Note No Owners manual page5. REAR VIEW IN-VIDEO6. REMOTE CONTROL VIEW TOSHIBA7. CHASSIS LAYOUT 6 DUAL8. CONSTRUCTION OF CHASSIS A517BRT TBS SECTION II TUNER, IF/MTS/S. PRO MODULE 1. CIRCUIT BLOCK 1-2. Major FeaturesFig. 2-1 Block diagram 1-1. OutlineFig. 2-2 Block diagram of MVUS34S Switching1-3. Audio Multiplex Demodulation Circuit Table 2-1 Matrix for broadcasting conditions and reception modeFig. 2-3 A.PRO block diagram 1-4. A.PRO Section Audio ProcessorConfiguration of the audio circuit and signal flow are given in Fig MOTHERVIDEO FRONT INPUT2. POP TUNER 2-1. OutlineTerminal No NameSECTION III CHANNEL SELECTION CIRCUIT 1. OUTLINE OF CHANNEL SELECTION CIRCUIT SYSTEM2. OPERATION OF CHANNEL SELECTION CIRCUIT 3. MICROCOMPUTER 4. MICROCOMPUTER TERMINAL FUNCTION MICROCOMPUTER TERMINAL NAME AND OPERATION LOGIC Terminal NameFunction In/Out5. EEPROM QA02 6. ON SCREEN FUNCTION7. SYSTEM BLOCK DIAGRAM 8. LOCAL KEY DETECTION METHOD Fig. 3-6 Local key assignment Table 3-1 Local key assignmentFunction Function9. REMOTE CONTROL CODE ASSIGNMENT CodeFunction to TV setCustom codes are 40-BFH TV set for North U.S.A CodeFunction Custom codes are 40-BFH TV set for North U.S.A9-1. Optional Setting for Each Model OPT0OPT1 MODELS10. ENTERING TO SERVICE MODE 11. TEST SIGNAL SELECTION12. SERVICE ADJUSTMENT 13. FAILURE DIAGNOSIS PROCEDURE 13-1. Contents to be Confirmed by Customer13-3-1. Procedure Contents of self diagnosisContents 13-4. Understanding Self Diagnosis IndicationExample of screen display SELF CHECK13-4-2. Method utilizing inner signal 13-4-1. Clearing method of self diagnosis resultVIDEO INPUT 1 terminal should be open 14. TROUBLESHOOTING CHART 14-1. TV does Not Turned ONKey on TV Voltage change at pins 17, 18 of QA01 5V to OK Replace QA01 When remote unit key is pressed OK Replace QA01NG Check key-in circuit NG Check tuner power circuit No picture NG Voltage at pins of +5V, and OK14-4. Memory Circuit Check 14-5. No Indication On ScreenSECTION IV DVD SWITCH CIRCUIT 1. DVD SWITCH BLOCK DIAGRAM 2. OUTLINE Open at Cb input Cb to DVD SW unit Cb input RV28 100kRV27 10k QV01 TA1218NSECTION V WAC CIRCUIT 1. OUTLINE 2. CIRCUIT OPERATION2-1. Configuration 2-2-1. Signal FlowFig. 5-1 Wide aspect conversion unit block diagram PB6348 Pin Function Fig. 5-2 Pin function of TC9097F QFP 80 pinVDD5VCO2 Table 5-1 Names and functions of TC9097F NameFunction Name Function3. BLOCK DIAGRAM Fig. 5-3 TC9097F system block diagramName Function4. WIDE ASPECT CONVERSION CIRCUIT FAILURE ANALYSIS PROCEDURES 4-2-1. Adjustment Method 4-2. Raster Horizontal OneSECTION VI DUAL CIRCUIT 1. OUTLINE2. PRINCIPLES OF OPERATION 9-screen multi-search process3. SYSTEM COMPONENT DIAGRAM OF DUAL UNIT 4. CIRCUIT OPERATION 4-1. Video/Color/Deflection Process SectionSignalreception 4-2. Sub Screen Process Section Fig. 6-3 Sub screen process section4-3. Main/Sub Screen Superimposing Section Fig. 6-4 Main/Sub screen superimposing sectionMAIN IC 5. TERMINAL FUNCTION, DESCRIPTION AND BLOCK DIAGRAM OFdiagram QY01Power supply video Fig. 6-6 QY01 mPC1832GT pin layoutBlanking pulse output Fig. 6-7 QY03 TC9092AF internal block diagram MULTIPLEXPROGRAMDATA MEMORYFig. 6-8 QY03 TC9092AF pin layout ADVREFYTable 6-1 QY03 TC9092AF pin list No Pin namePin function Table 6-2 QY03 TC9092AF pin list No Pin namePin function Fig. 6-9 QY10/QY11 M518221-30ZS internal block diagram Power supply +5VFig. 6-10 QY10/QY11 M518221-30ZS pin layout Terminal nameSECTION VII 3-DIMENSION Y/C SEPARATOR CIRCUIT 2. CIRCUIT DESCRIPTION2-1. Configuration 1. OUTLINEFig. 7-1 3-dimension Y/C separator unit block diagram Signal nameTerminal description PZ01 VoltageSECTION VIII VERTICAL OUTPUT CIRCUIT 1. OUTLINE 1-1. Theory of Operation2. V OUTPUT CIRCUIT 2-1. Actual Circuit2-2. Sawtooth Waveform Generation 2-2-1. Circuit Operation2-3. V Output 2-3-1. Circuit OperationFig. 8-7 Output stage power supply voltage 3. PROTECTION CIRCUIT FOR V DEFLECTION STOP 2-4. V Linearity Characteristic Correction2-4-1. S-character Correction Up-and Down-ward Extension Correction 2-4-2. Up-and Down-ward Linearity Balance3-1. +35V Over Current Protection Circuit 3-1-1. Theory of Operation4. RASTER POSITION SWITCHING CIRCUIT 4-1. Outline4-2. Operation SECTION IX HORIZONTAL DEFLECTION CIRCUIT 2. HORIZONTAL DRIVE CIRCUIT3. BASIC OPERATION OF HORIZONTAL DRIVE Fig. 9-1 H drive circuit block diagram+ ib On periodOFF period current4. HORIZONTAL OUTPUT CIRCUIT 4-1. Theory of Operation4-1-1. Operation of Basic Circuit Description of the basic circuit 1. t1~t2 2. t23. t2~t3 4. t3~t4Amplitude Correction 4-1-2. Linearity Correction LIN1 S-curve Correction S Capacitor 2 Left-right Asymmetrical Correction LIN coil Fig. 9-9 Linearity coil4-2. White Peak Bending Correction Circuit 4-2-1. Outline4-2-2. Operation Theory Fig. 9-11 White peak bending correction circuit4-3. H Blanking 4-3-1. Outline4-3-2. Theory of Operation 4-3-3. Circuit Operation4-4. 200V Low Voltage Protection 4-4-1. Outline4-4-2. Theory of Operation 5. HIGH VOLTAGE GENERATION CIRCUIT 5-1. Theory of Operation5-1-1. +210V 5-1-2. +35V5-1-3 5-1-4. High Voltage6. HIGH VOLTAGE CIRCUIT 6-1. High Voltage Regulator6-1-1. Outline Fig. 9-19 Basic circuit for high voltage regulator6-1-3. Actual Fig. 9-22 Actual high voltage regulator circuit7. X-RAY PROTECTION CIRCUIT 7-1. Outline7-2. Operation Fig. 9-23 X-RAY protection circuit8. OVER CURRENT PROTECTION CIRCUIT 8-1. Outline8-2. Operation Fig. 9-24 Over current protection circuitSECTION X DEFLECTION DISTORTION CORRECTION CIRCUIT SIDE DPC CIRCUIT 1. DEFLECTION DISTORTION CORRECTION IC TA8859CP1-2. Functions and Features Block Diagram2. DIODE MODULATOR CIRCUIT 3. ACTUAL CIRCUIT 3-1. Basic Operation and Current Path 3-1-1. Later Half Scanning Period3-1-2. First Half Scanning Period 3-1-3. Later Half of Flyback Period 3-1-4. First Half of Scanning PeriodSECTION XI DIGITAL CONVERGENCE CIRCUIT 2-1. Configuration1. OUTLINE 2. CIRCUIT DESCRIPTIONFig. 11-1 Block diagram ∗∗∗812bit83. PICTURE ADJUSTMENT 3-2. Service Mode 3-2-1. Outline3-2-2. Entering/Exiting Mode 3-2-3. Initial screen 1 First screen2 Second screen 3-2-4. Key function of remote control unit TOSHIBA3-2-5. Operation procedure 3-3. Each Screen Adjustment Method3-3-1. Normal/Full 3-3-2. Theater Wide1 3-3-3. Theater Wide 3-3-4. Theater Wide 4. CASE STUDY 4-1. When CRT is Replaced4-2. When Convergence Unit is Replaced 5. TROUBLESHOOTING 5-1. Adjusting Procedure in Replacing CRT5-2. Adjusting Procedure in Replacing Convergence Unit/Main Def 6. CONVERGENCE OUTPUT CIRCUIT 6-2-1. Signal flow4 To adjust from outside of digital convergence 6-1. Outline6-3. Convergence Block Diagram 7. CONVERGENCE TROUBLESHOOTING CHART VerticalWIDE F BPVOLTAGEREG DV DH