Horizontal Output Circuit, Fbt, SW1 SW2 | Toshiba TW40F80 specs

4. HORIZONTAL OUTPUT CIRCUIT		10		HV
The horizontal output circuit applies a 15.625 kHz/15.734		5
kHz sawtooth wave current to the deflection coil with mu-		2	T461
kHz sawtooth wave current to the deflection coil with mu-		2	FBT
tual action of the horizontal output transistor and the damper			FBT
				S-charactor
diode, and deflects the electron beam from left to right in		3		capacitor
horizontal direction.	Q404
	Q404	1	8	Deflection yoke
	H output	1	8	Deflection yoke
(With damper diode)				(H coil)

IC501				T401				L462	L463	L464
IC501				H drive	C440	C343


			R415	transformer		D444
			R415		C444
H. out					C444		C418
H. out
		TP-33
		TP-33
		Q402		D461		C423		R441
		H drive		D461				R441


		BB81		C463						H
Q1	23	83								H
									linearity
									linearity
		R411		C417	C467					coil
		R410			C467
		R410
						D443		L441
						D443
			C413			L461
			C413
							To High Voltage
				+			Regulator Circuit
			C416	R416	C464
				R416	+
				Resonat	+
				capacitor
				To DPC output

SIGNAL	DEF/POWER PCB	125V
		125V

Diode modulator circuit

Fig. 9-4

4-1. Theory of Operation

4-1-1. Operation of Basic Circuit

(a)H output basic circuit

(1)	To perform the horizontal scanning, a 15.625 kHz/
	15.735 kHz sawtooth wave current must be flown into
	the horizontal deflection coil. Theoretically speaking,
	this operation can be made with the circuit shown in
	Fig. 9-5 (a) and (b).
(2)	As the switching operation of the circuit can be re-
	placed with switching operation of a transistor and a
	diode, the basic circuit of the horizontal output can be

Houtput transistor

	D	Co
	Damper	Resonant
	diode	Resonant
	diode	capacitor
		capacitor
		Vcc

L

Deflection yoke

expressed by the circuit shown in Fig. 9-5 (a). That is,

the transistor can be turned on or off by applying a

pulse across the base emitter. A forward switching cur-

rent flows for on-period, and a reverse switching cur-

rent flows through the diode for off-period. This switch-

ing is automatically carried out. The diode used for

this purpose is called a damper diode.

(b)H output equivalent circuit

SW1	SW2	Co	L
		Vcc
	Fig. 9-5

68

Image 68

Toshiba TW40F80 manual Horizontal Output Circuit, Operation of Basic Circuit, Fbt, Signal DEF/POWER PCB, SW1 SW2

Contents

TW40F80 Contents Terminal FUNCTION, Description and Block Diagram Wide Aspect Conversion Circuit Failure Analysis Section X Deflection Distortion Correction Circuit Section XI Digital Convergence Circuit Section Feature Improved ServiceabilityOutline Merits of BUS System Reduction of Parts Count Specifications Chassis Model Front View Video 3 Inputs Rear View IN-VIDEO Remote Control View 100 Chassis Layout Starsight Newosd FRO. Surr Construction of Chassis Major Features Section II TUNER, IF/MTS/S. PRO Module Circuit BlockOutline RF AGC Audio Multiplex Demodulation Circuit A.PRO block diagram A.PRO Section Audio Processor Configuration of the audio circuit and signal flow are given POP Tuner Terminal No Name Operation of Channel Selection Circuit Microcomputer SDA SCL Microcomputer Terminal Function Microcomputer Terminal Name and Operation Logic Terminal Name Function In/Out Logic Remarks SDA On Screen FunctionEEPROMQA02 System Block Diagram Local KEY Detection Method Local key assignment Function To TV set Remote Control Code AssignmentCode Function Custom codes are 40-BFH TV set for North U.S.A Code Function Optional Setting for Each Model OPT0 OPT1 Models HEX Service Adjustment Entering to Service ModeTest Signal Selection Executing Self Diagnosis Function Failure Diagnosis ProcedureContents to be Confirmed by Customer Understanding Self Diagnosis Indication Self Check Clearing method of self diagnosis result YES Troubleshooting ChartTV does Not Turned on No Acception of KEY-IN No Picture Snow Noise Memory Circuit Check No Indication On Screen Section IV DVD Switch Circuit DVD Switch Block Diagram Outline Configuration Section V WAC Circuit OutlineCircuit Operation Operation Wide aspect conversion unit block diagram PB6348 Pin Function Pin function of TC9097F QFP 80 pin Names and functions of TC9097F Name Function VFL2 Block Diagram TC9097F system block diagram Wide Aspect Conversion Circuit Failure Analysis Procedures E2PROM OK? Adjustment Method Raster Horizontal One Screen multi-search process Section VI Dual Circuit OutlinePrinciples of Operation System Component Diagram of Dual Unit Video/Color/Deflection Process Section OSD Sub Screen Process Section Sub screen process section Main/Sub Screen Superimposing Section Main/Sub screen superimposing section Main IC Terminal FUNCTION, Description and Block Diagram DiagramQY01 MPC1832GT QY01 mPC1832GT pin layout QY03 TC9092AF internal block diagram QY03 TC9092AF pin layout QY03 TC9092AF pin list No Pin name Pin function CKW MRD1 QY10/QY11 M518221-30ZS internal block diagram Circuit Description Section VII 3-DIMENSION Y/C Separator Circuit OutlineConfiguration Circuit Description Terminal description PZ01 Section Viii Vertical Output Circuit Outline Theory of Operation Output Circuit Actual CircuitSawtooth Waveform Generation Circuit Operation Output Output stage power supply voltage Linearity Characteristic Correction Protection Circuit for V Deflection StopCharacter Correction Up-and Down-ward Extension Correction Up-and Down-ward Linearity Balance +35V Over Current Protection Circuit Theory of OperationUZ22BSD UZ11BSB Raster Position Switching Circuit Ketsu Signal Section IX Horizontal Deflection Circuit OutlineHorizontal Drive Circuit Basic Operation of Horizontal Drive On period OFF period Signal DEF/POWER PCB Horizontal Output CircuitOperation of Basic Circuit FBT Description of the basic circuit T1~t2 T2~t3T3~t4 T4~t6 Curve Correction S Capacitor Amplitude CorrectionLinearity Correction LIN Left-right Asymmetrical Correction LIN coil Linearity coil White Peak Bending Correction Circuit OutlineOperation Theory EHT Blanking Low Voltage Protection Gate Protector High Voltage Generation Circuit AFCABL High Voltage DPC Circuit Regulator High Voltage 1. +210V2. +35V Anode High Voltage CircuitCR-BLOCK ED’ ActualFBT CR-BLOCK E H RAY Protection Circuit 23 X-RAY protection circuit Over Current Protection Circuit Functions and Features Block Diagram Diode Modulator Circuit OUT Actual Circuit First Half Scanning Period Basic Operation and Current PathLater Half Scanning Period P.T Later Half of Flyback PeriodFirst Half of Scanning Period Section XI Digital Convergence Circuit Outline Reset MemoryProm PLL Picture Adjustment Service Mode Entering/Exiting Mode Sfull Initial screenFirst screen Second screen Key function of remote control unit ENT Normal/Full Operation procedureEach Screen Adjustment Method Theater Wide1 Theater Wide 269.5 Case Study When CRT is ReplacedWhen Convergence Unit is Replaced Adjusting Procedure in Replacing Convergence Unit/Main Def TroubleshootingAdjusting Procedure in Replacing CRT Convergence Output Circuit Convergence Block Diagram Convergence Troubleshooting Chart Main Unit