Purity and Convergence „ Purity Adjustment | JVC AV-29V514/B

4.7.8 PURITY AND CONVERGENCE

PURITY ADJUSTMENT

	Note:
	The final adjustment of CONVERGENCE must be done after	WEDGE
	the FOCUS adjustment. (CONVERGENCE is changed by		DEFLECTION
			DEFLECTION
					YOKE
	FOCUS adjustment.)				YOKE


	When makes difference by FOCUS adjustment, should be			P
	reconfirming PURITY adjustment.			P
		CRT



	(1) Demagnetize CRT with the demagnetizer.	4 6



				P / C
	(2) Loosen the retainer screw of the deflection yoke.		MAGNETS
	(2) Loosen the retainer screw of the deflection yoke.
	(3) Remove the wedges.	• P/C MAGNETS
		• P/C MAGNETS

		P : PURITY MAGNET
	(4) Input a green raster signal from the signal generator, and	4 : 4 POLES (convergence magnets)
		6 : 6 POLES (convergence magnets)
	turn the screen to green raster.	6 : 6 POLES (convergence magnets)

		Fig.1
		Fig.1

(5)Move the deflection yoke backward.

(6)Bring the long lug of the purity magnets on the short lug and

position them horizontally. (Fig.2)

PURITY MAGNETS

Long lug

(7) Adjust the gap between two lugs so that the GREEN RASTER will come into the centre of the screen. (Fig.3)

(8) Move the deflection yoke forward, and fix the position of the	Short lug
deflection yoke so that the whole screen will become green.	Bring the long lug over the short lug
	and position them horizontally.
	Fig.2

(9)Insert the wedge to the top side of the deflection yoke so that it will not move.

(10)Input a crosshatch signal.

	(FRONT VIEW)	GREEN RASTER
		GREEN RASTER
(11)	Verify that the screen is horizontal.
(12)	Input red and blue raster signals, and make sure that purity
	is properly adjusted.
		CENTRE
		Fig.3

(No.YA139)1-29

Image 29

JVC AV-29V514/B service manual Purity and Convergence „ Purity Adjustment

Contents

AV-29V514/B Table of Contents Items Contents Specification Safety Precautions Section PrecautionLeakage Current Check Alternate Check Method Functions „ Remote Control Unit Section Specific Service InstructionsFeatures „ Rear Terminal VIDEO-1 Input Terminal „ Front Panel ControlsComponent VIDEO-2 Input Terminal Output Terminal Pin no Pin name Remark Main CPU Main PWB IC701 PIN Function Section Disassembly Main PWB Speaker FBT Procedure for Replacing Memory IC Replacement of Memory IC Setting item Setting content Setting value Factory Setting Value „ Setting of System Constant SET Power „ Setting of Basic FunctionsEdit / Manual Language Thai Tint How to install Chip parts Resistors, capacitors, etc Replacement of Chip ComponentSoldering Iron Transistors, diodes, variable resistors, etc Adjustment Preparation Section AdjustmentPresetting Before Adjustment Adjustment Items Front Control PWB ASS’Y 2/2 Adjustment Locations Service Menu Items Basic Operation in Service MenuBasic Operation in Service Menu HOW to Enter Service Menu Method of Setting Notes MHz Service Menu Flow Chart Focus Adjustment Adjustment ProcedureIf Circuit Adjustments Delay Point White Video Circuit AdjustmentsComposite White Balance Component White Balance Contrast SUB BrightSUB Secam Colour SUB ColourPAL Colour SUB Tint Audio Setting „ Compress OFF Deflection Circuit AdjustmentsSlope PAL V. Slope PAL V. Height HeightNtsc V. Height PAL H. Position PAL Side PIN Side PINNtsc Side PIN Trapezium PAL Corner PIN Corner PINNtsc Corner PIN Parallel Select Picture Features Ntsc Trapezium PIN PAL Trapezium PIN Preset VSM Preset Setting„ Video 2 SET Component VSM Purity and Convergence „ Purity Adjustment „ Dynamic Convergence Adjustment „ Static Convergence Adjustment Indication by the Power LED Section TroubleshootingSelf Check Functions Outline Self Check Items 32 No.YA139 WPC