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

Page 29

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

 

 

 

 

YOKE

FOCUS adjustment.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

When makes difference by FOCUS adjustment, should be

 

 

P

reconfirming PURITY adjustment.

 

 

CRT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1) Demagnetize CRT with the demagnetizer.

4 6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P / C

(2) Loosen the retainer screw of the deflection yoke.

 

MAGNETS

 

 

 

 

 

 

 

(3) Remove the wedges.

• 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.

 

 

 

 

 

 

 

 

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

 

 

(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

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Contents AV-29V514/B Table of ContentsItems Contents SpecificationSafety Precautions Section PrecautionLeakage Current Check Alternate Check MethodFunctions „ Remote Control Unit Section Specific Service InstructionsFeatures „ Rear Terminal VIDEO-1 Input Terminal „ Front Panel ControlsComponent VIDEO-2 Input Terminal Output TerminalPin no Pin name Remark Main CPU Main PWB IC701 PIN FunctionSection Disassembly Main PWB Speaker FBT Procedure for Replacing Memory IC Replacement of Memory ICSetting item Setting content Setting value Factory Setting Value „ Setting of System Constant SETPower „ Setting of Basic FunctionsEdit / Manual Language Thai TintHow to install Chip parts Resistors, capacitors, etc Replacement of Chip ComponentSoldering Iron Transistors, diodes, variable resistors, etcAdjustment Preparation Section AdjustmentPresetting Before Adjustment Adjustment ItemsFront Control PWB ASS’Y 2/2 Adjustment LocationsService Menu Items Basic Operation in Service MenuBasic Operation in Service Menu HOW to Enter Service Menu Method of Setting NotesMHz Service Menu Flow ChartFocus Adjustment Adjustment ProcedureIf Circuit Adjustments Delay PointWhite Video Circuit AdjustmentsComposite White Balance Component White BalanceContrast SUB BrightSUB Secam Colour SUB ColourPAL Colour SUB Tint Audio Setting„ Compress OFF Deflection Circuit AdjustmentsSlope PAL V. SlopePAL V. Height HeightNtsc V. Height PAL H. PositionPAL Side PIN Side PINNtsc Side PIN TrapeziumPAL Corner PIN Corner PINNtsc Corner PIN ParallelSelect Picture Features Ntsc Trapezium PIN PAL Trapezium PINPreset VSM Preset Setting„ Video 2 SET Component VSMPurity and Convergence „ Purity Adjustment „ Dynamic Convergence Adjustment „ Static Convergence AdjustmentIndication by the Power LED Section TroubleshootingSelf Check Functions Outline Self Check Items32 No.YA139 WPC
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