Dell 21N21E2 service manual Static Convergence Rough Adjustment, Purity, Dynamic Convergence

Page 16

ELECTRICAL ADJUSTMENTS

3.PURITY AND CONVERGENCE ADJUSTMENTS

NOTE

1.Turn the unit on and let it warm up for at least 30 minutes before performing the following adjustments.

2.Place the CRT surface facing east or west to reduce the terrestrial magnetism.

3.Turn ON the unit and demagnetize with a Degauss Coil.

3-1: STATIC CONVERGENCE (ROUGH ADJUSTMENT)

1.Tighten the screw for the magnet. Refer to the adjusted CRT for the position. (Refer to Fig. 3-1)

If the deflection yoke and magnet are in one body, untighten the screw for the body.

2.Receive the green raster pattern from the color bar generator.

3.Slide the deflection yoke until it touches the funnel side of the CRT.

4.Adjust center of screen to green, with red and blue on the sides, using the pair of purity magnets.

5.Switch the color bar generator from the green raster pattern to the crosshatch pattern.

6.Combine red and blue of the 3 color crosshatch pattern on the center of the screen by adjusting the pair of

4 pole magnets.

7.Combine red/blue (magenta) and green by adjusting the pair of 6 pole magnets.

8.Adjust the crosshatch pattern to change to white by repeating steps 6 and 7.

3-2: PURITY

NOTE

Adjust after performing adjustments in section 3-1.

1.Receive the green raster pattern from color bar generator.

2.Adjust the pair of purity magnets to center the color on the screen.

Adjust the pair of purity magnets so the color at the ends are equally wide.

3.Move the deflection yoke backward (to neck side) slowly, and stop it at the position when the whole screen is green.

4.Confirm red and blue colors.

5.Adjust the slant of the deflection yoke while watching the screen, then tighten the fixing screw.

DEFLECTION YOKE

DEFLECTION YOKE SCREW

MAGNET SCREW

PURITY MAGNETS 6 POLE MAGNETS 4 POLE MAGNETS

Fig. 3-1

3-3: STATIC CONVERGENCE

NOTE

Adjust after performing adjustments in section 3-2.

1.Receive the crosshatch pattern from the color bar generator.

2.Combine red and blue of the 3 color crosshatch pattern on the center of the screen by adjusting the pair of

4 pole magnets.

3.Combine red/blue (magenta) and green by adjusting the pair of 6 pole magnets.

3-4: DYNAMIC CONVERGENCE

NOTE

Adjust after performing adjustments in section 3-3.

1.Adjust the differences around the screen by moving the deflection yoke upward/downward and right/left.

(Refer to Fig. 3-2-a)

2.Insert three wedges between the deflection yoke and CRT funnel to fix the deflection yoke.

(Refer to Fig. 3-2-b)

R G BR G B

R

G

B

R

G

B

UPWARD/DOWNWARD SLANT RIGHT/LEFT SLANT

Fig. 3-2-a

WEDGEWEDGE

WEDGE

WEDGE POSITION

Fig. 3-2-b

D-4

Image 16
Contents Colourtelevision Insulation Check Procedure HOW to Order PartsServicing Notices on Checking Contents General Specifications SystemA3-2 A3-3 A3-4 A3-5 Installation Disassembly InstructionsRemoval Removal and Installation of Flat Package IC B2-2 When Replacing Eeprom Memory IC Service Mode ListConfirmation of Hours Used Electrical Adjustments Constant VoltageVCO Coase L1, VCO Fine L1 AGC VoltageWhite Balance Horizontal PositionVertical Size Vertical POSITION/VERTICAL LinearityContrast Cent NO. FunctionStatic Convergence Rough Adjustment PurityStatic Convergence Dynamic ConvergenceCRT PCB Main PCBBlock Diagram Printed Circuit Boards MAIN/CRT Inserted Parts Printed Circuit Boards MAIN/CRT Chip Mounted Parts BshortSZP AB6U8O MszpV7ED7Y OB6DNXW SZP7XC7C OC8AXC6B SZP SZP XC6COT7 OT8C4A OC9B ZO CE4B 4CBDQ8C TQM SZPYTQ PA6BOA7C OA8AWaveforms 21PIN/AV SW Sound AMP Mechanical Exploded View CRT PCB AssyMechanical Replacement Parts List Electrical Replacement Parts List TSB P/N ResistorsJ2-2 Capacitors CS0RF04L5ZJ2-4 Diodes Switches ICSTransistors Coils &TRANSFORMERSBoard Assemblies Variable ResistorsMiscellaneous