17. Convergence Adjustment

Purpose: To obtain proper convergence of red, green and blue beams.

Symptom of Misadjustment: If Convergence Adjust- ment is incorrect, the edge of white letters may have color edges.

Test Point

Adj. Point

Mode

Input

 

C.P. Magnet

 

Dot Pattern

 

(RB),

 

---

C.P. Magnet

---

or

 

(RB-G),

 

Crosshatch

 

Deflection Yoke

 

 

Tape

M. EQ.

Spec.

---

Pattern

See below.

Generator

 

 

 

 

Figures

 

 

 

CRT

 

 

 

COIL SCREW PURITY RB

RB-G

 

 

 

RING LOCK

 

 

 

SCREW

DY WEDGE

 

 

 

 

 

C.P. MAGNET CLAMPER

 

C.P. MAGNET

 

 

COIL CLAMPER

 

 

 

DEFLECTION YOKE

 

Fig. 6

 

 

 

 

C.P. MAGNET (RB)

 

 

 

R

 

R

 

 

 

 

G

 

G

 

B

 

B

 

C.B. MAGNET (RB-G)

Fig. 7

 

 

 

RB

 

 

 

 

RB

G

 

G

 

Fig. 8

 

 

 

1.Loosen the Ring Lock and align red with blue dots or Crosshatch at the center of the screen by rotat- ing (RB) C.P. Magnets. (See Fig. 7)

2.Align red / blue with green dots at the center of the screen by rotating (RB-G) C.P. Magnet. (See Fig. 8)

3.Paintlock the C.P. Magnets after adjustment.

4.Remove the DY Wedges and slightly tilt the De- flection Yoke horizontally and vertically to obtain the best overall convergence.

5.Fix the Deflection Yoke by carefully inserting the DY Wedges between CRT and Deflection Yoke.

5-7

L2401EA

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Emerson 6420FE service manual Convergence Adjustment, Figures

6420FE specifications

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