Magnavox 19MDTR20 - Dvd-video Player, Service Manual

Page: 195 / 399

1-7-9 T0102EA
The following 2 adjustments normally are not
attempted in the field. They should be done only
when replacing the CRT then adjust as a
preparation.
16. Purity Adjustment
Purpose: To obtain pure color.
Symptom of Misadjustment: If Color Purity
Adjustment is incorrect, large areas of color may not
be properly displayed.
* This becomes RED COLOR if the [7] button is
pressed while in service mode.
1. Set the unit facing east.
2. Operate the unit for over 30 minutes before
adjusting.
3. Fully degauss the unit using an external
degaussing coil.
4. Set the unit to the AUX mode which is located
before CH2 then input a red raster from video in.
5. Loosen the screw on the Deflection Yoke Clamper
and pull the Deflection Yoke back away from the
screen. (See Fig. 9.)
6. Loosen the Ring Lock and adjust the Purity
Magnets so that a red field is obtained at the
center of the screen. Tighten Ring Lock. (See Fig.
8, 9.)
7. Slowly push the Deflection Yoke toward the bell of
the CRT and set it where a uniform red field is
obtained.
8. Tighten the clamp screw on the Deflection Yoke.
17. Convergence Adjustment
Purpose: To obtain proper convergence of red, green
and blue beams.
Symptom of Misadjustment: If Convergence
Adjustment is incorrect, the edge of white letters may
have color edges.
1. Set the unit to the AUX mode which is located
before CH2 then input a dot or crosshatch pattern.
2. Loosen the Ring Lock and align red with blue dots
or crosshatch at the center of the screen by
rotating (RB) C.P. Magnets. (See Fig. 10.)
3. Align red / blue with green dots at the center of the
screen by rotating (RB-G) C.P. Magnet.
(See Fig. 11.)
4. Fix the C.P. Magnets by tightening the Ring Lock.
5. Remove the DY Wedges and slightly tilt the
Deflection Yoke horizontally and vertically to
obtain the best overall convergence.
6. Fix the Deflection Yoke by carefully inserting the
DY Wedges between CRT and Deflection Yoke.
Test Point Adj. Point Mode Input
---
Deflection Yoke
Purity Magnet
--- *Red Color
Tape M. EQ. Spec.
--- Pattern Generator See below
Figure
Fig. 8
GREEN RED BLUE
Test Point Adj. Point Mode Input
---
C.P. Magnet (RB)
C.P. Magnet (RB-G)
Deflection Yoke
---
Dot Pattern
or
Crosshatch
Tape M. EQ. Spec.
--- Pattern Generator See below
Figure
Fig. 9
Fig. 10
Fig. 11
DY WEDGE
DEFLECTION YOKE
C.P. MAGNET
RING LOCK
SCREW
SCREW
RB-G RB PURITY
CRT
COIL
COIL CLAMPER
C.P. MAGNET CLAMPER
B
G
R
R
G
B
C.P. MAGNET (RB)
RB
G
RB
G
C.B. MAGNET (RB-G)