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Set-up Adjustments; Beam Landing Adjustment; Beam Landing - Sony RM-785 Service Manual

Trinitron color video monitor.
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SECTION 3
SET-UP ADJUSTMENTS
The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.
These adjustments should be performed with rated power supply
voltage unless otherwise noted.
Controls and switches should be set as follows unless otherwise
noted:
PICTURE button ....................
Standard
BRIGHTNESS control·············
Standard
3-1.
BEAM
LANDING
ADJUSTMENT
Preparation:
l
.
Direct the unit to the East or West to escape the influence of
earthy magnetism
.
2.
Tum on the power and demagnetize with degausser.
3-1-1.
Beam
Landing
l
.
Receive an all white signal and set PICTURE button to
maximum.
2.
Position the neck assembly as shown in the figure.
(Fig. 3-1.)
3.
Adjust roughly the focus and horizontal convergence.
4.
Loosen the deflection yoke bracket, and set purity control to
the center. (Fig. 3-2.)
5.
Set the pattern generator to all red signal.
6.
Move the deflection yoke backward. Tum the purity
magnets evenly so that red is in the center. (Fig. 3-3.)
7.
Move the deflection yoke forward so that the entire screen
becomes
red.
(In the same way of procedures,
5
through
7,
adjust blue and green.)
8.
When comer landing is not adjusted correctly, fine-adjust
with magnets. (Fig. 3-4.)
9.
When the deflection yoke position is adjusted correctly,
tighten it with a bracket.
Perform the adjustments in order as follows:
3-1. Beam Landing Adjustment
3-2. Convergence Adjustment
3-3.
Focus Adjustment
3-4. G2, White Balance Adjustment
Note: Test Equipment Required.
l. Color bar pattern generator
2. Degausser
Fig. 3-1.
GAN
RED
Fig.
3-2.
Purity control range
Fig.
3-3.
-
31
-
PVM-3230
RM-785
Magnet

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