Set-Up Adjustments; Beam Landing - Sony TRINITRON KV-25C5A Service Manual

KV-25C5/29C5
SECTION 3
SET-UP ADJUSTMENTS
When complete readjustment is necessary or a new
Carry out the following adjustments in this order :
picture tube is installed, carry out the following 3-1. Beam Landing
adjustments. 3-2. Convergence
. Unless there are specific instructions to the contrary, 3-4. Focus
carry out these adjustments with the rated power supply. 3-3. White balance
° Unless there are specific instructions to the contrary, set the
controls and switches to the following settings : Note: Test equipment required
1. Color bar/pattern generator.
Contrast kee 80% [or remote control normal] 2. Degausser.
3. Oscilloscope.
Brightness wee 50% 4. Digital multimeter.
5. DC Power supply.
Preparation: Fig. 3-2
For 29" models align the neck assy
1. In order to reduce the influence of geomagnetism on the set's _asindicated below. :
picture tube, face it in an easterly or westerly direction.
2: Switch on the TV set's power and degauss with the
3-1. BEAM LANDING
N
degausser.
Input an all-white signal from the pattern generator.
Set the Contrast and Brightness to normal.
Set the pattern generator raster signal to all Red.
Move the deflection yolk forward and adjust with the purity
control so that the Red is at the centre and the Blue and Green
take up equally sized areas on each side of the screen.
[See Fig.3-1 - 3-3].
Move the deflection yolk forward and adjust so that the entire
screen becomes Red. [See Fig.3-1].
Switch the raster signal to Blue, then to Green and verify the
purity condition.
When the position of the deflection yolk has been determined,
fasten the deflection yolk with the screws.
If the beam does not land correctly in all the corners, use
magnets to correct it. [See Fig.3-4].
Fig. 3-3
Fig. 3-1
16
a cts magnets correct
these areas (a- cl).
[|
A buckle
Neck Assy
Gl | Ge
Deflection Yoke
GREEN
RED
BLUE
Disk magnets or
rotatable disk