Sony Trinitron KV-29F3A - SET-UP ADJUSTMENTS; Beam Landing Adjustment

KV-29F3
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 1, Beam landing
adjustments. 2. Convergence
Unless there are specific instructions to the contrary, 3. Focus
carry out these adjustments with the rated power 4. White balance
supply.
Unless there are specific instructions to the contrary, set
the controls and switches to these settings :
@ Contrast ..... 80% (or remote control
normal)
x Brightness 50%
Note: Testing equipment required.
1, Color bar/pattern generator
2. Degausser
3. DC power supply
4, Digital multimeter
5. Oscilloscope
Preparation:
.
In order to reduce the influence of geomagnetism on
the set's picture tube, face it east or west.
Switch on the set's power and degauss with the
degausser.
3-1. BEAM LANDING
1. Input the white signal with the pattern generator.
CONTRAST
BRIGHTNESS
Set the pattern generator raster signal to red.
Move the deflection yoke forward and adjust with the
purity control so that the red is at the centre and the
blue and the green take up equally sized areas on
each side. (See Fig. 3-1 - 3-3)
Move the deflection yoke 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 condition.
When the position of the deflection yoke has been
decided, fasten the deflection yoke with the screws.
If the beam does not land correctly in all the corners,
use a magnet to adjust it, (See Fig. 3-4)
normal
Fig. 3-2 Purity control
olen NV IC
l
Abuckle | \
| NECK ASSY
a | &2
nc
Deflection yoke
Disk magnets or
rotatable disk
magnets correct
these areas (a - d).
Purity control corrects
this area.
Deflection yoke positioning}
corrects these areas.