Sony TRINITRON KV-A2121D - Page 15

SECTION 3
SET-UP ADJUSTMENTS
@ The following adjustments should be made when 1. Beam Landing
a complete realignment is required or a new 2. Convergence
picture tube is installed. 3. Focus
@ These adjustments should be performed with 4. Screen (G 2) and White Balance
rated power supply voltage unless otherwise noted. Note: Test Equipment Required.
The controls and switch below should be set as follows 1, Color bar/Pattern Generator
unless otherwise noted : 2. Degausser
Q CONTRASTcontrol--.-.--.- 80%(or Normal by 3. DC Power Supply
commander) 4. Digital multimeter
<t BRIGHTNESS control-.-.. 50% 5. Oscilloscope
Perform the adjustments in order as follows:
Preparation: (21 inch, 25 inch)
@ Set the side of the unit with the PICTUE TUBE so
that it faces east or west in order to reduce the
Purity control
influence of external magnetic force.
@ Turn the power switch for the unit ON and erase
the magnetic force using a degausser..
3-1. BEAM LANDING
Demagnetize with a degausser
1. Input a raster signal with the pattern generator.
CONTRAST
BRIGHTNESS } sah
2. Turn the raster signal of the pattern generator
to red.
3. Move the deflection yoke backward, and adjust
with the purity control so that red is in the center
and blue and green are at the sides evenly.
(Fig.3-1 - 3-3)
4. Move the deflection yoke forward, and adjust so Disk magnets or
that the entire screen becomes red. (Fig.3-1) eee eee aes
5. Switch over the raster signal to blue and blue and N WN these areas(a-d).
confirm the condition.
6. When the position of the deflection yoke is
determined,tighten it with a deflection yoke mount-
ing screw.
7. When landing at the corner is not right, adjust
by using the disk magnets. (Fig.3-4)
D)
as
Fig.3-1