Set-Up Adjustments; Beam Landing - Sony TRINITRON KV-27FV300 Service Manual

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.
The controls and switch should be set as follows unless otherwise
noted:
PICTURE CONTROL: normal
BRIGHTNESS CONTROL: normal

2-1. BEAM LANDING

Preparation:
• Input a white pattern signal.
• Face the picture tube in an East or West direction to reduce the
infl uence of geomagnetism.
NOTE: Do not use the hand degausser; it magnetizes the CRT .
1. Input white pattern from pattern generator.
2. Loosen the defl ection yoke mounting screw, and set the purity control
to the center as shown below:
Purity Control
3. Input green pattern from pattern generator.
4. Move the defl ection yoke backward, and adjust with the purity control
so that green is in the center and red and blue are even on both
sides.
SECTION 2: SET-UP ADJUSTMENTS
Blue Red
Green
Perform the adjustments in order as follows:
1. Beam Landing
2. Convergence
3. Focus
4. Screen (G2)/White Balance
Test Equipment Required:
1. Color Bar Pattern Generator
2. Degausser
3. DC Power Supply
4. Digital Multimeter
5. Oscilloscope
6. CRT Analyzer
5. Move the defl ection yoke forward, and adjust so that the entire screen
becomes green.
6. Switch over the raster signal to red and blue and confi rm the
condition.
7. When the position of the defl ection yoke is determined, tighten it with
the defl ection yoke mounting screw.
8. When landing at the corner is not right, adjust by using the disk
magnets.
Disk magnets
or rotatable disk
magnets correct
these areas (a-d)
b
d
— 12 —
KV-27FV300/29FV300/32FV300/36FV300
Purity control
corrects this area
a b
c d
Deflection yoke positioning
corrects these areas
a
c