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Focus; Screen (g2) - Sony KV-21FS105 Service Manual

Trinitron color television.
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Dynamic Convergence Adjustment
Before performing this adjustment, perform Horizontal and Vertical Static
Convergence Adjustments.
Preparation:
1. Slightly loosen defl ection yoke screw.
2. Remove defl ection yoke spacers.
3. Move the defl ection yoke for best convergence as shown:
R G B B G R
4 Tighten the defl ection yoke screw.
5. Install the defl ection yoke spacers.
TLH Plate Adjustment
Preparation:
1. Input crosshatch pattern.
2. Adjust PICTURE QUALITY to standard, PICTURE and BRIGHTNESS
to 50%, and OTHER to standard.
3. Adjust the Horizontal Convergence of red and blue dots by tilting the
TLH plate on the defl ection yoke.
R B
B R
(B)(R)
(R)(B)
4. Adjust XCV core to balance X axis.
5. Adjust YCH VR to balance Y axis.
KV-21FS105
B G R
R
B
G
G
B
R G B
R
B G R R G B
R G B
R
B
G
G
R
B
B
G
R
TLH+
TLH-
Screen-Corner Convergence
1. Affi x a permalloy assembly corresponding to the misconverged areas.
b
d

2-3. FOCUS

1. Adjust FOCUS control for best picture.
Focus (FV)

Screen (G2)

2-4. SCREEN (G2)
1. Input dot pattern from the pattern generator.
2. Set the PICTURE and BRIGHTNESS controls at minimum and
COLOR control at normal.
3. Adjust SBRT , GCUT, BCUT in service mode with an oscilloscope as
shown below so that voltages on the red, green, and blue cathodes
are 170 VDC.
170 + 4.0 Vdc
GND
4. Observe the screen and adjust SCREEN (G2) VR in FBT to obtain the
faintly visible background of dot signal.
KV-21FS105
a
a
b
a-d: screen-corner
misconvergence
c
d
c
170Vdc
pedestal
13

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