Focus; Screen (G2) - Sony TRINITRON KV-20FS12 Service Manual

B G R
R
G
B R G B
R G B B G R
R G B
B
G
R
B
4. Tighten the deflection yoke screw.
5. Install the deflection yoke spacers.
TLH Plate Adjustment
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 deflection yoke.
B R R B
(R)(B) (B)(R)
4. Adjust XCV core to balance X axis.
5. Adjust YCH VR to balance Y axis.
B
G
R
B G R R G B
R
G
B
G
R
TLH+
TLH-
KV-20FS12/20FV12/21FE12/A/C/21FM12/21FV12/C
6. Adjust vertical red and blue convergence with V.TILT
(TLV VR).
Perform adjustments while tracking items 1 and 2.
Screen-Corner Convergence
1. Affix a permalloy assembly corresponding to the
misconverged areas.
b
d

3-3. FOCUS

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

Screen (G2)

3-4. SCREEN (G2)
1. Input a dots pattern.
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.
Ground
4. Observe the screen and adjust SCREEN (G2) VR in FBT
to obtain the faintly visible background of dot signal.
— 17 —
a
a
a-d: screen-corner
misconvergence
c
c
170 VDC Pedestal
b
d