Sony Trinitron KV-20S90, Service Manual, Page: 12 / 94

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KV-20S90 / 21SE43C
2-2. CONVERGENGE
Before starting convergence adjustments:
1 Perform FOCUS, VLIN and VSIZE adjustments.
2. Set BRIGHTNESS control to minimum.
3. Feed in dot pattern.
VERTICAL STATIC CONVERGENCE
1. Adjust V. STAT magnet to converge red, green and blue dots in the
center of the screen (Vertical movement adjust V.STAT RV701 to
converge).
B
G
R
Center dot
R G B
V.STAT magnet
2. Tilt the V. STAT magnet and adjust static convergence to open or close
the V. STAT magnet.
When the V. STAT magnet is moved in the direction of arrow a and b,
red, green, and blue dots move as shown below:
B
R
G
B
R
G
R G B
B G R
1
2
b
b
b
b b
b
b
a
a
b
a
a
a
a
3
R
G
B
B
G
R
If the blue dot does not converge with the red and green dots, peform
the following:
1. Move BMC magnet (a) to correct insuffi cient H.Static convergence.
2. Rotate BMC magnet (b) to correct insuffi cient V.Static convergence.
3. In either case, repeat Beam Landing Adjustment.
BMC MA
GNET
PURITY
V.STAT
b
BMC magnet
a