Sony FD TRINITRON KV-21FX30B Service Manual page 17

Geometry Adjustment.
Preparation:
Before starting this adjustment, adjust the horizontal and
vertical static convergence.
1. Remove the deflection yoke spacer.
2. Tilt the deflection yoke as indicated in the figure below and
optimise the geometry.
Tilting the DY Up and Down will balance the upper and
lower pin adjustment.
Tilting the DY Left and Right will balance the H-Trap
adjustment.
3. Re-install the deflection yoke spacer.
HTIL Adjustment
Deflection Yoke
HTIL correction can be performed by adding a TLH correction
assembly to the Deflection yoke.
Tilt Direction
TLH pieces
YCH Adjustment
YCH VR
+ +
Deflection Yoke
TLV Adjustment
TLV VR
+ +
Deflection Yoke
Screen Corner Convergence
If you are unable to adjust the corner convergence properly,
this can be corrected with the use of permalloy magnets.
a
a-d: screen-corner
convergence defect
c
Install the permalloy assembly
for the area that needs correcting.
b
Permalloy Assy
X-4387-214-1
d
Convergence adjustment with permalloy
17
b
d
a
c