Sony FD Trinitron KV-21LT1E - Manual (Page 18)

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If you are unable to adjust the corner convergence properly, this
can be corrected with the use of permalloy magnets.
HTIL correction can be performed by adding a TLH correction
assembly to the Deflection yoke.
HTIL Adjustment
YCH Adjustment
TLV Adjustment
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.
+ YCH VR
Deflection Yoke
+
+
Deflection Yoke
+ TLV VR
Screen Corner Convergence
TLH pieces
Deflection Yoke
Tilt Direction
a-d: screen-corner
convergence defect
a b
c d
a
b
d
Permalloy Assy
X-4387-214-1
c
Install the permalloy assembly
for the area that needs correcting.
Convergence adjustment with permalloy