Sony GDM-F520 Service Manual page 20

19. Check landing at each corner and in case not in specification, adjust
landing of 4 corners with "LCC_NS", "LCC_LT", "LCC_LB",
"LCC_RT", and "LCC_RB". The limitations of registers are shown
below.
LCC_NS: 128 ± 15
LCC_LT, LCC_LB, LCC_RT, and LCC_RB: 128 ± 40
20. Remove the sensor and wobbling coil.
21. Switch signals to R, G, and B, and then check that the pure colors have
good color purity.
22. Fix purity magnets with white paint.
GDM-F520(E) 3-3