Sony SAL1680Z Service Manual page 77

3) Hold the lower part of MF operation ring by hand and rotate it clockwise to tighten it to the lens unit.
4) When rotating the MF operation ring, confirm that the focus scale plate moves following the MF operation ring.
When rotating the coupler at the lens mount side with a screwdriver, confirm that the MF operation ring does not rotate.
If these two items are not met the specifications simultaneously, adjust the extent of tightening of MF operation ring to the lens unit
in step 3.
Screwdriver
SAL1680Z (Vario-Sonnar DT 3.5-4.5/16-80 ZA) (Vario-Sonnar T
Coupler
Fig.4-8-3
MF Operation Ring
Focus Scale Plate
DT 16-80mm F3.5-4.5 ZA)
*
4-31