Sony SAL16105 Service Manual page 85

3. Earth Turn On Check
1) Remove the zoom rubber ring.
2) Check the conduction between the lens mount block and the ground brush.
Note:
Be sure to check the conduction entirely the zooming by turning from WIDE end to TELE end.
Fig.4-12-14
3) If no conduction, confirm whether the ground brush and the lens mount block are abnormal.
SAL16105 (DT 3.5-5.6/16-105) (DT 16-105mm F3.5-5.6)
Zoom Rubber Ring
Lens Mount Block
Check the conduction
Ground Brush
4-43