Nikon AF-S VR Zoom-Nikkor ED 70-200mm f/2.8G IF Repair Manual page 26

④ In the case of smaller amplitude, for adjustment, loosen
the two screws #96 and then shift the MR head position
as shown in the right figure.
Note：During adjustment, prevent the magnetic tape and MR
head from touching the magnetized driver bit, or the magnetic
data may be damaged.
《Reference》
● In case the amplitude of either CH1 or CH2 seems smaller, one of the two screws #96 may be loosened.
Then, check the screws. In case the screws are fully tightened, the MR head may be troubled. Then, be sure to
replace the MR head unit B88 and adjust it again.
● In case there is a drop partially in the amplitude of vibration between the infinity and the closest, replace the magnetic
tape (attached to B61) and readjust it because the data on magnetic tape may be damaged.
⑤ Turn the power supply OFF.
C H 1 = 2 0 m V C H 2 = 2 0 m V
A C 1 0 : 1 A C 1 0 : 1
C H 1 = 2 0 m V C H 2 = 2 0 m V
A C 1 0 : 1 A C 1 0 : 1
- L23 ･ AF-S VR 70-200/2.8G -
INC
JAA78151-R.3584.A
MR head
Magnetic tape
＃ 96 × 2
Screw lock
5 m s / d i v
NORM 200KS/s
5 m s / d i v
NORM 200KS/s