Reference - Nikon ED 17-55mm f/2.8G IF Repair Manual

④ In the case of smaller amplitude, loosen 2 screws (#123)
to move the MR head for adjustments as shown in Fig.1.
Note: During adjustment, prevent the magnetic tape and
MR head from touching the magnetized driver bit.
Otherwise, the magnetic data may be damaged.
《Reference》
● In case the amplitude of either CH1 or CH2 is smaller, one of 2 screws (#123) may be loosened,
so check for it. But if this is not the case, the MR head is regarded as malfunctioning. Be sure to
replace the MR head unit and adjust it again.
C H 1 = 2 0 m V
CH1
CH2
●In case there is a partial drop in the amplitude between the infinity and the near distance, the magnetic
data of magnetic tape may be damaged. Then, replace the magnetic tape and adjust it again.
C H 1 = 2 0 m V
CH1
CH2
⑤ Turn off the rated voltage power supply.
C H 2 = 2 0 m V
A C 1 0 : 1 A C 1 0 : 1
Fig.2
C H 2 = 2 0 m V
A C 1 0 : 1 A C 1 0 : 1
Fig.3
- L22・AF-S DX17-55/2.8G -
Magnetic tape
#123×2
Fig.1
5 m s / d i v
NORM 200KS/s
5 m s / d i v
NORM 200KS/s
INC
JAA78851-R.3617.A
MR Head