Nikon AF-S Zoom-Nikkor ED70-200mm f/2.8G IF, Repair Manual, Page: 52 / 100

JAA78151-R.3584.A
- L48 ･ AF-S VR 70-200/2.8G -
C H 1 = 5 V C H 2 = 5 V 5 m s / d i v
D C 1 0 : 1 D C 1 0 : 1
NORM 200KS/s
Ｈ
Ｌ
ADJUSTMENT FOR MR DUTY
●
In case of replacing the main PCB, SWM unit or MR encoder unit, be sure to make this adjustment.
How to adjust
①
Make sure that the current and voltage of the connected rated voltage power supply are the set values.
Then, turn on the rated voltage power supply for the contacts A and F.
②
Select "1. MR DUTY ADJUSTMENT" in the menu items of the AF-S zoom lens (New) inspection program.
③
The display to check whether the fixed values are written in EEPROM or not appears. Select a proper item.
④
According to the instruction on the screen, rotate the MF ring from the infinity direction to the near distance
direction slowly by hand. Make sure that the waveform on the oscilloscope has duty 50% and then stop the MF
ring at the near distance end.
● Setting of oscilloscope
V/Div（CH1） ：５Ｖ
V/Div（CH2） ：５Ｖ
Coupling ：ＤＣ
Time/Div ：５m Sec
Trigger Mode ：NORMAL
Trigger Coupling ：ＤＣ
Trigger Source ：ＣＨ１
Trigger Position ：＋４div
Trigger Type ：EDGE
Trigger Level ：２． ５Ｖ
⑤
According to the instruction on the screen, rotate the MF ring from the near distance direction to the infinity
direction slowly by hand. Make sure that the waveform on the oscilloscope has duty 50% and then stop the
MF ring at the infinity end.
Note：
If the waveform from infinity to near distance and vice versa does not have duty 50%, perform again
"INSPECTION AND ADJUSTMENT FOR THE WAVEFORM OUTPUT FROM MR ENCODER" in P.L20.
Standard Ｈ：Ｌ＝ 100：206 ～ 206：100（50％± 17.3％）
INC