Adjustment Of Mr Duty; How To Adjust - Nikon AF-S VR Nikkor ED 300mm f/2.8G IF Repair Manual

Adjustment of MR duty

●In case of replacing the main PCB, SWM unit and MR encoder unit, be sure to make adjustments.
●In case of replacing the main PCB, be sure to perform [3.READING AND REWRITING OF EEPROM
DATA.] then [3.WRITING THE FIXED VALUES.]

How to adjust

① Make sure that the electric current and voltage of the connected rated voltage power supply are set to the
set values, which are instructed on the PC screen. Then, turn the rated voltage power supply ON.
② Select "1. MR DUTY ADJUSTMENT" in the menu of the AF-S VR300 inspection program.
③ The confirmation screen for writing the fixed values in EEPROM appears. Select the appropriate item.
④ Following the instruction on the screen, rotate the MF ring slowly by hand in the direction from the infinity
to the close distance position. Make sure that the waveform on the oscilloscope has duty 50% and stop the
MF ring at the close distance-end.
C H 1 = 5 V C H 2 = 5 V
D C 1 0 : 1
⑤ Following the instruction on the screen, rotate the MF ring slowly by hand in the direction from the close
distance to the infinity position. Make sure that the waveform on the oscilloscope has duty 50% and stop
the MF ring at the infinity-end.
Note ：In case the waveform from infinity to close distance position or vice versa does not have duty 50%,
repeat "INSPECTION AND ADJUSTMENT OF THE MR ENCODER OUTPUT WAVEFORM" on
Page A5.
Sandard Ｈ：Ｌ＝ 100：150 ～ 150：100（50％ ±10.0％）
D C 1 0 : 1
- A39・AF-S VR300/2.8G -
● Setting of oscilloscope
5 m s / d i v
NORM 200KS/s
V/Div（CH1）
V/Div（CH2）
Coupling
Time/Div
Trigger Mode
Trigger Coupling
Trigger Source
Trigger Position
Trigger Type
Trigger Level
JAA33751-R.3646.A
：5V
：5V
：DC
：5 m Sec
：NORMAL
：DC
：CH １
：+4 div
：EDGE
：2.5 V
Ｈ
Ｌ