Nikon JAA79551, Repair Manual

Page: 58 / 115

INC
JAA79551-R.3690.A
- A31 ･ AF-S VR 70-300/4.5-5.6G -
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
Standard
Ｈ：Ｌ＝
100
：
150
～
150
：
100
（
50
％
±10.0
％）
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 rewiting of EEPROM
DATA.] then [3.Writing the Fixed DATA.]
How to adjust
� �
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.
� �
Select "1. Adjustment for MR duty" in the menu of the AF-S VR70-300 inspection program.
�
�
The confirmation screen for writing the fixed values in EEPROM appears. Select the appropriate item.
�
�
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.
● Setting of oscilloscope
V/Div
（
CH1
） ：
5V
V/Div
（
CH2
） ：
5V
Coupling
：
DC
Time/Div
：
5 m Sec
Trigger Mode
：
NORMAL
Trigger Coupling
：
DC
Trigger Source
：
CH
１
Trigger Position
：
- 4 div
Trigger Type
：
EDGE
Trigger Level
：
2.5 V
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 duty of each waveform (from infinity to close or close to infinity position) is NOT 50%,
select "Yes" by following the instructions of the software. Then repeat until it becomes 50%.
However, if it does not fall within the standard after several repetitions, re-check on "Inspection
and adjustment of output waveform of MR encoder" on Page 12.