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JAA78271-R.3598.A
- L30 ・ AF-S VR24-120/3.5-5.6G -
INSPECTION OF LENS OPERATIONS
Check the lens operations by using a personal computer after assembling.
○Check by personal computer
● Check by the following considerations:
1. MR encoder operations
・
Drive the scanning of lens and check the difference in pulses at the start and end.
・
In case the MR head of the MR encoder is malpositioned on the magnetic tape, the difference in pulses gets
large.
2. Lens-servo stop accuracy
・
Check the number of overrun/underrun pulses (deviation of the stop position from the target position) per the
specified lens driving.
・
In case the irregularity of mechanical operations does not take place in the focus ring driving unit, the underrun
tends to occur if it is heavy in the cam ring rotation of the MR encoder, while the overrun tends to occur if it is
light in its rotation of the MR encoder.
3. Lens-servo time
・
Check the servo time (from starting and stopping the servo) when driving the specified lens by using the
oscilloscope.
・
In case the irregularity of mechanical operations does not take place in the focus ring driving unit, the servo-
time tends to be long if it is heavy in the cam ring rotation of the MR encoder, while the servo-time tends to be
short if it is light in its rotation of the MR encoder.
4. Switches and lenses
・
Check the ON/OFF operations of switches, the distance encoder and zoom encoder.
● After inspections
1. When the MR encoder operations are not up to the standard:
Readjust the MR duty. (ref. Page L28.)
In case the pulse is not up to the standard, adjust the output waveform of the MR encoder again. (ref. Page
L15.)
In case the pulse meets the standard, replace the cam ring unit.
2. When the lens-servo stop accuracy is not up to the standard:
Check the output waveform of the MR encoder. If it is normal, replace the cam ring unit.
3. When the lens-servo time is not up to the standard:
Readjust the driving frequency and motor control.
In case the lens-servo time is not up to the standard even after the readjustment, replace the cam ring unit.
4. When switches do not work properly:
Check the wiring state of the troubled switch or replace it.
INC
Содержание AF-S VR Zoom-Nikkor ED 24-120mm f/3.5-5.6G IF
Страница 8: ...JAA78271 R 3598 A L6 AF S VR24 120 3 5 5 6G 139 2 97 24 Zoom ring 89 3 89 3 DISTANCE SCALE RING INC ...
Страница 98: ...JAA78271 R 3598 A F1 AF S VR24 120 3 5 5 6G 外観図 Sketch drawings INC ...
Страница 99: ...JAA78271 R 3598 A F2 AF S VR24 120 3 5 5 6G 組立図 Structure of the Lens INC ...
Страница 100: ...JAA78271 R 3598 A F3 AF S VR24 120 3 5 5 6G INC ...