JAA79051-R.3624.A
- L34 ･ AF-S DX18-70/3.5-4.5G -
LENS OPERATION CHECK
Check the lens operation by using a personal computer after assembling.
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Check by using PC
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Inspections
１．
Operation of MR encoder
・
Drive the lenses for scanning and check the difference in pulses between start and end.
・
In case the MR encoder’s MR head is not properly attached on the magnetic tape, the difference in pulses is
larger.
２．
Lens servo stop accuracy
・
Check the overrun/underrun pulses (misalignment of the stop position against the aimed position) for the
specified lens actuation.
・
If there is no mechanical irregular operations of the focus ring drive unit, underrun tends to occur when the cam
ring rotary weight of the MR encoder is heavy, while overrun tends to occur when it is light.
３．
Lens servo time
・
Check the servo time (time from servo start to stop) with an oscilloscope when the specified lens is actuated.
・
If there is no mechanical irregular operations of the focus ring drive unit, the servo time tends to be long when
the
cam ring rotary weight of the MR encoder is heavy, while the time tends to be short when it is light.
４．
Switches and lenses
・
Check the ON/OFF operation of switches and the operation of the distance encoder and zoom encoder.
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After the inspections
１．
When the MR encoder operation is out of standard:
Adjust the MR duty again. (Refer to P. L32.)
If the pulse is out of the standard, adjust the output pulse/waveform from the MR encoder again. (Refer
to P. L17.)
If the pulse meets the standard, replace the cam ring unit.
２．
When the lens servo stop accuracy is out of the standard:
Check the output pulse/waveform from the MR encoder. If it is normal, replace the cam ring unit.
３．
When the lens servo time is out of the standard:
Adjust the driving frequency and motor control again.
If the lens servo time is still out of the standard after the readjustment, replace the cam ring unit.
４．
When switches do not operate properly:
Check the wiring arrangements of the defective switch or replace it.
INC
