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Af Noise Level Adjustment; Check Of Zoom/Focus Trace - Hitachi VK-S274R Service Manual

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Adjustment > Auto Focus

6-6-2 AF noise level adjustment

Incompleted Phenomenon
1) It takes time until a subject is brought into focus.
2) Correct focus is not obtained.
Condition
Point at a light box without a chart inserted at a distance of
up to 10cm.
Note:
1) Place the light box as parallel as possible to the lens
surface.
2) The AF noise level adjustment procedure will be
completed within thirty seconds after it is selected.
Procedure
1) Input 2 to PC on the AF menu screen.
2) Follow the instructions on PC display thereafter.

6-6-3 Check of zoom/focus trace

Incompleted Phenomenon
Focus is lost during zooming.
Condition
1) Point at the backfocus chart, 1500 ± 5mm away from the
lens surface.
2) Light the backfocus chart with 200 - 400 lx.
Note:
1) Measure the distance between the chart and lens surface
precisely.
2) Place the chart as parallel as possible to the lens surface.
3) The backfocus chart should always be at the center of the
monitor screen when the zoom is set to the wide-angle
and telephoto ends.
4) Do not place any obstruction between the lens and chart
during adjustment.
Procedure
1) Input 3 to PC on the AF menu screen.
2) Follow the instructions on PC display thereafter.
If error message appears, readjust the following items:
6-6-1 Zoom/focus tracking adjustment
6-6-2 AF noise level adjustment
AF menu
***********************************************************
***********************************************************
[1]
[2]
[3]
[ESC] RETURN TO MENU
Input 2.
AF menu
***********************************************************
***********************************************************
[1]
[2]
[3]
[ESC] RETURN TO MENU
Input 3.
6 - 12
AUTO FOCUS ADJUSTMENT
ADJUSTMENT OF ZOOM/FOCUS TRACKING
ADJUSTMENT OF AF NOISE LEVEL
CHECK OF ZOOM/FOCUS TRACE
Please select [1] - [3] or [ESC]
Follow the instructions on
PC display thereafter.
AUTO FOCUS ADJUSTMENT
ADJUSTMENT OF ZOOM/FOCUS TRACKING
ADJUSTMENT OF AF NOISE LEVEL
CHECK OF ZOOM/FOCUS TRACE
Please select [1] - [3] or [ESC]
Follow the instructions on
PC display thereafter.

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