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Autofocus; Zoom/Focus Tracking Adjustment; Af Noise Level Adjustment - Hitachi VK-S454 Service Manual

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5.4 Autofocus

Before starting adjustment:
1) Input D to PC on the main menu screen to display the AF menu screen.
2) Input the appropriate adjustment number to PC. (*1)
*1: Pressing the [Esc] key on the AF menu screen will restore the main menu screen.

(1) Zoom/Focus Tracking Adjustment

Incompleted Phenomenon:
Focus is lost during zooming.
Condition:
Point at the backfocus chart, 1500 ± 5mm away from the lens surface.
Light the backfocus chart with 200 - 400 lx.
Caution when Adjustment:
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) The zoom trace adjustment procedure is completed within 2 minutes after it is selected.
5) Do not place any obstruction between the lens and chart during adjustment.
Procedure:
1) Input 1 to PC on the AF menu screen.
2) Follow the instructions on PC display thereafter.

(2) AF Noise Level Adjustment

Incompleted Phenomenon:
It takes time until a subject is brought into focus.
Correct focus is not obtained.
Condition:
Point at a light box without a chart inserted at a distance of up to 10cm.
Caution when Adjustment:
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.
PC Display & Figs
Main menu
***********************************************************
MANUAL ADJUSTMENT PROGRAM
***********************************************************
[A]
DATA INITIALIZE
[B]
ELECTRIC VOLUME
[C]
ADJUSTMENT
[D]
AUTO FOCUS
[E]
SPOT NOISE
[F]
IR CONTROL
[ESC] END
Please select [A] - [F] or [ESC]
AF menu
***********************************************************
AUTO FOCUS ADJUSTMENT
***********************************************************
[1]
ADJUSTMENT OF ZOOM/FOCUS TRACKING
[2]
ADJUSTMENT OF AF NOISE LEVEL
[3]
CHECK OF ZOOM TRACE
[ESC] RETURN TO MENU
Please select [1] - [3] or [ESC]
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