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Spot Noise - Hitachi VK-S274R Service Manual

Color & b/w video camera
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Adjustment > Spot Noise

6-7 Spot Noise

Spot noise refers to bright points that appear on the screen,
which are caused by a defect in pixel of image sensor.
Note:
1) Perform this adjustment after specified components have
been replaced (see "6-2-1 List of Adjustments Needed
After Replacing Major ").
2) Perform this adjustment if spot noise occurs under
abnormal usage conditions or after long-term use.
3) Perform this adjustment after completing all other
adjustments. Perform this adjustment in normal video
status.
Incompleted Phenomenon
Spot noise occurs under abnormal usage conditions or after
long-term use.
Equipment/Jig
Color video monitor (CRT type is desirable)
Condition
Cap the lens (so that no light enters).
Procedure
1) Input E to PC on the main menu screen.
2) Follow the instructions on PC display thereafter.
3) The screen for verifying writing of spot noise data will
appear: Input Y. Entering N on the screen for verifying
writing of spot noise data will restore the main menu
screen.
4) When writing data is complete, the spot noise data write
complete screen will appear: Press any key to restore the
main menu screen.
Note:
If spot noise still occurs after this adjustment is complete,
the image sensor may be defective.
Main menu
***********************************************************
***********************************************************
Input E.
Screen for verifying writing of spot noise data
Input Y.
Spot noise data write complete
Press any key.
6 - 13
MANUAL ADJUSTMENT PROGRAM
[A]
DATA INITIALIZE
[B]
ELECTRIC VOLUME
[C]
ADJUSTMENT
[D]
AUTO FOCUS
[E]
SPOT NOISE
[ESC] END
Please select [A] - [E] or [ESC]
Follow the instructions on
PC display thereafter.
<< DATA WRITING >>
START TO SEND DATA. (Y/N)
FINISHED WRITING DATA
PRESS ANY KEY
Adjustment menu

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