Purpose Of Adjustments And Incompleted Phenomenon - Hitachi DZ-GX20A Service Manual

Adjustment > List of Adjustment Items

6-3-3 Purpose of Adjustments and Incompleted Phenomenon

Item
Initial Data Write
Video Level
Burst Level
Autofocus
Auto Iris Control
Sampling Pulse
Linearity
Matrix
Chroma Gain
Spot Noise
LCD PLL
LCD Contrast-1
LCD Bright
LCD Contrast-2
LCD White Balance
Purpose
To write initial data to EEPROM in
which adjustment data has been stored
To set the video output level.
To set the burst level.
To set out-of-focus correction level
during zoom.
To set iris control data.
To measure the delay time in sampling
IC, and optimize pulse timing.
Adjustment item exclusively for DZ-
GX20A: Procedure is to match the
levels of two-system CCD image sensor
outputs.
To compensate for unevenness in the
chroma signal and input auto white
balance control data.
To set color saturation for the
reference color temperature.
To correct spot noise.
To synchronize LCD image.
To set the bright level and contrast of
the LCD monitor.
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Incompleted Phenomenon
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The picture becomes dark or whitish.
Focus is lost during zooming.
It takes time until a subject is brought into
focus, or correct focus is not obtained.
The picture becomes too bright or dark.
Diagonal beats and horizontal noise occur.
The brightness (luminance levels) differ on
the left and right of screen bounded at the
center.
Color reproduction becomes defective.
Color of the picture is denser or lighter
than that of the subject.
Spot noise occurs.
Synchronization of LCD image is distorted.
Color reproduction becomes defective of the
LCD monitor.