JVC VN-H657U Instructions Manual page 11

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This camera will perform the initial operation of
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pan/tilt/zoom upon powering on. It takes about
90 seconds before the initial operation starts.
This is not a malfunction.
Do not subject the lens to strong light source
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such as sun rays. This may cause the equipment
to malfunction.
This camera comes with a built-in AGC circuit.
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The sensitivity increases automatically at a dark
place and the screen may appear grainy. This is
not a malfunction.
While AGC is activated, if a transceiver which
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causes strong electromagnetic wave is used
near the camera, the picture may suffer from
beat. Please use the camera more than three
meters away from such transceivers.
When this camera is used in the White Balance
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"ATW-Narrow" or "ATW-Wide" (automatic
adjustment) mode, the color tone may differ
slightly from the actual color due to the principle
of the automatic color temperature tracking
white balance circuit. This is not a malfunction.
If a high brightness object (such as a lamp) is
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shot, the image on the screen may have white
vertical tailings. This phenomenon (smear) is
characteristic of solid-state image sensors and
is not a malfunction.
Do not touch the dome cover with your hands.
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Dirty covers will cause image deterioration.
The dome cover may fog up due to the drastic
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change of temperature when humidity is high.
Noises from an external source may cause the
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camera to malfunction even when the alarm
signal cable used is within 50 m. In this case,
move the cable away from the noise source.
Depending on the stop position and rotation
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speed of the horizontal/vertical rotation
platform, the running sound of the rotation
platform's motor may be heard, but this is not a
malfunction.
The electronic shutter of this product is set to
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"1/30" by default. For regions with a commercial
power supply frequency of 50 Hz, switch to
"Flickerless" during use under fluorescent lights
(excluding inverter lighting equipment) to
prevent flickers.
The dark areas on the screen may appear grainy
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or white spots may increase. When switching
between color and black-and-white images, the
brighter area on the screen is emphasized,
which may reduce the visibility. However, this is
not a malfunction.
If the power supply voltage is momentarily cut
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off or reduced due to lightning or turning on of
the air conditioner's power, the image may be
disrupted or noise interference may occur.
As the dome cover is of a semiglobular shape,
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image distortion will occur at the hemispherical
edge. When the hemispherical edge of this unit
is masked and horizontal level is shot in a tilt
direction, the hemispherical edge will enter the
field angle. This may cause the upper edge of
the screen to become black and the focus
unclear. In this case, you can avoid shooting the
above area by using the Tilt Limit settings.
(A P44 [ Tilt Limit ] )
When shooting objects with a luminance
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difference or near a light source, ghost may
occur on the screen. This is a feature of the
dome cover and the built-in lens, and is not a
malfunction.
In particular, manual and auto pan operation
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near the TELE edge (telephoto side) may cause
the screen to vibrate (unsmooth rotation). This
is a feature of the motor and is not a malfunction.
As long magnification lens is used in this
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product, the focus may be unclear due to
temperature changes but this is not a
malfunction.
Preset the focus under an environment with a
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temperature closest to that in your actual usage.
If the temperature change is large and the focus
becomes unclear, preset the focus again before
using the product.
If you sense that the focus has become unclear
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due to temperature changes, use the Auto
Focus function or reset the focus manually.
The time of the internal clock may be
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significantly out of alignment if the power of the
product is turned off for a long time or when there
is prolonged power failure. If this occurs,
readjust the clock time.
(A P47 [[Time] Page] )
Replace the fan every five years.
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Before starting an important recording, be
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sure to perform a test recording in order to
confirm that a normal recording is possible.
We do not accept liability for the loss of a
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recording in the case of it becoming
impossible to record due to a problem in the
video camera, VTR, hard disk recorder or
video tape.
Precautions
11

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