JVC VN-H557U Instructions Manual page 8

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This camera will perform the initial operation of
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pan/tilt/zoom upon powering on.
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 noise may become noticeable on the
screen. 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", "ATW-Wide" or "ATW-Full"
(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.
Noises from an external source may cause the
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alarm to malfunction even when the alarm signal
cable used is within 50 m. In this case, move the
cable away from the noise source.
During audio input/output, noise may occur
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when the rotation mechanism is rotated
horizontally/vertically, when zooming is
performed, when the power is turned on/off, or
when the SD card is operating. This is not a
malfunction.
Noise may become pronounced in the audio
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when Mike Gain is set to a high value. This is not
a malfunction.
The pan operation range of this product is limited
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to ±175 °. Regardless of the function, operation
is not possible beyond this range.
In the event that the pan or tilt operation is
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performed forcibly by external force when power
is supplied, the camera will not return to the
original position. When this occurs, restart the
camera.
When using multicast, make use of an
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IGMPv2-compliant network switch.
Some switching hubs of products that are
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equipped with intelligent features may include a
broadcast/multicast suppression function.
Viewing of multicast images on this product may
fail if this function is enabled.
Precautions
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The video standard of this product is set to
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"NTSC" by default. If your region uses the PAL
format, you can switch to "PAL" on the
[Maintenance] page.
Flicker can be reduced by setting to "PAL" in the
area of commercial power frequency 50Hz.
For more details, refer to [Video Standard] on
the "[Maintenance] Page" in the
"INSTRUCTIONS" of the supplied CD-ROM.
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.
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
built-in lens, and is not a malfunction.
In particular, manual and auto pan operation
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near the TELE end (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.
For more details, refer to "[Time] Page" in the
"INSTRUCTIONS" on the supplied CD-ROM.
While viewing with the Built-in Viewer, audio
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sound may sometimes be out of
synchronization. This is not a malfunction.
When the monitor in use has a wide display area,
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lines may appear at the peripheral area of the
screen.
When the camera is mounted on a desktop, the
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monitor output image will appear inverted even
when [Installation Mode] is set to "Desktop".
An afterimage can appear if you view a moving
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object on the monitor output, however this is not
a malfunction.