Precautions For Correct Operation - JVC TK-C655 Instructions Manual

Precautions for Correct Operation

Note on consumable parts
The following parts are consumable and should be replaced
after a certain number of hours or a count of operations.
The service lives given below are only typical values. They
may vary depending on the operating environment and
conditions.
Note that the replacement of consumable parts is charge-
able even when they are replaced before the termination of
the warranty period.
• Zoom lens assembly
Zooming operation : 2 million times
Focusing operation : 4 million times
• Slip rings : 5 million operations
• Cooling fan : 30,000 hours approx.
Note on auto focusing
Although this unit incorporates a one-push auto-focusing
system and EASY AF functions, auto-focusing may some-
times be impossible depending on the object and camera
setup. In this case, adjust the focusing manually.
Objects and images with which auto focusing may be difficult:
• When the image brightness is extremely high.
• When the image brightness is extremely low.
• When the image brightness varies continuously (for ex-
ample when the object is a flashing light).
• When the image contrast (difference between bright and
dark) is very poor.
• When the image does not contain a vertical contour
component.
• When vertical stripe patterns recur on the screen.
Camera setups with which auto focusing may be difficult:
• When the AGC is activated and the image is coarse.
• When SENSE UP is activated and the image contains
only little motion.
● To save energy, turn the system power off whenever it is not in
use.
● This camera has been designed for indoor use. It cannot be used
outdoors.
● This camera has been designed to be hung from a ceiling with its
base uppermost. Do not install it in an upside down position on a
surface or at an angle, as this may cause a malfunction or a no-
ticeable shortening of its service life.
● Do not install or use the camera in the following locations.
• In a place exposed to rain or water.
• In a place containing vapor or oil soot, for example in a kitchen.
• In a place outside the operating temperature range (-10°C to
50°C).
• Near a source of strong radio waves or magnetism, radiation or
X-rays.
• In a place where corrosive gasses are generated.
• In a place subject to vibrations.
• In a place with excessive dust.
● Insufficient ventilation of the camera may cause a malfunction.
Be careful not to block ventilation to the camera.
This unit radiates heat from the panel surfaces (top panel and
side panels). Do not install it in a place where a heat pool may
form, such as near a wall.
● Do not install the camera in a place exposed to cold air, for exam-
ple near to the air outlet of an air conditioner. Otherwise, moisture
may become condensed inside the dome cover.
● Do not point the lens at a strong light source, for example the sun,
doing so may cause the camera to malfunction.
● The camera incorporates an AGC circuit. As a result, when it is
used under low light conditions, the camera gain may increase
automatically. This makes the picture appear uneven , however
this is not a malfunction
● When equipment that generates strong magnetism such as a trans-
ceiver is used near to the unit while the AGC circuit is ON, beat
noise, etc may interfere with the picture. If a transceiver or similar
equipment is used, keep it at a distance of at least 3 metres away.
● In auto iris mode, when the AGC circuit is ON, varying the iris with
the iris control button may not change the picture brightness. This
is due to the automatic gain boost by the AGC circuit. In this case,
set AGC to OFF or use the manual iris mode.
● In auto iris mode, the iris control button may not function under
certain brightness conditions (i.e. when a sufficient amount of light
cannot be obtained). In this case, set the iris mode to manual.
● When the camera is used in ATW (Auto White balance) mode,
the colours captured by the camera may differ from the actual
colours being shot due to the mechanics of the auto-tracking
operation within the white balance circuit. However, this is not a
malfunction.
● If a very bright object (such as a lamp) is being monitored, the
picture may contain vertical lines (smear) above and below the
bright object in the picture. This is a normal phenomenon for solid-
state image pickup devices (CCD) and is not a malfunction.
● The electronic shutter speed of the camera has been set to 1/50
second at the factory. If the camera is used under a fluorescent
light source in an area with a local power frequency of 60 Hz,
change the shutter speed to 1/120 second using the remote con-
trol unit. (Note that the sensitivity will deteriorate slightly.)
However, if the ExDR function is ON, the flicker may not disap-
pear.
● When the camera is used to monitor the same position over many
hours ( e.g. continuously for 24 hours a day) the contact resist-
ance of the panning mechanism may increase. This may cause
the picture to be affected by noise interference or the remote con-
trol operation becoming unstable. To prevent this happening, once
a week, turn the system off and on in order to initialize the camera
and to clean the contacts.
● Do not touch the lens on the dome cover directly by hand. Con-
tamination of the cover will lead to deterioration of the picture
quality.
● Since the dome cover is of a semispherical shape, the picture
is distorted at the edges of the semisphere. When the camera
is pointed for horizontal-direction shooting by tilting, it shoots
the edge of the hemisphere, so that the picture may be dis-
torted or out of focus.
● When an object is located near a light source or contains a large
difference in brightness, ghosting may occur. This phenomenon
is due to the characteristics of the dome cover and the built-in
lens and is not a malfunction.
● Observe the following points when carrying out maintenance of
the camera.
• Turn off the power to all equipment to be used before proceed-
ing.
• Clean the dome cover using a lens cleaning cloth (or tissue).
The dome cover may become stained in a very short period in
certain operating environments. If the dome cover lens be-
comes excessively contaminated, clean it with a lens cleaning
cloth (or tissue) moistened with a solution of neutral detergent
in water.
Zooming
When zooming is stopped near the TELE end during manual
operation or by selecting a preset position, focusing may de-
viate slightly. In addition, the manual zooming operation may
not always be smooth.
These phenomena are due to the characteristics of the built-
in lens and are not malfunctions.
Preset positions
• The zooming position of the camera can be set to a total of
100 preset positions, including the home position.
• The TILT position can be set and operated only between
0° to 90° even when the item "FLIP" is set to DIGITAL.
(A TILT position between 91° and 180° cannot be set or
operated. The message "INVALID POSITION (TILT) will
appear on the screen if a larger TILT position than 90° is
set. )
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