JVC TK-C676 manual Precautions for Correct Operation,  Zooming,  Preset positions

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	: Approx. 30,000 hours

•Alarm output 1 relay : 200,000 times of operation

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.

•When electronic zooming is activated and the image does not contain a large enough contour component.

●To save energy, turn the system off whenever it is not in use.

●This camera has been designed for indoor use. It cannot be used out- doors.

●This camera has been designed to be hung from a ceiling, do not install it in an upright position on a surface or at an angle, as this may cause a malfunction or a noticeable shortening of its service life.

●Do not install or use the camera in the following locations.

•In a place exposed to rain or water. (The waterproof characteristics of the camera are equivalent to IEC 529.)

•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 subject to vibrations.

•In a place with excessive dust.

●Insufficient ventilation of the camera may cause a malfunction. Be care- ful 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 example 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 malfunc- tion

●When equipment that generates strong magnetism such as a transceiver 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 a distance of at least 3 meters from this unit.

●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 colors captured by the camera may differ from the actual colors 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 phenomenon normal to a solid-state image pickup devices (CCD) and is not a malfunction.

●The electronic shutter speed of the camera has been set to 1/50 sec- ond 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 control unit. (Note that the sensitivity will deteriorate slightly.)

However, when the ExDR function is ON, the flicker may not disappear.

●When the camera is used to monitor the same position over many hours ( e.g. continuously for 24 hours a day) the contact resistance of the panning mechanism may increase. This may cause the picture to be affected by noise interference or the remote control operation be- coming unstable.To prevent this happening, once a week, turn the sys- tem 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. Contamina- tion of the cover will lead to deterioration of the picture quality.

●Since the dome cover has a semispherical shape, the picture is distorted at the edges of the semisphere.When the camera is pointed for horizon- tal-direction shooting by tilting, it shoots the edge of the hemisphere, so that the picture may be distorted or out of focus.

●When an object is located near a light source or contains a large differ- ence in brightness, a ghost may interfere with the picture.This phenom- enon 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 the system off before proceeding.

•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 becomes exces- sively 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 op- eration or by selecting a preset position, focusing may deviate 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 electronic zoom can be preset up to x2.

However, if the electronic zoom menu on the screen is set to OFF even presetting the electronic zooming to x2 , the camera itself moves to the preset position without the electronic zoom- ing being activated.

•It is not permitted to preset the electronic zoom to a larger ratio than x2. The message “INVALID POSITION (D.ZOOM)” will appear on the screen if a larger ratio than x2 is set.

•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 oper- ated. The message “INVALID POSITION (TILT) will appear on the screen if a larger TILT position than 90° is set.)

ENGLISH

E-5