JVC VN-C655U - Manual (Page 7)

7
Ⅵ Zooming
When zooming is stopped near the Telephoto end
during manual operation 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.
Ⅵ 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 ON.
Ⅵ Observe the following points when carrying out
maintenance of the camera.
• Turn off the power to all equipment to be used
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 excessively con-
taminated, clean it with a lens cleaning cloth (or
tissue) moistened with a solution of neutral de-
tergent in water.
Ⅵ 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 oper-
ating environment and conditions.
Note that the replacement of consumable parts
is chargeable even when they are replaced be-
fore 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.
Ⅵ Note on auto focusing
Although this unit incorporates a one-push
auto-focusing system and EASY AF functions,
auto-focusing may sometimes 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 continu-
ously (for example when the object is a flash-
ing 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 im-
age contains only little motion.
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