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Cox-Box Will Not Take or Hold a Charge
—Is the Cox-Box being charged correctly?
Review the "Charging" section under Maintenance above and confi rm that proper procedures are being
observed when charging the Cox-Box.
—Is the correct charger being used?
Our chargers are rated 12VDC and 300mA and are sent to the user with a special plug attached. We
recommend that all chargers be purchased from NK, and that you do not modify a charger purchased
elsewhere for use with a Cox-Box.
—Is the charger working?
• Is the red LED illuminated when the charger is plugged in?
• Is the charger warm? A normal charger will be very warm after less than one hour's operation. If the
charger is not warm then it is not operating correctly. However, chargers can be warm, but
properly.
• Does the unit charge with a different charger? If so, then the fi rst charger is bad. If you suspect that your
charger is not working correctly you can perform the following test:
Obtain a multimeter—almost any type will do. Turn the multimeter on and set it at 20 VDC. After
plugging the charger in (be VERY careful, the charger is ON!),
place the positive lead from the multimeter on the plus pin,
and the negative lead from the multimeter onto the ground
pin. The multimeter should read between 13.5V -15V. Any
deviation from this range indicates that the charger is not
working. If you do not get any voltage reading on the multi-
meter, the internal transformer is damaged the charger must
be replaced.
NOTE: NK NO LONGER REPAIRS CHARGERS!
!
If you wish to repair a charger plug, you may obtain pins and instructions from NK. However, for most
people, the most cost- and time-effective approach is simply replacement.
—Have the batteries exceeded their lifespan?
A Cox-Box Battery is expected to provide 3 years of normal use (daily practices for approximately six to nine
months of the year). If you know your unit's batteries are older than three years, we recommend that the unit
be returned to NK for new batteries and servicing. We can often check our records to determine the age of
your unit's batteries.
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not
work
ground
nd
plus
plus
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