10
Troubleshooting
If the red
OVERTEMP LED
and the audible alarm come on, the unit has overheated, and it
will shut down until it cools off sufficiently. You may not have allowed sufficient space around
the unit for cooling, or there may be too many devices connected to the output of the unit.
Either reduce the number of devices connected to the unit, or reposition the unit for better
cooling. If necessary, direct a stream of moving air over the unit.
If the yellow
LOW INPUT LED
and the audible alarm comes on, the input voltage has
dropped to below a usable level.
If the
LOW OUTPUT LED
and the audible alarm come on, and the green
OUTPUT ON LED
is completely off, the output of the unit has been shorted out, or there has been an internal
failure. Turn the unit off, disconnect all the loads connected to it, and turn it back on again. If
it comes on normally, turn it off again, reconnect one load, and turn it back on. Continue recon-
necting loads until the short circuit condition returns. Turn the unit off, disconnect the faulty
load, and reconnect it only after the fault is found and rectified. If the condition still exists
even after all the loads have been disconnected, the unit is defective, and must be returned to
the factory or an authorized service center for repair.
If the unit will not turn on at all, check the input fuse. To do this, first turn off the unit and
disconnect the power cord. Next, remove the negative battery lead and cover the end with non
conductive material such as tape. Repeat this with the other battery lead. This will prevent an
accidental discharge from the battery. Remove the fuse and check it with an ohmmeter. If it is
blown, replace it with a new one. If that fuse blows as well or the unit still will not turn on, it
is defective, and must be returned to the factory or an authorized service center for repair.
If the batteries are hooked up backwards the output fuses will blow. To change them follow
the same procedure as for the input fuse.
If both the input and output fuses are good and the unit still does not function it must be
returned to the factory for servicing.