Troubleshooting guide

Section 20–COBRA
™
RET System Diagnostics Remote Electrical Downtilt System Handbook
20-2 May 2009 Bulletin 639519 • Revision D
There can be several reasons as to why an actuator is not found during a device scan.
20.1.1 Damage During Installation
When the power is applied from the COBRA controller and connected to a cable that is not properly
aligned with the keyed notch on the actuator, it is possible to damage one or more electronic compo-
nents in the actuator.
Note: Do not turn the power on the controller until the cables has been correctly installed.
WARNING!
When turning on the controller power and the green LED is fl ickering, turn the
power off immediately. This is indicating that there is a short circuit condition
somewhere within the AISG circuitry. The shorting condition can be caused by
improper installation or that the circuit inside an actuator has been damaged by
some external event such as a lightning strike.
20.1.2 Direct or Indirect Exposure to Lightning
An actuator is unlikely to survive a direct hit from lightning or even exposure to transients from an
indirect strike that exceed the component(s) surge specifi cation.
20.1.3 Product Failure
The antennas and actuators are 100% tested in the factory, so the chance of a failure out of the box
is rare. If an actuator is suspected to be malfunctioning, confi rm by isolating and scanning the single
actuator. If there is no communication, the actuator can be fi eld replaced or the entire antenna as-
sembly can be returned depending on the customer preference.
IMPORTANT!
If the electronic circuitry of an actuator has been damaged, it is possible that
it will cause further damage to the remaining actuators in cascade if the power
continues to be applied from the COBRA controller. The actuators that were not
located in the scan MAY NOT necessarily be the ones that need replacing. Cases
have been seen in the fi eld where an incorrectly installed or malfunctioning cable
can cause an actuator to be missed during a device scan.