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D
Fan Field Replacement Procedure
The APEX1000 is factory-equipped with one fan for each of the hot-swappable QAM
modules, and one fan located inside each power supply unit, for a maximum total of five
(5) fans per unit. Each PS incorporates a single 12V Fan for internal cooling. (The airflow
direction and cooling is from front to back with respect to the chassis.)
Note: This procedure applies only to QAM module fans; power supply cooling fans are
not field-replaceable.
A fan failure is indicated with a solid red STATUS LED on the APEX1000's front panel.
When a QAM module fan fails, you must immediately replace it to ensure proper airflow
and cooling within the APEX1000. Fan replacement does not require powering down the
unit, as each fan plug can be disconnected from its power connector on the APEX1000's
rear panel.
Fan Removal
In a rack of APEX1000s, it is a good idea to identify any marginal fans and guarantee the
availability of adequate spares.
To remove a fan:
1. Identify the failing fan whose blade is not turning on the rear panel of the APEX1000.
Note: A failing fan blade does not turn, whereas a marginal fan may have a rasping
sound that is definitely a pitch off, and also surges in volume from the steady hum of
other fans.
2. Remove the four hex nuts and washers securing the fan cover to the fan. Save
these, as they must be re installed on the new fan.
3. Slide the fan cover off of the four stand offs.
4. Unplug the fan power cable from its connector. Note the orientation of the fan cable.
The fan blades face toward the APEX1000 and the rear of the fan motor faces away
from the APEX1000.
5. Slide the fan off of the four stand offs.
Appendix D • Fan Field Replacement Procedure
APEX1000 All-Purpose Edge QAM Software Version 2.4.x • Installation and Operation Manual
573408-001-a
Warning! Removal and replacement procedures include removing the fan
cover. Keep hands away from fan blades, and do not insert or drop
objects into exposed fan blades.
Appendix D
B
300
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