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KMX-3921
Installation & Service Manual
inspect the card’s fan assembly: remove any accumulated dust and dirt from the card with
compressed air and remove any obstruction to the fan’s ability to freely rotate.
Reinsert the card into the frame and restore system operation to see if the fan alarm
becomes inactive.
The card’s onboard circuitry monitors the fan motor’s rotational speed to detect that the
fan is rotating fast enough to provide sufficient cooling; it raises a fan alarm when the fan’s
rotational speed has gone below a factory-set threshold.
When the card’s fan is not rotating fast enough (as detected by a fan alarm), is making
abnormal noises, or is not rotating at all, the fan is worn out and it must be replaced with a
new one.
Identifying the Fan to Replace for a Fan Fail Alarm
As some cards have more than one fan, identify in XAdmin the specific fan to be changed
on the card: check each card individually for a fan fail alarm.
Fans are located on certain cards and within the multiviewer’s frame. To replace a fan:
• on a card, see
• within the multiviewer’s frame, see
Replacing the Frame Ventilation Fans
in the
Densité 3+ FR1 1RU Housing Frame for Densité Modular Products User Manual
or in the
Densité 3+ FR4 Housing Frame User Manual
. See
