GRASS VALLEY IQUCP25, Руководство пользователя

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320
Maintenance & Troubleshooting
Cooling Fan Operational Assessment
Replacing a rear panel
To replace a rear panel in a Densité frame
1 If a card is already installed in a modular card slot served by the rear panel you are
changing, remove it first (see Removing a card , on page 320).
2 Remove the existing rear panel (either blank or belonging to an existing card) by
releasing the captive screws at the bottom.
There may be several captive screws, depending on the card type.
3 Position the new panel and secure it in place with the captive screw(s) at the bottom.
Removing a card
To remove a card
1 Open the front door of the frame.
2 Lift up the card ejector handle on the front of the card you want to remove, to lever the
connectors apart, and then use the handle to pull the card straight out of the modular
card slot.
3 Close the front door of the frame.
Installing a Card
See Installation of the Rear Connector Panel and Card , on page 31.
Cooling Fan Operational Assessment
A cooling fan has moving parts that, over time, can wear out. In the final stages of fan wear
out, the fan makes a distinctive sound and it rotates at a slower speed, thereby reducing
airflow which undermines its ability to remove heat from the UCP - 3901. Under this
condition, fan replacement is required.
Also, dust contained in the ambient air can accumulate on the fan and on surfaces around
the fan and heatsink, thereby reducing airflow, and preventing air from coming into direct
contact with the heatsink surfaces which undermines the ability to remove heat from the
UCP - 3901. Under this condition, cleaning is necessary and fan replacement may be
required.
Some diagnostic procedures may interrupt normal system operation. Changing the
UCP - 3901’s cooling fan will interrupt normal system operation. Down time can be
minimized by swapping in another known good UCP - 3901 to restore system operation
quickly. Schedule these maintenance operations during off hours when the system is not in
use.
Diagnostics
The UCP - 3901’s electronic circuitry generates heat that must be shed by forcing air to move
across heat-generating components. Reduced air flow or high ambient temperature results
in heat build-up within temperature-sensitive components within the UCP - 3901. This can
Note:
The rear panel must be installed before the card. See Replacing a rear
panel on page 320.