182 097-55501-01 Issue 6 – June 2003
1
TimeHub 5500 System Guide
5.3 Fuse Replacement
5.3.1 Clock Card
To replace the fuse on the clock card, follow the steps in Procedure 5-5, and
refer to Figures 5-1 and 5-5.
Procedure 5-5. Clock Card Fuse Replacement
Step Action
1 Put on a properly grounded ESD wrist strap.
2 Ensure that the card being removed is in Standby.
3 Using a #2 Phillips-head or Pozidrive screwdriver, loosen the captive screws at the top and
bottom of the card front panel.
4 Remove the card from the shelf.
5 Using a GMT fuse puller, remove the fuse from the fuseholder labeled XF1.
6 Replace the fuse with a 3 amp GMT fuse: when inserting the fuse, do not force; the fuse
should easily snap-fit into the fuseholder.
7 Insert the card into the shelf: ensure that the card aligns properly with its mating backplane
connector; push the card into place until it is fully seated into the backplane connectors.
8 Remove the card just enough so that it slides away from the backplane connector (to clear
the alarm).
9 Carefully re-insert the card into the shelf: again, ensure that the card is aligned properly
and is fully seated.
10 Wait for the Warmup lamp to turn off on the card (approximately 2 minutes to 20 minutes)
and the Tracking lamp to light.
11 Press the Cutoff pushbutton on the management card several times.
12 Verify that any alarm conditions are cleared.
13 Tighten the captive screws at the top and bottom of the card front panel.
End of Procedure
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