Trouble locating and clearing procedures (continued) 1-117
DMS-100 Family NA100 Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Replacing a 14-in. disk drive unit
(continued)
At the front of the DDU shelf
17
Find the DDU.
18
Turn OFF the power switch on the power converter next to the DDU. Ensure
that the LED on the power converter is on. A lit LED indicates that the power
switch is OFF.
19
Remove the fuse that powers the DDU.
Note: The fuse that powers the DDU is on the frame supervisory panel.
WARNING
Static electricity damage
When you handle the DDU, wear a wrist strap that connects
to a wrist-strap grounding point. A grounding point will be
on the frame supervisory panel (FSP) or a modular
supervisory panel (MSP). The wrist-strap protects against
static electricity damage.
If the DDU
Do
is in a packaged-core power
module
(PCPM)
or
pack-
aged-core maintenance module
(PCMM) frame of a switch
package
step 19
is in other than listed here
step 18
CAUTION
Remove the correct fuse.
Make sure that you remove the correct fuse. If you remove
the wrong fuse, loss of service or a shutdown of MAP
terminals and printers can result. Loss of recording space for
billing information can occur.
If the DDU
Do
is not a DMS-100P and the DDU
is on shelf 04
step 20
is not a DMS-100P and the DDU
is on shelf 18
step 21