Nortel North American DMS-100 Instruction Manual page 132

At the front of the DDU shelf
17
18
19
DMS-100 Family NA100 Trouble Locating and Clearing Procedures Volume 2 of 2 LET0015 and up
Trouble locating and clearing procedures (continued)
Replacing a 14-in. disk drive unit
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.
Find the DDU.
If the DDU
is in a packaged-core power
module (PCPM)
aged-core maintenance module
(PCMM) frame of a switch
package
is in other than listed here
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.
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.
Remove the fuse that powers the DDU.
Note: The fuse that powers the DDU is on the frame supervisory panel.
If the DDU
is not a DMS-100P and the DDU
is on shelf 04
is not a DMS-100P and the DDU
is on shelf 18
Do
step 19
or pack-
step 18
Do
step 20
step 21
1-117
(continued)