4.
Power off the router as described in Disconnecting AC Power from the M40e Router
or Disconnecting DC Power from the M40e Router.
5.
Grasp the blown fuse by the edges and rock it in its slot until it comes loose and
disconnects. Rock up and down for a vertically oriented fuse (in the groups labeled
J241
through
J243
in Figure 125 on page 223) and side to side for a horizontally oriented
fuse (in the group labeled
J240
). If the cover slips off the fuse, snap the cover back
into place and begin again.
NOTE:
We recommend you use an insulated fuse removal tool to remove
fuses.
6.
Remove the appropriate spare fuse from the group of fuses labeled
J244
in Figure 125
on page 223. (The labels shown in the figure do not appear on the actual fuses—the
clear cover on every fuse reads
BUSS GMT-X
—but a table on the midplane below the
fuse box displays the same information.) Verify that the spare has the same rating
and color coding as the fuse it is replacing, as specified in Table 23 on page 224. To see
the indicator bulb and printed rating, look at the fuse from the side.
7.
For a vertically oriented fuse, orient the replacement fuse over the slot so that the text
on the fuse cover (
BUSS GMT-X
) reads from bottom to top. For a horizontally oriented
fuse, orient the replacement fuse over the slot so that the text on the fuse cover is
upside down.
8.
Press the new fuse into the slot.
9.
Power on the router as described in “Connecting AC Power to the M40e Router” on
page 119 for AC power or“Connecting DC Power to the M40e Router” on page 120 for
DC power.
10.
Verify that the yellow LED next to the replacement fuse is no longer lit.
11.
Reinstall the rear lower impeller by sliding it back into the chassis and tightening the
thumbscrew at each corner of the impeller cover. For complete instructions, see
“Installing the M40e Rear Lower Impeller Assembly” on page 176.
12.
Order new fuses from an electrical supply house to replace the spares in the
J244
group. The Cooper Bussman product number for each fuse is
GMT-
X
, where
X
is the
amperage rating. For example, product number
GMT-15
is a 15-A fuse, required for an
FPC.
Figure 125: Fuse Locations in the Fuse Box
223
Copyright © 2010, Juniper Networks, Inc.
Chapter 16: Replacing M40e Hardware Components
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