TM 1–1520–238–T–1
Change 5
4–55
4–8
MUX SYSTEM – INTERACTIVE FD/LS
4–8
CHECK (cont)
TASK
RESULT
b. On DEK (fig. 2–49),
rotate DATA ENTRY
switch to FD/LS
(ADC). On CDU (fig.
2–49.2), select FAB
FDLS (ADD).
If there are no system
failures, the following
message (prompt) will be
displayed:
ANY KEY FOR FD/LS
MENUS
When a list of failures is
displayed, the list is scrolled
by pressing and releasing the
ENTER/ SPACE key on the
DEK (ADC) or SPC key on
the CDU (ADD). Scroll until
the following message
(prompt) appears:
ANY KEY FOR FD/LS
MENUS
If no FD/LS displays appear
on HOD (fig. 2–34), the
advisory message: BBC IN
CONTROL FD/LS
NONFUNCTIONAL
POSITION appears on HOD,
or if PRI MUX indicator on
CPG caution/warning panel
(fig. 2–40) lights, refer to
TM 9-1230-476-20-2. Then
complete this FD/LS check.
If the advisory message:
CPG MUX NO–GO CHECK
CIR BRKR appears on HOD,
refer to TM 9-1230-476-20-2.
c. Obtain maintenance
menu by pressing
and releasing any
DEK key except
ENTER SPACE or
SHIFT (ADC); or any
key on the CDU,
except SPC (ADD).
If FD/LS menus do not
appear on HOD, refer to
TM 9-1230-476-20-2 for
troubleshooting the MUX
system.
