TM 1–1520–238–T–1
Change 5
4–131
4–34 DNS – INTERACTIVE FD/LS CHECK
4–34
(ADD) (cont)
TASK
RESULT
c. On CDU, press and
release 0 and 8
keys.
If any MUX NO–GO appears
on HOD, refer to
TM 9-1230-476-20-2 for
troubleshooting the MUX
system.
When MUX
COMMUNICATION GO
appears on the HOD, go to
next step.
e. On CDU, press and
release 3 and 4
keys.
If one or more FD/LS
NO–GO displays listed
appear on the HOD, perform
the following in sequence.
(1) Perform SYSTEMS
– POWER DOWN
(para 3–2) and APU
shutdown (para 3–3).
(2) Perform CORRECTIVE
ACTION indicated for first
NO–GO displayed on
HOD.
(3) Perform SYSTEMS
– POWER–UP
(para 3–1).
(4) Repeat FD/LS check
beginning with step 2. If
NO–GO repeats after
CORRECTIVE ACTION,
refer to
TM 11-1520-238-23-2.
3. Perform SYSTEMS – POWER DOWN (para 3–2) if
power no longer required.
FD/LS NO–GO
DISPLAY
CORRECTIVE ACTION
SIGNAL DATA
CONV–COMP
NO–GO LH AFT
CATWALK
Replace SDCC
TM 11-1520-238-23-1.
RCVR–XMTR ASSY
NO–GO BELLY
Troubleshoot wiring to isolate
fault TM 11-1520-238-23-2.
