TM 11-5820-890-10-1
A diamond-shaped light on the display flashes if the battery is weak (a steady light
indicates that the battery is extremely weak or missing). The light only appears if
the keyboard display is active. Refer to the following illustration: then perform steps
a thru c to remove and change HUB:
a.
b.
c.
If you do not perform the following steps, you may risk radio failure during a mission.
NOTE
Whenever FCTN is set to
power is being drained from the
HUB battery. Use
to maintain data fills for mission readiness.
Set FCTN to
whenever radio is taken out of action at the end
of operation or mission. Turning off vehicular CB1, with RT in
does not prevent drain of HUB power.
Remove two screws and
HUB cover.
Remove HUB; then install
new HUB, inserting flat
end (positive) first.
Re-install HUB cover and
two screws (screws must
be tightened just until
snug enough to keep out
moisture).
Make sure your radio is assembled correctly (pages 2-16 thru 2-32).
Make sure you’ve done the following PMCS (pages 5-1 thru 5-7), and the
routine checks (page 5-16).
PMCS: Battery physical condition (page 5-3), battery electrical condition (page
5-3), HUB electrical condition (page 5-3), receiver-transmitter self-test (page
5-4), transmitter (page 5-5), mounting adapter and mounting base (page
5-5), remote operation (page 5-6), control-monitor self-test (page 5-6), con-
trol-monitor RT function control (page 5-7).
Routine checks: Antennas, cables and cable connectors, controls and
switches, mounting and assembly hardware (page 5-16).
Check battery life condition (page 2-30).
If FCTN is at
move it to
then move It to SQ ON.
Check required load (do you have the correct FH data, COMSEC keys and MAN
frequency?).
Make sure you can establish communication on each net you will be operating
In. If you cannot communicate, perform the communication troubleshooting
procedure on page 5-12 or refer to operator troubleshooting, page 2-51.
2-32
