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TM 11-5820-890-10-8
Frequency Hopping Multiplexer (FHMUX)
8.2g.
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
Item
Item to
Not Fully Mission
Operator
Capable If:
Procedure
Nr.
When
Check/Service
1
Before
CONTROLS:
The POWER ON
Place the POWER toggle
POWER SWITCH a.
indicator does not
switch to the ON position
illuminate and stay
and verify POWER ON
illuminated
indicator is illuminated.
OR
Watch the POWER
b.
any of the four
indicator and the four
BIT/FAULT indicators
BIT/FAULT indicators. The
does not illuminate
POWER should illuminate
then extinguish after
continuously and the four
five seconds.
BIT/FAULT indicators should
illuminate for approximately
five seconds after power-on
and then extinguish upon
successful completion of the
self test. The POWER ON
indicator should stay
illuminated.
FHMUX TROUBLESHOOTING PROCEDURES
ACTIONS
CHECKS
STEPS
YES: Continue
1.
Place the POWER toggle
1.
Verify Power On/Bit
NO: Contact Maintenance
switch into the ON position
and verify POWER ON
indicator is illuminated.
YES: Continue
2.
Verify that the four
NO: (a) Make note of the
BIT/FAULT indicators
BIT/FAULT Indicators
illuminate for approximately
that are illuminated.
five seconds and then
extinguish after power up.
(b) Inform unit
The POWER ON indicator
maintenance of the
should stay illuminated.
failure including the
status of the BIT/FAULT
indicators noted above.
8-23


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