TM 9-4120-388-14
4-44. RADIO FREQUENCY FILTER (FL1) - Continued.
Capacitors can retain a high electrical charge. Touching the terminals of a
charged capacitor can result in severe electrical shock and skin burns. Always
ground terminals of a capacitor as soon as they are exposed.
(3) Disconnect the (P10) and (P11) plugs from the radio frequency filter.
(4) Discharge filter capacitors at connector, (J10) using a dropping resistor.
(5) Remove six screws from mounting plate and filter.
(6) Separate filter mounting plate and radio frequency filter.
b. Inspection/Test
(1)
Check radio frequency filter for dents, punctures, and evidence of overheating.
(2)
Check connectors (J10) and (J11) for loose, missing, or broken contacts.
Replace filter if badly dented, punctured, burnt, or connectors have loose, missing or broken contacts.
(3)
Using multimeter, check continuity between (J11) contacts A, B, and C to filter case. If continuity is indi-
(4)
cated, replace filter.
(5)
Using multimeter, check continuity as shown in following table.
Indication
To receptacle
From receptacle
J11, pin
J10, pin
A
Continuity
A
None
B
A
None
A
C
None
D
A
B
Continuity
B
None
C
B
None
D
B
C
Continuity
C
None
D
C
D
D
Continuity
(6) If filter does not meet continuity requirements, replace it.
NOTE
Continuity testing does not necessarily predict the behavior of capacitors under load. If
the filter still does not operate properly after passing the continuity test, substitute a filter
known to be good.
Installation.
c.
(1) Secure filter to mounting plate with six screws.
(2) Connect (P10) plug and harness to (J10) connector on filter.
(3) Connect (P11) plug and harness to (J11) connector on filter.
(4) Secure mounting plate to casing with eight screws.
(5) Connect power.