 |
|||
|
|
|||
|
|
|||
| ||||||||||
|
|
 TM 5-6350-262-14/4
minor.
Authorized repair of the cover includes
(3) Replace shield in terminal block mounting
replacement of unserviceable rubber grommet and
assembly.
gasket.
The grommet may be replaced complete by
reterminating input ends of loop sensor. Alternatively,
(4) Pull
choke
lead
wires
through
the replacement grommet may be split diagonally. To
replacement shield.
replace the cover gasket, proceed as follows:
Caution
(1) Pry defective gasket loose.
Ensure that green ground wire
inside SPU is attached to one of
(2) Clean mounting surface.
the upper terminal block mounting
screws
(3) Peel backing from self-adhesive gasket.
(5) Insert screws through terminal block,
(4) Install gasket (4, fig. C-) in cover (2) and
shield, and chassis.
press to secure.
(6) Assemble and tighten lockwashers and
b.
Chassis.
The need to replace the SPU
nuts.
chassis would involve visible damage to or loss of
continuity in the electrical interfaces:
(7) Resolder choke lead wires to terminal
(1) If necessary, replace the chassis (5) in
block
accordance with paragraph 2-8.
e.
Choke Replacement.
(2) If feasible, repair the chassis (5) in
(1) Unsolder defective choke lead wire(s)
accordance with subparagraphs c through e, below.
from terminal block.
Caution
(2) Remove nuts and lockwashers from
Turn off Control Unit Power to SPU
terminal block mounting screws
before undertaking repairs in
subparagraphs c through e below.
(3) Free
components
from
chassis;
c.
Terminal Block Replacement. Refer to
reassemble them; then, reinstall lockwashers and nuts
loosely at back of spacer blocks.
(1) Disconnect all wires from terminal block:
(4) Remove defective choke(s) from chassis:
(a)
Loosen screw terminals to free
(a) Unsolder choke lead wire(s).
wires from Control Unit (also SPU ground wire)
(b) Pry choke(s) loose.
(b)
Unsolder choke lead wires from
terminal block
(5) Clean chassis.
(c) Bend unsoldered choke lead wires
(6) Install replacement choke(s):
to prevent their falling through shield in subsequent
(a) Solder
choke
lead
wire(s)
to
operations.
capacitor(s).
(2) Remove
and
retain
four
screws,
(b) Install insulation on other choke
lockwashers and nuts.
lead wire(s).
(3) Remove defective terminal block.
(c) Solder
choke
lead
wire(s)
to
(4) Install replacement terminal block.
terminal board.
Caution
(7) Fasten choke(s) to chassis with adhesive.
Ensure that green ground wire
Caution
inside SPU is attached to one of
Ensure that green ground wire
the upper terminal block mounting
inside SPU is attached to one of
screws.
the upper terminal block mounting
(5) Install replacement terminal block.
screws
(a) Insert screws
through
terminal
(8) Reassemble terminal block assembly to
block, shield, and chassis.
chassis.
6-14. Solder Joint Repair
(b) Assemble and tighten lockwashers
a.
Only those electrical solder joints that
and nuts.
connect discrete wires will be repaired at direct support
(6) Reconnect wires to terminal block:
(intermediate) level.
b.
All soldering shall be done in accordance
(a) Resolder
choke
lead
wires
to
with MIL-STD454, Requirement 5.
terminal block.
6-15. Hookup Wire Replacement
a.
The need to replace a hookup wire should
(b) Reconnect Control Unit (and SPU
occur only as a result of inadvertent (accidental)
ground) wires to-terminal block and tighten terminal
damage.
screws.
b.
Replacement wire(s) shall have the same
d.
Shield Replacement.
electrical characteristics, color of insulation. Tubular
insulation (if bare wire), and termination as the original.
(1) Unsolder choke lead wires from terminal
c.
All soldering shall be done in accordance
block
with MIL-STD-454, Requirement 5.
(2) Remove terminal block mounting nuts,
d.
Dress SPU hookup wires as follows:
lockwashers, and screws.
(1) Twist two white wires from input and filter
assembly together (approximately one turn per inch);,
6-5
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals