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TM 750-245-4
Table 7-1. Mechanical Connections - Continued
Connector type
Illustration
Feedthru terminal bottom termination
Section III. ACCEPTANCE AND REJECTION CRITERIA
7-10. Acceptance Criteria
f. Insulation. The insulation shall not be charred,
All  soldered  connections  shall  be  inspected  for
frayed, split, or pinched through exposing the conductor
conformance to the following conditions:
wire.  Slight discoloration of insulation shall not be
considered cause for rejection.  Insulation clearance
a. Solder Connection. The solder connection shall
from the solder joint shall be as shown in table 7-2.
have a smooth, bright appearance, without porosity,
cracks, pits that bottom out, or surface strain lines.
g. Capillary Action (Wicking).
Wick length of
Solder shall cover the top of the conductor wire and
solder on the wire strands shall be visible and shall not
concave fillet should be observed between the lower
extend into the insulation.
half of the conductor wire and the terminal. There shall
h. Conductor Wire and Component Lead Tension.
be no foreign material or threads of insulation
All conductor wires and component leads going to a
embedded in the solder.
soldered connection shall have a slack in the form of an
b. Residual Flux. Each soldered connection shall
arc or gradual bend. Solder(d components shall not be
be inspected to determine that all flux has been
in electrical contact with adjacent circuitry; or other
removed.
components.
c. Excessive Solder.  Beads or peaks of solder
i. Excessive Heat.  Components and insulation
shall not project from the terminal and no solder shall
shall not show evidence of excessive heat caused by
exist as runs on the outside of the terminal. There shall
improper soldering or electrical shorts.
be no solder splatter on the adjacent components or
j. Multiple  Terminations.
The  number  of
surfaces.
connections per terminal shall be in accordance with
d. Cold Solder Joint.  The solder shall adhere
system requirements.  Each conductor wire shall be
firmly and smoothly to the parts joined. The joint shall
adjacent to the surface of the terminal, not overlapping
not be chalky in appearance, laking metallic luster, nor
another. Multiple connections on terminals shall be as
shall it have a rough, gritty, piled-up surface.
follows:
e. Rosin Joint.  Flux shall not be trapped in the
(1) Turret terminals.  The wire shall l)e in
solder joint. The conductor wire in the joint shall not
contact with the terminal for the full curvature of the
move under light probing pressure.
wrap and in no case wrapped less than 180
7-7

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