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|  MIL-F-45557B
4.5.2.2.1 Solenoid operation. Feeders shall be examined for sole-
noid operation requirement (see 3.2.17.1) after the solenoid dielectric
withstanding voltage test by applying 22 and 32 volts direct currant to
the solenoid to assure that the actuating shaft is operated to declutch
the feeder and that when the solenoid is de-energized it allows the
actuating shafts to return to its normal extended position under spring
action. (Do not energize the solenoid for more than 15 seconds.)
4.5.2.2.2 Solenoid dielectric withstanding voltage. Feeders shall
be examined for solenoid dielectric withstanding voltage requirements (see
3.2.17.2) rising a current limited high potential tester in accordance with
Drawing A7273225 and an electronic timer in accordance with Drawing
A7273227. The high potential voltage shall be applied for five seconds
between the coil terminals and grounded metal parts.
4.5.2.2.3 Electrical circuit. Feeders shall be examined for con-
tinuity (see 3.2.17.3 using a volt-ohm-milliameter tester in accordance
with Drawing A7273226. Continuity of the solenoid circuit shall be ex-
amined by applying the low voltage across connector pins "C" and "D".
Continuity of the rounds counter switch shall be examined by applying
the low voltage across connector pins "B" and "E" and rotating the
feeder shaft to assure that the stitch circuit closes and remains closed
f'or 160 degrees 10 degrees for each shaft revolution. Continuity of
the last round indicator shall be examined by applying the low voltage
across connector pins "A" and "B" and actuating the switch shoe to
assure that the circuit is open when the switch shoe is in the raised
position using dummy ammmition, and that there is no continuity when the
dummy ammunition is removed and the switch shoe is in the extended
position. During each check for continuity, the lead wires shall be
manipulated and any variation in the ohmmeter scale shall be considered
as attributable to a faulty connection.
4.5.2.2.4 Soldered connections. Examine feeders for securely
soldered lead wires (see 3.2.17.5) in the following manner:
a Remove the two screws and clamps that secure the insulation
sleeve to the rear coupling of the connector.
b Draw the insulation sleeve rearward and uncouple the
connector.
c Draw the grommet follower and the grommet rearward to
expose the soldered connection.
d Examine the soldered connections in accordance with the
visual and mechanical examination specified MIL-STD-
454, Requirement 5.
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