MIL-I-46390(MU)
jumper is in addition to the jumper out-
tained between the common ground j and
lined in 4.5.2.3. With all jumpers in place,
B of J2 and E of J3 as specified in 3.6.5(a).
apply the voltage to the pins outlined in 3.6.
O b t a i n i n g a voltage reading at the second
position indicates a defective K1 system.
A voltage reading (using item 2 of 4.4.1.2)
Failure to obtain a voltage reading in fir-
shall be taken between pins R and T of J1.
ing position #2, will require opening and
This voltage reading shall be within the
reclosing the switch in the jumper between
limits specified in 3.6.4 (b). A voltage
pins L and J of J1. A voltage reading
reading shall be taken between pins L or K
shall be taken between the common ground
and pin J. This voltage reading shall be
j and pin C of J2 and pin D of J3. Failure
within the limits of 3.6.4 (c). Repeat pro-
to obtain a voltage at firing position #3
cedure above using alternate pins specified
indicates defective K27 Relay operation.
herein.
4.5.2.5 Operation of stepping switch coil,
4.5.2.4.1 When the stepping switch is in
interrupter firing sequence and reset. With-
the zero position, no voltage shall be present
out disturbing the electrical connections out-
(using item 2 of 4.4.1.2) between pin j and
lined in 4,5.2.4, continue opening and reclos-
any other pins of J2 and J3, in order to
ing the switch in the jumper located be
assure conformance with 3.6.5 (c). Con-
tween pins L and J of J1. When the volt-
tinuity (item 3 of 4.4.1.2) shall be present
age is transferred from one pin of J2
between pin j and any other pin on J2 and
and J3 to the next pin of J2 and J3, after
J3, and no continuity shall exist between
each reclosing of the switch, the stepping
the pins of J2 and J3 with respect to pin J
switch coil and interrupter are in accord-
of J8. The indicator light shall be ener-
ance with 3.6.5.1. Continue this opening
gized,
and reclosing the switch until all 24 firing
relays have been energized while simultane-
4.5.2.4.2 Remove the voltage from pins
ously recording the voltage reading, using
J1 and connect a jumper between pins M-J
item 2 of 4.4.1.2 and noting their sequence,
and L of J1. This jumper must contain a
Both shall conform to the requirement out-
push button switch located between pins L
lined in 3.6.5.2. After the last firing relay
and J; this jumper is in addition to those
has been energized, continue to open and
specified in 4.5.2.4. Closing the switch, the
reclose the switch specified above, eight (8)
Zero indicator light shall be deenergized as
more times. On the ninth reclosing of the
specified in 3.6.5 (b), and a voltage reading
switch, the reset indicator shall be energized
shall be taken between pins j and F of J3
as specified in 3.6.5.3.
and between j and A of J2. A voltage read-
ing indicates conformance with the require-
I
4 .5 .2 .6 Explosive blot operation. Prior
ments outlined in 3.6.4 (a), 3.6.6 (a), and
3.6.5 (d) ; and the normallY open contactso performing any test, determine that con-
t
of K1 are closed and the normally closed tinuity exists (using item 3 of 4.4.1.2) be-
contacts of K1 are open as outlined in tween the common ground f and the re-
3.6.5 (C) .
maining pins of J5. There shall be no con-
tinuity between either pin A or B of J4,
4.%2.4.3 Failure to obtain a voltage read-
and all pins of J5.
ing between pins j and A of J2, and j and
F of J3. Failure to obtain a voltage read-
4.5.2.6.1 Voltage and time check. Con-
ing on the specified pins will require open-
nect a jumper with a push button switch
ing and reclosing the switch between pins
between pin C and B of J7. This jumper
is in addition to the previously specified
L and J of J1 to move the wiper arm to
firing position #2. With the wiper arm in
jumpers. The actual test is performed by
connecting one channel of an oscilloscope
this position, a voltage reading shall be ob-
9
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