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Table 4-7. Sequence Card A9 Test cont'd
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TM-9-1270-212-14-P Fire Control Subsystem Helmet Directed XM128 P/N 2277716-00 NSN 1270-00-122-9449 Manual
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Table 4-8. Logic Card A10 Test
TM 9-1270-212-14&P
4-23. Troubleshooting Logic Card A10.
c. Set the POWER switch to ON-60 HZ if a 60-Hz
power source is used or to ON-400 HZ if a 400-Hz power
source is used.
NOTE
d. Set the multimeter range switch to 100 and the
These procedures check out a logic card Al O
function switch to DC V.
from the EIA used in XM128. Refer to figure
B-10, foldout FO-7, the part number on the
e. Perform the tests in table 4-9. If any of the tests fail,
logic card, and the identification plate on the
power supply card Al2 is defective and should be replaced.
EIA to determine that the correct logic card is
being tested.
4-26. Troubleshooting Amplifier Card A13.
a. Perform the test-set preliminary procedures
a. Perform the teat-set preliminary procedures
b. Connect card Al0 to the J8 LOGIC CARD receptacle
b. Connect card A13 to the J9 COMPARATOR/AMPL
on the test set.
CARD receptacle on the test set.
c. Set the POWER switch to ON-60 HZ if a 60-Hz
c. Set the POWER switch to ON-60 HZ if a 60-Hz
power source is used or to 0N-400 HZ if a 400-Hz power
power source is used or to ON-400 HZ if a 400-Hz power
source is used.
source is used.
d. Set the multimeter range switch to 10 and the
function switch to AC V.
d. Set the multimeter range switch to 10 and the
function switch to AC V.
e. Perform the teats in table 4-8. If any of the teats fail,
logic card Al0 is defective and should be replaced.
e. Perform the procedures in table 4-10. If any of the
steps fail and the associated adjustments do not remedy the
failure, replace the circuit card.
4-24. Troubleshooting Comparator Card A11.
4-26.1. Troubleshooting Logic Card A15.
a. Perform the test-set preliminary procedures
NOTE
b. Connect card A11 to the J9 COMPARATOR/AMPL
These procedures check out a logic card Al 5
CARD receptacle on the test set.
from the EIA used in XM136. Refer to figure
B-10, foldout FO-10.1, the part number on the
c. Sat the POWER switch to 0N-60 HZ if a 60-Hz
logic card, and the identification plate on the
EIA to determine that the correct logic card is
power source is used or to 0N-400 HZ if a 400-Hz power
source is used.
being tested.
a. Perform the test-set preliminary procedures
d. Set the TEST SELECT switch to 6 and the CARD
switch to 4, and observe that the following indicators are
lighted: DS2, DS3, DS4, DS5, and DS6. If any of the
b. Connect card Al5 to the J8 LOGIC CARD receptacle
indications are abnormal, replace the card.
on the test set.
e. Set the teat set switches used to OFF and disconnect
c. Set the POWER switch to ON-60 HZ if a 60-Hz
the card and the test set.
power source is used or to ON-400 HZ if a 400-Hz power
4-25. Troubleshooting Power Supply Card A12.
source is used.
a. Perform the test-set preliminary procedures
d. Set the multimeter range switch to 10 and the
function switch to AC V.
b. Connect card Al2 to the J6 POWER CARD
e. Perform the tests in table 4-11. If any of the tests fail,
receptacle on the test set.
logic card Al 5 is defective and should be replaced.

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