Troubleshooting Logic Card A10

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

(paragraph 4-13)

(paragraph 4-13).

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

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.

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

(paragraph 4-13).

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

(paragraph 4-13).

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

(paragraph 4-13).

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.

4-39