Section V. LINKAGE ASSEMBLY TROUBLESHOOTING

TM 9-1270-212-14&P

position. Use the LOD bubble and adjust the

4-17. General.

swivel frame if necessary; this insures that the

rails are not twisted.

This section provides troubleshooting procedures for the

gunner and pilot linkage assemblies by using the test set.

b. Connect the test set, LOD, and linkage assembly as

The tests should be performed on the bench. The tests are

identical for the two linkage assemblies.

c. Adjust the LOD azimuth angle and elevation angle

4-18. Linkage Assembly Checkout Procedures.

with a combination square (fig. 4-10).

procedures

a. Perform the test-set preliminary

d. 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

e. Set the multimeter range switch to 10 and function

When the test is performed on a bench, the

switch to AC V.

linkage assembly must be placed on a level

surface with the mounting brackets and rails

f. Perform the procedures in table 4-4.

also leveled. Lock the LOD in the 0-degree

Figure 4-10. Linkaga assembly test setup

4-22