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Table 4-3. Helmet Sight Assembly 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 4-4. Linkage Assembly Test
TM 9-1270-212-14&P
Section V. LINKAGE ASSEMBLY TROUBLESHOOTING
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
shown in figure 4-10.
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

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