TM 11-5840-208-30-1
Section II. COMPUTER CHECKS AND ADJUSTMENTS
5-6. GENERAL
a.
This section contains procedures to be followed in maintenance of the computer. Paragraph 7 provides data for
checking computer accuracy, and paragraph 8 contains computer alignment procedure.
b.
It is recommended that replacement of a defective component be followed by an adjustment or alignment of the
associated subassembly.
c.
Mechanical alignment of the computer subassemblies is accomplished at direct support maintenance facilities.
5-7. COMPUTER ACCURACY CHECKS
a.
The overall accuracy of the computer can be checked by using the computer to solve a series of 18 static
problems (chart I). Comparison of the approved solutions with the computed solutions may indicate the need for an
accuracy check, adjustment, or alignment of a particular subassembly.
(1)
Set the beam separation dial to read 35 mils.
(2)
Set the SINGLE DUAL switch to DUAL.
(3)
Operate the NORTHING switch until the NR counter reads 000000.
(4)
Operate the EASTING switch until the ER counter reads 000000.
(5)
Adjust the RADAR HEIGHT shaft until the HR counter reads 1,000 meters.
Place the ∆ R and ∆ A handwheels in DETENT.
(6)
(7)
With the LOWER BEAM AZIMUTH handwheel, position the azimuth strobe near the center of the scope.
ORIENT switch may be used when the radar is not oriented. )
Insert values of ∆t, H, RL, AL, and EL given in chart I.
(8)
(9)
Place the TEST-NORMAL switch in TEST.
(10) Release the ∆ R and ∆ A handwheels from DETENT and position them for the values of ∆ R and ∆ A
given in chart I.
(11) Place the TEST-NORMAL switch in NORMAL.
(12) Compare the computed solutions with the approved solutions.
(13) Set the beam separation dial to the value stamped on the reflection BEAM SEPARATION plate, and
compute the problems listed on page VIII, paragraph 10i.
b.
The accuracy of the C subassembly can be checked by inserting a series of eight static problems. Comparison
of computed and approved solutions may indicate the need for alignment of the C subassembly.
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