Set weapon HEIGHT and RADAR HEIGHT counters to 1000 METERS.
With the detent switch in the OFF position, set ∆ RANGE handwheel in detent.
Set RANGE counter to 7500 METERS.
Set TEST-NORMAL switch on right side of computer to TEST (prevents "C" unit from running to stops).
Set LOWER BEAM ELEVATION counter to 0 MILS, using the ELEVATION switch on the C-2014/MPQ-4A.
Connect the oscilloscope signal input lead to EL jack J881, and the ground lead to B+RET jack J897 (fig 257, TM
Loosen the gear clamp on potentiometer R821 (fig 288, TM 11-5840-208-30), and adjust for minimum amplitude
400-hertz signal on the oscilloscope. Tighten the gear clamp on the shaft of R821, and replace the elevation
subassembly in the computer.
Set SINGLE BEAM-DUAL BEAM switch to SINGLE BEAM, and set LOWER BEAM ELEVATION counter to +7
(10) Adjust new potentiometer R881 for minimum signal on the oscilloscope. The C dials should read 0. 0. Remove
oscilloscope leads from J881 and J897.
(11) Set elevation to +21 MILS. Test - Norm SW. To Normal.
(12) Adjust new potentiometer R884 for reading of 1. 00 on the calibrated "C" gears (right side of computer).
(13) Perform computer accuracy checks (single beam operation, 5-10) page 230.
c. Using the Computer Test Set TS-909/PPM procedure, set the SINGLE BEAM-DUAL EAM switch to the DUAL-BEAM
position and make the following computer control settings:
TIME counter M801 to 0. 0 second.
Weapon HEIGHT and RADAR HEIGHT counters to 1000 meters.
Detent switch S856 to OFF and ARANGE handwheel in detent.
RANGE counter M831 to 7, 500 meters.
TEST-NORMAL switch S855 to TEST.
d. Connect the test set as follows:
Power cable to receptacle J898 in the bottom of the computer drawer.
Test probe to EL jack J881.
Red test lead to -REF jack J890.
Black test lead to B+ RET jack J897.