TM9-4935-481-14-1
C3
Table 3-10. DMS-D Maintenance Calibration-Continued
Table 3-10. DMS-D Maintenance Calibration-Continued
STEP
UNIT
PROCEDURE
CORRECTIVE ACTION
STEP
UNIT
PROCEDURE CORRECTIVE ACTION
411
CT
FUNCTION switch to PERIOD A.
FREQ/TIME/MULT switch to 11
412
CT
0
430
CT
Adjust A21-R25 to 200.00 + 1.00 msec.
413
MCP
Connect a cable from J13 to the oscilloscope A INPUT.
431
PD
Momentarily actuate READ switch and record the reading for use
414
MCP
SELECTOR A switch to E20.
DMM
415
MCP
SELECTOR B switch to E19.
in step 435.
416
TP
FREQ (HZ) switch to 10.0.
432
PD
Release the READ switch.
417
PD
Adjust LO FREQ AMPTD control to mid-range (15 turns from end).
433
PD
Momentarily actuate READ switch again and record the reading for
418
Adjust A21-R20 to mid-range (15 turns from end),
DMM
419
OSC
AUTO/NORM pushbutton to AUTO.
use in step 435.
420
Wait 3 minutes before continuing
434
PD
Release the READ switch.
421
OSC
Adjust A21-R20 SLOWLY in one turn increments cw, allowing
435
Add the values recorded in steps 431 and 433 and divide by two.
= 10 seconds between turns, until the oscillations
The result should be +2.997 to +3.003 Vdc.
diminish and cease.
Adjust the LO FREQ AMPTD control
422
Count the number of turns and adjust A21-R20 SLOWLY in one
(waiting > 3 minutes after
turn increments ccw, allowing - 10 seconds between
each adjustment) to +3.000 + 0.0030
turns, until the oscillations begin and amplitude increases
Vdc. Repeat steps 431 through 435.
towards - 13 VP.
436
PD
HORIZ/REF/VERT switch to HORIZ.
423
Disconnect all test leads from the oscilloscope.
437
ITP
INTERNAL TEST switch to 3.
424
Adjust A21-R20 cw 1/2 the number of turns noted in step 422,
438
PD
Actuate READ switch and adjust A21-R45 to 0.0750 + 0.0005 Vdc.
less one turn.
DMM
425
MCP
SELECTOR C switch to I22.
439
PD
Release the READ switch. Repeat 438 until no further adjustment
426
Wait > 3 minutes before continuing.
is required.
427
CT
Adjust A21-R17 to 100.00 0.50 msec,
428
TP
FREQ (HZ) switch to 5.0.
Simulated Tracker Detector Output Waveform 143-1355)
(1
429
Wait > 3 minutes before continuing.
440
TP
FREQ (HZ) switch to OFF.
441
MCP
SELECTOR B switch to H24.
442
CT
FREQ/TIME/MULT switch to 106.
443
CT
FUNCTION switch to FREQ A.
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