TM-9-1290-365-24-P
PALADIN MUZZLE VELOCITY SYSTEM M93 UPGRADED
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
OCTOBER 2000
TM-9-1290-365-24-P - Page 230 of 334
ARMY TM 9-1290-365-24&P
c. If low level of signal is distorted, replace Q6 and CR2.
D.5.12.6 DOPP(-) CHANNEL FAILURE. Failure in test procedures in para. D.5.12.2b., D.5.12.3a.,
D.5.12.4a.
a. Check that signal at U2/6 is greater than 2.5Vp-p. If signal is low or distorted, replace U2.
b. If high level of signal is distorted, replace Q3 and CR3.
c. If low level of signal is distorted, replace Q4 and CR4.
D.5.12.7 MAIN CHANNEL (STAGE 1 AND STAGE 2) FAILURE. Failure in test procedures in para.
D.5.12.2c., D.5.12.3c., D.5.1 2.4c.
a. Set attenuator on the test fixture to 40dB. Using oscilloscope probe, measure signal at Q1/base. If
signal is distorted, replace Q1 . If signal is still distorted, replace T1 .
b. Check signal at Q1/collector. Verify a signal gain of 100 minimum. Replace Q1 if necessary.
c. Check signal at Q2/base. If signal is low or distorted, check and replace L1, L2, one at a time.
d. Check the signal at Q2/collector. Verify a gain of 40 minimum (Q2/base to Q2/collector). Set
attenuator on test fixture to higher attenuation if signal is saturated. Replace Q2 if necessary.
e. Check signal at R9, R15 junction. If signal is low or distorted replace C7, C8. R9.
D.5.13 Final Testing.
D.5.13.1 FINAL TESTING PROCEDURES. This paragraph contains the final testing procedures. The test
setup provided in Figure D-21 . shows the equipment used and cable hookup for the first procedural step.
D.5.13.2 TEST DATA SHEETS. The test data sheets in Table D-9. are to be reproduced locally, as
required, for recording the test results. The test data sheets must be completed each time a test section is
performed. The completed test data sheets shall be retained.
D.5.13.3 PREPARATION FOR TEST.
a. Set attenuator on the test fixture to 100dB.
b. Energize and adjust DC power supply to measure +18 ± 0.2Vdc. Deenergize DC power supply.
c. Energize function generator. Set the function generator output to 50 ± 5KHz, sine wave, 2.5 ±
O.3Vp-p. Deenergize function generator.
d. Energize scope. Set the scope as follows:
(1) Input Scale: 5V/cm both channels
(2) Time Scale: 1 10ûsec/cm
(3) Sync Mode: Auto
(4) Display Mode: Alt
e. Energize the frequency counter.
f.
Before connecting the UUT to the test setup, verify that the power supply is deenergized.
g. Connect the UUT to the test setup lAW Figure D-21 . as follows:
(1) Connect lead E1 (red) to E1 on UUT
(2) Connect lead E2 (black) to E2 on UUT
(3) Connect lead E3 (blue) to E3 on UUT
(4) Connect lead E4 (white) to E4 on UUT
D-60
Back to Top
