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 227 of 334
ARMY TM 9-1290-365-24&P
D.5.12 Troubleshooting.
This paragraph contains the troubleshooting procedures for UUT
failures detected during testing. It is arranged in the sequence of test steps, and provides
information on addi-tional test steps required for the malfunction isolation.
Refer to Figure D-24. for additional troubleshooting information. Refer to FO-2 for schematic
diagram. Refer to Figure D-20. for components location.
CAUTION
The Doppler Amplifier CCA contains components subject to damage by
electrostatic discharge (ESD). Use approved grounding procedures before
touching, removing, or inserting CCA.
CAUTION
Deenergize all external power supplies and other test equipment when
CAUTION disassembling or reassembling the UUT.
NOTE
After completion of troubleshooting and repair, perform the complete test procedure from
the start.
D.5.12.1 POWER SOURCE AND VOLTAGE CIRCUIT TEST FAILURE. Failure in test
procedures in para. D.5.11.3.1.
a. Verify voltage is 15±1Vdc. Check and replace R19 or CR5 if voltage is out of range.
b. Verify voltage is 9±1Vdc. Check and replace R27 or R28 if voltage is out of range.
D.5.12.2 FUNCTIONALITY TEST FAILURE. Failure on para. D.5.11.3.2.
a.
If signal on channel 2 is low or distorted, check DOPP(+) channel. See para. D.5.12.5.
b.
If signal on channel 1 is low or distorted, check DOPP(-) channel. See para. D.5.12.6.
c.
If both channels are distorted check main channel. See para. D.5.12.7.
D.5.12.3 MAXIMUM OUTPUT MEASUREMENT SATURATION TEST FAILURE. Failure in test
procedures in para. D.5.11.3.3.
a. If signal at test point E6 is low or distorted, check DOPP(-) channel. See para. D.5.12.6.
b. If signal at test point E5 is low or distorted, check DOPP(+) channel. See para. D.5.12.5.
c. If both channels are not saturated, check main channel. See para. D.5.12.7.
D.5.12.4 BANDWIDTH TEST FAILURE. Failure in test procedures in para. D.5.11.3.4.
a. If signal at test point E6 is low or distorted, check DOPP(-) channel. See para. D.5.12.6.
b. If signal at test point E5 is low or distorted, check DOPP(+) channel. See para. D.5.12.5.
c. If both channels are distorted, check main channel. See para. D.5.12.7.
D.5.12.5 DOPP(+) CHANNEL FAILURE. Failure in test procedures in para. D.5.12.2a.,
D.5.12.3b., D.5.12.4b.
a. Check that signal at Ul/6 is greater than 2.5Vp-p. If signal is low or distorted, replace U1 .
b. If high level of signal is distorted, replace Q5 and CR1 .
D-57
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