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 247 of 334
ARMY TM 9-1290-365-24&P
D.6.12.1 +5V OUTPUT FAILURE. Failure in test procedure para. D.6.11.3.1.
a. Check other output voltages. If exists, Check transformer T9.
b. Check for short circuit on output. If shortened, check L4, T9, and related components.
c. Proceed with troubleshooting lAW para. D.6.12.10.
D.6.12.2 ANTENNA POWER OUTPUT FAILURE. Failure in test procedure para. D.6.11.3.2.
a. Check the ON/OFF control circuit Q9 and its related components at both positions of ANT.SD
switch on the test fixture. At OFF, Q9 should not conduct any current. At ON, Q9 should be
saturated.
b. Check main transformers T3 and T4 output pins 5 and 4 for 270 ± 30KHz, 105 ± 2V positive
amplitude of the wave form. Check diodes CR7, CR8. Check transformer T6, and related
components.
c. Set ANT.SD switch to OFF. Check U3, pin 1 is less then 0.5V. Check CR10 conduct. Check Q4 is
cutoff.
d. Set ANT.SD switch to ON. Check Q4/Gate, is 0.1 to 0.5V. Disregard spikes below 1 .5V peak.
Check CR10 cutoff. Check Q4 is conducting.
e. Check output filter circuit T7 and related components.
D.6.12.3 +15V OUTPUT FAILURE. Failure in test procedure para. D.6.11.3.3.
a. Check main transformers T3 and T4 output pins 6 and 7 for 270 ± 30KHz, 20±1 V upper side
amplitude. Check diodes CR24, CR25.
b. Check the voltage regulator circuit U4 and its related components.
c. Check output filter circuit T8 and related components.
D.6.12.4 -15V OUTPUT FAILURE. Failure in test procedure para. D.6.11.3.4.
a. Check -20±1 Vdc on U5 pin 2. Check T3 and
T4.
Check diodes CR29, CR30.
b. Check the voltage regulator circuit U5 and its related components.
c. Check output filter circuit T8 and related components.
D.6.12.5 DOPPLER POWER OUTPUT FAILURE. Failure in test procedure para. D.6.11.3.5.
a. Check main transformers T3 and T4 output pins 13 and 14 for 270±30KHz, 25±2V upper side
amplitude. Check diodes CR44, CR45.
b. Check the voltage regulator circuit U8 and its related components.
c. Check output filter circuit T10 and related components.
D.6.12.6 SHUTDOWN FAILURE.
D.6.12.6.1 Failure in test procedure para. D.6.11.3.6.
a. Verify 2.5 Vdc on U10 /Cathode.
b. Press TOT.SD switch. Check less then 2V on U1, pin 6. If failed, check CR56, R65.
c. Check above 14V on U1, pin 7. If failed, replace U1 .
d. Check CR39 conducting capabilities.
e. If good, replace U2.
D.6.12.6.2 Failure in test procedure para. D.6.11.3.6b.
a. Press TOT.SD switch. Check less then 2V on U1, pin 6. If failed, check CR37.
b. Check below 1 V on U1, pin 1 If failed, replace U1 .
c. Check CR18 conduct.
d. If good, replace Q2.
D-77
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