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 248 of 334
ARMY TM 9-1290-365-24&P
D.6.12.7 REVERSE POLARITY FAILURE. Failure in test procedure para. D.6.11.3.7. Check CR1.
Replace if failed.
D.6.12.8 OPERATING RANGE FAILURE. Failure in test procedure para. D.611.3.8.
a. Adjust input voltage to l3Vdc. Check diodes CR15, CR47.
b. Check U1, pin 1 for more than +10V. If failed, replace U1 .
c. Check diode CR18.
d. Adjust input voltage to 17Vdc. Check U1, pin 1 for less then O.5V.
D.6.12.9 SHORT CIRCUIT PROTECTION FAILURE. Failure in test procedure para. D.6.11.3.9.
a. Press +5V SHORTING button, and verify voltage on R20 increases. If failed, replace T5.
b. Check diodes CR20, CR21, CR22.
c. Check Q10 is saturated when +5V SHORTING button is pressed. Replace Q10 if failed.
d. Check diodes CR53, CR54.
D.6.12.10 NO OPERATION FAILURES.
a. Check input filter circuit CR10, T1, T2, CR2, CR51 and related components.
b. Check U2, pin 7 for minimum 14Vdc. If failed, check startup circuit lAW para. D.6.1 2.11 .
c. Check U2, pin 6 for 270 ± 30KHz oscillations. If failed, check Q10 is not shortened. Verify 2.5Vdc
on U10 /cathode. Replace U10 if failed. Check less than 0.5V on U1, pin 7. Check diode CR39.
Else, replace U2.
d. Check Q1 /source for 28±1Vdc. If failed, check 36±1Vdc on Q1 /Gate. Check CR3, CR4, CR5.
Else, replace Q1 .
e. Check 28±1 Vdc on T5, pin 2. If failed, check L1 and T5.
f.
Check T3 & T4, pins 1 & 2 are not shortened or disconnected.
g. Check on Q3/gate for 270 ± 30KHz oscillations. If failed, check CR19, R1 9.
h. Check on Q3/drain for 270 ± 30KHz oscillations. If failed, replace Q3.
i.
Check T4, pins 1 & 2 for 270±30KHz, 23± 1V upper side amplitude. Check CR23.
j.
Check T5, pins 3 & 4 for 270 ± 30KHz, with amplitude below 3V. Disregard spikes. Check diodes
CR20, CR21, CR22.
k. Verify 2.5Vdc on U9/cathode. Check U6, pin-1 for 4 ± 0.5Vdc. Disregard spikes. Check
optocoupler OC2 conducts.
D.6.12.11 STARTUP CIRCUIT FAILURES.
a. Check that CR56 is not shortened.
b. Check diodes CR15, CR47.
c. Check U1, pin 1 for more than 12Vdc. If failed, replace U1 .
d. Check CR18.
e. Check Q2/gate for 16±1Vdc. If failed check R22, CR49.
f.
Check that Q2 conducts. If failed, replace Q2.
g. Check CR16.
D.6.13 Final Testing.
D.6.13.1 FINAL TESTING PROCEDURES. The final testing is performed on a reassembled UUT The test
setup provided in Figure D-26. shows the equipment used and cable hookup for the first procedural step.
D-78
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