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 268 of 334
ARMY TM 9-1290-365-24&P
D.7.13 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 FO-3 for schematic diagram. Refer
to Figure D-37 for DSP pinout to schematic cross reference. Refer to Figures D-30, D-31, and D-32 for
components location.
CAUTION
The MVP CCA contains components subject to damage by electrostatic discharge. Use
approved grounding procedures before touching, removing, or inserting CCA.
NOTE
In all troubleshooting procedures, when additional disassembly or reassembly is required,
refer to the appropriate disassembly (D.7.6) or reassembly (D.7.11) procedure.
After completion of troubleshooting and repair, perform the complete test procedure from
the start.
D.7.13.1 SYNTHETIC DOPPLER FAILURES. Failure in test procedure para. D.7.12.3.
D.7.13.1.1
4MHz Failure. Failure in test procedure para. D.7.12.3b.
a. Check for 32MHz on oscillator U27 output. If failed, replace U27.
b. Check for 8MHz on DSP U34, pin 97. If failed, replace U34.
c. Check for 16MHz on U7, pin 14. If failed, replace U7.
d. Check for 4MHz on frequency divider U7, pin 12. If failed, replace U7.
D.7.13.1 .2 28KHz Failure. Failure in test procedure para. D.7.12.3c., d., e.
a. Check oscillator U41 for 28KHz on pin 1. If failed, check and replace C62, R63 or U41.
b. Check shaper U41, pin 2 and related components.
NOTE
On version AY6707288-4 and AY67010314 the 28KHz exists briefly, during BIT. Repeat
test several times, if required.
c. For version AY6707288-4, check U41 pin 13, U28 pin 10, and U17 pin 16.
d. For version AY6701 0314, check Ul7 pin 16, and U28 pin 10. Check transistor Q3 and related
components. Repeat test several times, if required.
D.7.13.1.3
Vppl,2 or 3 Failure. Failure in test procedure para. D.7.12.3.f.g. h.
Check diodes CR14,
CR15, CR16. If failed, replace.
D.7.13.1.4
Failure in Test Procedure Para. D.7.12.3i., j. Applicable only on versions AY6707288-4 and
AY6701 0314.
a.
Check U39 for 2.5 Vdc on cathode.
b.
Check comparator U29, pin 1, and related components.
D-98
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