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 272 of 334
ARMY TM 9-1290-365-24&P
e. Check for logic level square wave of 50KHz on U28, pin 6. If failed, replace U28.
f.
Check for logic 0 on U18, pin 8. If failed, replace U18.
g. Check for logic 1 on U28, pin 2. If failed, replace U28.
h. Check for logic level square wave of 50KHz on U18, pin 11. If failed, replace U18.
i.
If not failed, replace U2.
j.
Replace EPROM’s U24, U25, U26.
D.7.13.4.4
Acceleration Switch Failure. Failure in test procedure para. D.7.12.6n.
a. Choose “SHELL” option from the EVENT menu. Re-run the test as many times as needed to
perform the troubleshooting.
b. lightly tap with finger on the acceleration switch AC1 housing. Check for +1 5Vdc pulses on diode
CR3, anode. Check resistor R13.
c. If not failed, replace acceleration switch AC1.
D.7.13.5
PROCESSOR CIRCUITRY NO OPERATION FAILURES.
a. Remove U34.
b
Check Program Memory Address (PMAO through PMA1 3, PMDA, PMRD, PMS) bus for short to
ground. Refer to Figure FO-3, sheet 2 for pin number designation. Refer to Figure D-37. for DSP
pinout to schematic cross reference. If a short is visibly recognizable, remove it. Check the resistor
networks Z5 and Z6. If not failed, the short is caused by one of the EPROM’s, U24, U25, U26.
Replace one by one the EPROM’s, and repeat the short test.
c. Check Program Memory Data (PM DO through PMD23) bus for short to ground. Refer to Figure
FO-3, sheet 2 for pin number designation. If a short is visibly recognizable, remove it. Check the
resistor networks Z1, Z2, and Z3. If not failed, replace the component (U24, U25, or U26) that
causes the short circuit.
d
Check Data Memory Address (DMAO through DMA13, DMWR, DMRD, DMS, DMACK) bus for
short to ground. Refer to Figure FO-3, sheets 2, 3 and 4 for pin number designation. If a short is
visibly recognizable, remove it. Check the resistor networks Z9 and Z10. If not failed, the short is
caused by one of the components on the bus, U13, U14, U42, U31, U32. Replace one by one the
components, and repeat the short test.
e. Check Data Memory Data (DMD0 through DMD15) bus for short to ground. Refer to Figure FO-3,
sheets 2, 3 and 4 for pin number designation. If a short is visibly recognizable, remove it. Check
the resistor networks Z7, Z8 and Z9. If not failed, the short is caused by one of the components on
the bus, U15, U2, U12, U17, U31, U32, U4, U42. Replace one by one the components, and repeat
the short test.
f.
Temporarily replace U34 with a new component.
g. Repeat test again.
h. If the failure does not reappear, the malfunction is corrected. U34 was the failed component. If the
failure reappears, reassemble the original U34 and proceed with steps below. Re-run the test as
many times as needed to perform the troubleshooting.
i.
Check for logic 1 on U33, pins 10 and 16. If failed, replace U33.
j.
Check for logic 0 on U33, pin 15. If failed, replace U33.
k. Check for 4.3 ± -0.3Vdc on diode CR4, cathode. If failed, check diode CR4 and capacitor C44.
I.
Check for logic 0 on U33, pin 5. If failed, replace U33.
m. Check for +4.5+0.5Vdc on collector of transistor Q1. If failed, replace Q1.
D-102
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