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

  TM-9-1290-365-24-P - Page 270 of 334

ARMY TM 9-1290-365-24&P
D.7.13.4.2.1 Incorrect or No Measurement Failure.
a. Choose “SHUTDOWN” option from the EVENT menu, verify the following message on screen
“SHUTDOWN COMPLETE”. Turn off power switch on tester, wait about 5 second and turn on the
power switch.
b. Temporarily replace U34 with a new component.
c. Re-run the test as many times as needed to perform the troubleshooting.
d. 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.
e. Check for logic level pulses on U13, pins 19 and 15. If failed, replace U13.
f.
Check for logic level pulses on U14, pins 12, 13 and 15. If failed, replace U14.
g. Check for logic level pulses on U19, pins 3 and 6. If failed, replace U19.
NOTE
Due to the short period of BIT execution, the troubleshooting might need to be performed
several times to verify the existence of events. Perform shutdown procedure, reset PC
and re-run software, reset 1553 simulator and re-run the test as many times as needed.
h. Check for logic 0 on U17 pin 6. If failed, replace U17.
i.
Check for logic 1 on U11 pin 12. If failed, replace Ul1 .
j.
Check for logic level square wave of 28KHz on U18, pin 8. If failed, replace U18.
k. Check for logic level square wave of 28KHz on U28, pin 2. If failed, replace U28.
I.
Check for logic 0 on Ul8 pin 6. If failed, replace U18.
m. Check for logic 1 on U28, pin 6. If failed, replace U28.
n. Check for logic level square wave of 28KHz on U18, pin 11. If failed, replace U18.
o. Check for logic level pulses on U4, pins 10, f=333KHz, and U4/1 7, f=41.6KHz. If failed, replace
U4.
p. Check for logic level pulses on U3, pins 3, 4, 5, 6, 10, 11, 12 and 13. If failed, replace U3.
q. Check for logic level pulses on U11, pin 2. If failed, replace U11.
r. If not failed, replace U12.
s. Replace EPROM’s U24, U25, U26.
D.7.1 3.4.2.2 Possible RAM Failures.
a. Choose “SHUTDOWN” option from the EVENT menu, verify the following message on screen
“SHUTDOWN COMPLETE”. Turn off power switch on tester, wait about 5 seconds and turn on the
power switch.
b. Temporarily replace U34 with a new component.
c. Re-run the test as many times as needed to perform the troubleshooting.
d. 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.
e. Check for 4.3 ± 0.3Vdc on diode CR4, cathode. If failed, check diode CR4 and capacitor C44.
f.
Check for logic 0 on U33, pin 5. If failed, replace U33.
g. Check for +4.5+0.5Vdc on collector of transistor Q1. If failed, replace Q1.
h. Repeat test. Re-run the test as many times as needed to perform the troubleshooting.
D-100


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