TM 5-6350-280-23&P
Table 4-2. Troubleshooting Table - continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. SINGLE MODULE (MOD) FAILURE - continued.
NOTE
Do not remove and install CPU CCA(s) while equipment power is on.
Step 3.
Refer to TM 5-6350-280-10 turn equipment off, swap known good CPU CCA with suspect CPU CCA, and
refer to TM 5-6350-280-10 turn equipment on.
Observe monitor area status screen, if module COM failure moved to new module refer to
paragraph 4.6.8 and replace suspect CPU CCA, otherwise refer to paragraph 4.6.9 and replace
backplane.
3. TWO MODULE (MOD) FAILURES ON SAME BACKPLANE.
NOTE
·
A volt ohm meter (VOM) and oscilloscope are required for this procedure.
·
Do not seat CPU CCAs while equipment power is on.
Step 1.
Visually check to ensure CPU CCAs are securely seated in backplane.
If CPU CCAs are properly seated in backplane go to step 2, otherwise refer to TM 5-6350-280-10 turn
equipment off, ensure CPU CCAs are properly seated, and refer to TM 5-6350-280-10 turn equipment on.
Wait 30 seconds and check monitor area status screen, if module COM failures are still present go to step
2.
Step 2.
Using VOM check for +5 Vdc, at the +5 Vdc terminal, on both CPU CCAs.
If +5 Vdc is present go to step 5, otherwise go to step 3.
Step 3.
If CPU CCAs are mounted on left backplane disconnect connector P1 from connector J21. If CPU CCAs
are mounted on right backplane disconnect connector P2 from connector J21. Using VOM check for +5
Vdc on connector P1 or P2 at pins 3 (white lead) and 4 ground (black lead on connector P1 and black
and green leads on connector P2).
If +5 Vdc is present go to step 4, otherwise refer to paragraph 4.6.10 and disconnect DC power supply
cable assembly leads from DC power supply, disconnect connector P1 or P2 from left or right backplane
respectively, and replace DC power supply cable assembly. If module COM failures are still present on
monitor area status screen go to step 4.
NOTE
Do not remove CPU CCA(s) while equipment power is on.
Step 4.
Refer to TM 5-6350-280-10 turn equipment off, refer to paragraph 4.6.8 and remove CPU CCAs, and
refer to TM 5-6350-280-10 turn equipment on. Using, VOM check for +5 Vdc at terminals 2, ground, and
3 on CPU CCA connector mounted on backplane.
If +5 Vdc is present go to step 5, otherwise refer to paragraph 4.6.9 and replace backplane. If module
COM failures are still present on monitor area status screen go to step 5.
4-8
