Maintenance Object Repair Procedures
555-233-123
10-450 Issue 4 May 2002
FAIL Failure to detect ground or faulty ground detected on Ring lead.
Display the hardware errors for this trunk, to determine if the
fault was on- or-off board. Look for Error Type 1025 or 1281 (if
both appear in the Hardware Error Log, pick the most recent
error). Error Type 1025 indicates a faulty ground detected on
Ring lead (an off-board fault) and Error Type 1281 indicates
failure to detect (internally generated) ground (an on-board
fault). Faulty ground detected on Ring lead (Error Type 1025):
NOTE:
On TN747B vintage 8 and greater circuit packs, an
incoming seizure during this test may cause it to fail with
an off-board fault.
1. Repeat test. If test passes, ignore the original failure. If test
aborts, follow the recommended procedures.
2. Repeat test with CO line removed.
3. If test fails, replace the circuit pack.
4. If test passes, refer problem to CO.
Failure to detect ground (Error Type 1281):
1. Run the long test sequence. If the CO Demand Diagnostic
Test fails, the Dial Tone Test (#0) fails with Error Code
2002, AND Error Type 3329 or 3585 appears in the
Hardware Error Log (with the same last occurred time as
Error Type 1281 and 1537), replace the circuit pack.
2. Repeat test with CO line removed.
3. If test fails, replace the circuit pack.
4. If test passes, the CO may be drawing too much current.
Refer problem to CO.
Table 10-166. TEST #3 CO Demand Diagnostic Test — Continued
Error
Code
Te s t
Result Description/Recommendation
Continued on next page
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