Maintenance Object Repair Procedures
555-233-123
10-1768 Issue 4 May 2002
7,
129,
131, or
133
(cont’d.)
FAIL
(cont’d.)
NOTE:
If the loop around and conference circuit test fails for all
ports on a circuit pack, a -5 volt power problem is
indicated. If a TN736 or TN752 power unit circuit pack
is present, either the 631DB AC power unit or the 676B
DC power unit may be defective. (The 631DB power
unit is used in a medium cabinet powered by an AC
source. The 645B power unit is used in a medium
cabinet powered by a DC power source.) The system
may contain a TN736 or TN752 power unit circuit pack
or a 631DB AC power unit, but not both types of power
units. To investigate problems with a 631DB AC power
unit, refer to the CARR-POW (carrier port power unit for
AC-powered systems) Maintenance documentation. To
investigate problems with a 645B DC power unit, refer
to the CARR-POW (carrier port power unit for
DC-powered systems) Maintenance documentation. If
a red LED on TN736 or TN752 power unit circuit pack
is on, replace the pack.
If the test fails on more than 1 port, check for errors on
the TONE-BD or the TONE-PT. If errors, take
appropriate actions. When the tone errors are cleared,
rerun the test. If the test fails again, see FAULT
ISOLATION above.
PASS Tie trunk Loop Around and Conference Test is successful.
This port is functioning properly.
1. If users are reporting troubles, examine loop connections
to the port.
0NO
BOARD
The test could not relate the internal ID to the port (no board).
1. Check to ensure that the board translations are correct.
Translate the board, if necessary.
2. Issue the busyout board command.
3. Issue the reset board command.
4. Issue the release busy board command.
5. Issue the test board command. This should re-establish
the linkage between the internal ID and the port.
Table 10-648. TEST #33 Loop Around and Conference Circuit Test — Continued
Error
Code
Te s t
Result Description/Recommendation
Continued on next page
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