Avaya Definity SI, Maintenance Manual, Page: 1685 / 2968

HYB-LINE (Hybrid Line)
Issue 4 May 2002 10-899 555-233-123
57 FAIL Hybrid Circuit Test failed. This could result in noisy or bad
connections.
1. This error can be caused by a disconnected terminal.
First, ensure that the terminal is connected and the wiring
is OK.
2. Run circuit pack tests to check the Tone Generator circuit
pack and the Tone Detector circuit pack using test board
PCSS short.
3. Resolve any problems that are detected on the Tone
Generator circuit pack or Tone Detector circuit pack.
4. If the Tone Generator and Tone Detector circuit packs are
functioning properly, and the test still fails, replace the
Hybrid Line circuit pack.
NOTE:
If the Hybrid Circuit 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, the 631DB AC 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 either a TN736 or a 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 CARR-POW
(Carrier Port Power Unit for AC-Powered Systems)
Maintenance documentation. To investigate problems
with a 645B DC power unit, refer to CARR-POW
(Carrier Port Power Unit for DC-Powered Systems)
Maintenance documentation.
Table 10-326. TEST #57 Hybrid Circuit and Conference Circuit Test — Continued
Error
Code Test
Result Description/Recommendation
Continued on next page