DOM MB Diagnosis page

Board ID:

Rev 5.0 SN 0304

Source:

From  HASS testing.

Symptoms:                            

Fails Local Coincidence Loopback tests failed during HASS but not at end.

Analyst(s):

G. Przybylski

Analysis Procedure(s):

Tests with terminations on transformer output produce reasonable signals around the power splitters.
TP14 decodes both polarities for large signals.
LC waveforms faulty around Z2.
Open trace between TB10 (T3-4) and JP3-7.  Solder joints under TP3 look OK.
With loop-back connection on TB7 through 10,  board passes complete STF suite at room temperature. 9/8/04
Probing and prodding restored continuity to JP3-7. 

Root cause:

Intermittant Trace problem.

Mitigation:

Green wire from TB10 to JP3-7 required.

Disposition:

If forensics don't destroy the board, then route into software testing.

Any Other Information:

Travler