Evan and Rick reported that the Test1 and Test2 On/Off switches were always on, no matter
what the MEDM switch setting was.

The corresponding output of the AI filter checked out okay at the end of the lilac coloured
cables, for both Test1 and Test2.

The output was checked at the end of the DB37 cable going into the TTFSS.  Although a change
in voltage was observed when both switches were toggled, the change for Test2 was not high enough
to trigger the MAX333 switch inside the TTFSS.  This was traced to a problem with the HCPL2231
optocoupler on the TTFSS fieldbox (D1100367).

Since we do not currently have any HCPL2231s, part N1 and N2 were swapped since part B of N2
was not used.  This has fixed the problem for now.



Jeff B, Evan, Peter