From: Marc Postman (postman@stsci.edu)
Date: Tue Jun 20 2006 - 13:40:46 PDT
Begin forwarded message:
> At an ACS Suspend Status Meeting and telecon today at 1:00 pm EDT,
> a review of the telemetry and technical details about possibly
> affected components of ACS was presented. However, the root cause
> for the ACS suspend that occurred yesterday is still unknown.
> Further analysis and testing revolves around low-voltage power
> supplies as well as analog to digital converters. Analysis of ACS
> images taken before the suspend event shows no anomalies of any kind.
>
> The further course of action will simultaneously prepare for
> further testing of the Side 1 electronics, which has been used
> since the installation of ACS, while preparing for a potential
> switch to the Side 2 electronics. The Side 1 tests will commence
> later this week, after an intercept SMS without any ACS commanding
> begins executing on Thursday morning, and after verification that
> the tests will not harm the instrument. These tests will check
> various registers and voltages to pin down the location of the
> cause for the suspend. In addition, an SMS without ACS for next
> week will be prepared as well.
>
> Preparations for a switch to Side 2 involve procedure verification,
> Flight Software changes, as well as the definition of calibration
> and verification programs to be executed before the full ACS
> science program could hopefully continue. A switch to Side 2 could
> come as early as next week.
>
> The next ACS Suspend Status Meeting is scheduled for Thursday. We
> will provide further updates after that, or earlier, if more
> information becomes available.
>
> Helmut
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