Hubble ACS Fixed
Hubble Space Telescope Advanced Camera for Surveys (ACS) Status Report #2
“Early on October 9 engineers sent commands to Hubble Space Telescope to toggle the suspect relay. Telemetry confirmed that the relay cycled open and closed as expected. Engineers determined this action succeeded in restoring the HRC at 5:40 am on October 9 during the first opportunity to restore power to the +35V bias line. Since this test was fully successful, further workarounds will not be required. NASA engineers believe the cause of the open circuit was a tiny particle of dust or fabric physically interfering with the electrical contact.”