Hubble Telescope's Main Camera Not Working

The exact cause of the problem and a potential fix were under investigation, the statement said. The other two cameras were still operating and engineers were hopeful the problem could be fixed from the ground, an agency scientist said.

Telescope should be working by July 3

A NASA board will meet Thursday at the Goddard Space Flight Center to determine how to deal with power problems that have shut down the Advanced Camera for Surveys. Engineers "anticipate instrument observations will resume no earlier than July 3, with no degradation to performance," the NASA statement said.

Ed Ruitberg, deputy associate director of the Astrophysics Division at Goddard, said NASA engineers believe they are "very close to fully understanding the issue experienced with the camera and we are going to resolve it."

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Ground controllers received indications June 19 that voltage readings on the camera's power supply were outside of their acceptable range, causing the camera to shut down. The camera was taken off line while the problem is being studied, although other instruments on board the orbiting observatory continue to function.

NASA officials have said a bad transistor may be responsible for the voltage problems.

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