Posted on 07/15/2021 12:17:40 PM PDT by Red Badger
NASA has identified the possible cause of the payload computer problem that suspended Hubble Space Telescope science operations on June 13. The telescope itself and science instruments remain healthy and in a safe configuration.
The payload computer resides in the Science Instrument Command and Data Handling (SI C&DH) unit. It controls, coordinates, and monitors Hubble’s science instruments. When the payload computer halted, Hubble’s science instruments were automatically placed into a safe configuration. A series of multi-day tests, which included attempts to restart and reconfigure the computer and the backup computer, were not successful, but the information gathered from those activities has led the Hubble team to determine that the possible cause of the problem is in the Power Control Unit (PCU).
The PCU also resides on the SI C&DH unit. It ensures a steady voltage supply to the payload computer’s hardware. The PCU contains a power regulator that provides a constant five volts of electricity to the payload computer and its memory. A secondary protection circuit senses the voltage levels leaving the power regulator. If the voltage falls below or exceeds allowable levels, this secondary circuit tells the payload computer that it should cease operations. The team’s analysis suggests that either the voltage level from the regulator is outside of acceptable levels (thereby tripping the secondary protection circuit), or the secondary protection circuit has degraded over time and is stuck in this inhibit state.
The Hubble Space Telescope is deployed on April 25, 1990 from the space shuttle Discovery. Avoiding distortions of the atmosphere, Hubble has an unobstructed view peering to planets, stars and galaxies, some more than 13.4 billion light years away. Credit: NASA/Smithsonian Institution/Lockheed Corporation
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Because no ground commands were able to reset the PCU, the Hubble team will be switching over to the backup side of the SI C&DH unit that contains the backup PCU. All testing of procedures for the switch and associated reviews have been completed, and NASA management has given approval to proceed. The switch will begin Thursday, July 15, and, if successful, it will take several days to completely return the observatory to normal science operations.
The team performed a similar switch in 2008, which allowed Hubble to continue normal science operations after a Command Unit/Science Data Formatter (CU/SDF) module, another part of the SI C&DH, failed. A servicing mission in 2009 then replaced the entire SI C&DH unit, including the faulty CU/SDF module, with the SI C&DH unit currently in use.
Launched in 1990, Hubble has been observing the universe for over 31 years. It has taken over 1.5 million observations of the universe, and over 18,000 scientific papers have been published with its data. It has contributed to some of the most significant discoveries of our cosmos, including the accelerating expansion of the universe, the evolution of galaxies over time, and the first atmospheric studies of planets beyond our solar system.
Just send Story Musgrave up in a Shuttle to swap out the defective computer.
Oh, wait...
Russian hackers?
More likely a semiconductor failed..............
Elon can fix it, either that or social workers
Windows Update screwed it up. :^)
They used the Windows ME edition....................
Not the first time a power supply was the weak link.
Tell senile Biden that the telescope has NOT been vaccinated
He will then order the Space Command to make a house call. While there, they can get Musgrove to swap out the computer.
Hillary’s email server? Dominion voting system counting software? CDC COVID tracking multiplier?
I guess that it was running Windows 10 and all they had to do when they got the Black Screen of Death was to reboot and reload the operating system from scratch.
Extension cord wasn’t long enough?
In the future leave your computers on the ground and control what ever it is from there ,LOL
And reformat the hard disk.
Racism!
Someone forgot to set a watchdog timer maybe...
/s (at least I hope it’s just sarcasm)
Redundancy.
Gotta have it, especially in this kind of environment.
Tough to get a tech to make a house call. Hope it works.
This thing has lasted longer than anyone could have hoped for.
I keep telling my techs not to strap a 300w P/S to a mobo rated for 450w, but do they listen? Noooooooo........
Overkill is no vice when it comes to selecting a switching supply.
Conversely, you haven’t lived until you’ve cracked the case on a tower and seen what an overrated P/S gone mad can do to the caps on the board. Cooked electrolyte all over the place.
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