marc.pirello@LIGO.ORG - posted 16:30, Monday 24 April 2023 (68958)
PSL-R2 aka ISC-R4 power supply replaced
The -18V power supply located in the Power Mezanine above the CER in rack C5 slot U13-U15 on the Right Hand Side (RHS) was measured over 130F+ from the front of the supply. This is indicative of a failed fan, so this supply was pulled and replaced. We took the opportunity to do this due to the earthquake.
Old Supply S1201952 was set to -18.97V
New Supply S1201930 was set to -18.93V
We used the sequencer aboev the rack ISC-R4 to make sure that we did not damage any low noise power boards.
We noted that the power supply is routed to the junction box above PSL-R2 and then jumps across to power ISC-R4.
M. Pirello, F, Mera