Hub SN-20 Trailer Sheet 11 FEB 2020 - Begin work on Hub SN20 per instructions at /hub/hardware/details/Hub_Inventory_Status_Final_Assembly/hub_msu_final_assembly_prod_only_print.txt - Check GND/ESD continuity - Verify power supply resistances to GND - Preliminary mechanical work - mounting blocks, removing runners, etc. - Begin component R&R. NOTE: During my initial inspection, I found two pins on connector J3 bridged on the bottom side of the Hub board. Some solder was also splashed onto Pins 1-2 of IC U554. I cleaned up the poor solder work on the connector and re-soldered IC U554. Before/after photos placed in file folder. 21 FEB 2020 - Completed final assembly of Hub SN20 - Work conformed to given instructions. - Installed discrete power wires. - Installed IPMC module #196 - Installed LRC filter components on MGT_AVCC, MGT_AVTT, and Fan 1V8 supplies. - Installed minipods. - Installed FPGA heat sink. - Installed MPOs. - Installed fiber ribbons and clipped to side of heat sink. - Powered on and configured DC/DC converters. - Programmed with safe/foundation firmware. - Verified 25MHz, 40MHz, and 320MHz clocks with oscilloscope: PLL Free Run Hi-Lock Lo-Lock ------ -------- ------- ------- 40MHz 40.078 40.0819 40.0730 320MHz 320.6 40.0814 40.0754 - Final voltage measurements as follows: Power Bus: FPGA MGT MGT Swch Bulk Fan Bulk Core AVCC AVTT 1V2 1V8 1V8 3V3 ---- ---- ---- ---- ---- ---- ---- Address: 40 41 42 43 44 45 46 Volts: 0.93 1.00 1.18 1.20 1.79 1.81 3.314 Amps: 1.25 0.19 0.00 1.69 0.44 11.69 1.688 Fluke Volts: 0.955 1.001 1.195 1.199 1.798 1.794 3.311 - Removed IPMC bypass (yellow wire) after testing. IPMC module now has direct control of ISO_12V supply. - Unit has been placed in the storage cabinet to wait for its turn in the 14SS. 24 APR 2020 - Powered unit up on bench to update IPMC firmware. 06 AUG 2020 - This note is to confirm that this Hub has been cleaned with G3 flux remover. See l1calo/hub/hardware/details/Hub_Inventory_Status_Final_Assembly/FluxProblemOnHubs.txt for details. 09 SEP 2020 - This note is to comfirm that this Hub has been through the component replacement process as described at the bottom of the file at the above link. 11 SEP 2020 - Hub 20 has passed EQ On/Off testing and is now ready to be mated with a ROD. 23 SEP 2020 - This Hub has been mated with ROD V4 SN04. 10 DEC 2020 - This Hub had to be removed from 14SS because its ROD was not responding to Ping. ROD #04 is being tested on the bench to see if there's a hardware problem with it. 11-18 DEC 2020 - ROD #04 is not responding to ping while installed in the shelf. I've removed the ROD and conducted various tests on both Hub and ROD. I see no electrical reason why the ROD wouldn't respond. I've verified all the connections and traces from the ROD's RJ45 all the way on to the card, right up to its Phys chip. Interestingly, when this ROD is flashed with appropriate FW, it causes LED lighting and/or 'A' Switch chip faults on the Hub. This board combo behaves the same, whether it is in Slot #1 or #2. HW Monitor says all the supplies are good on both Hub and ROD when it is powered and programmed and exhibiting this behavior. - Next test will be to mate a different ROD to this Hub and determine if the problems seen are because of the Hub or because of the ROD itself. DEC 2020 through JAN 2021 - This Hub had ROD #12 installed and went into the shelf, where it performed as expected. - ROD #04 ended up being the problem with the pair, and will have its own trailer sheet. 06 MAY 2021 - This is a note to confirm that the board has been through the fiber ribbon replacement. See hub/hardware/details/Hub_Inventory_Status_Final_Assembly/Fiber%20Ribbon%20Problem/00_Hub_Fiber_Ribbon_Issue.txt for details.