Hub SN-22 Trailer Sheet

02 MAR 2020
	- Begin work on Hub SN22 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: When making my first attempt at final bench checks on SN22, I couldn't get a 1.8V readout at J3. Also, the PLLs wouldn't lock. Investigation led me to R2357 coming off of DC/DC7. Its value is given as 100 Ohms in mentor comps, but it was millions of Ohms in-circuit, and wide-open out. Replaced it with a 100 Ohm 0603 I had on hand and re-tested the board. Board conformed to specs after that.

09 MAR 2020
	- Completed final assembly of Hub SN22.
	- Work conformed to given instructions.
		- Installed RC filter components on MGT_AVCC, MGT_AVTT, and Fan_1V8 supplies.
		- Installed discrete power wires.
		- Installed light pipes and front panel.
		- Installed IPMC module #195
		- Powered on and configured DC/DC converters.
		- Programmed with safe/foundation firmware.
		- Installed minipods.
		- Installed MPOs.
		- Installed FPGA heat sink.
		- Installed fiber ribbons and clipped to side of heat sink.
		- Verified 25MHz, 40MHz, and 320MHz clocks with oscilloscope:

			PLL	Free Run  Hi-Lock  Lo-Lock
			------	--------  -------  -------
			40MHz	 40.09	  40.0844  40.0729
		       320MHz	320.7	  40.0819  40.0752


		- 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:     0.95     1.00    1.19   1.20    1.78    1.80     3.303
	              Amps:     1.38     0.38    0.25   1.69    0.44   12.19     1.625
	       Fluke Volts:     0.952    1.00    1.199  1.197   1.800   1.795    3.306

		- 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 confirm that this hub has been through the component replacement process
  described at the bottom of the file at the above link.

23 SEP 2020
- This Hub has been mated with ROD V4 SN06.

11 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.