Hub SN-28 Trailer Sheet

24 APR 2020
	- Begin work on Hub SN28 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.

01 MAY 2020
	- Completed final assembly of Hub SN28:
		- 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 #139
		- 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	 40.032	  40.0848  40.0731
		       320MHz	320.5	  40.0818  40.0755


		- 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:     0.938    0.966   1.199  1.206   1.796   1.819    3.310
	              Amps:     0.0875   0.188   0.125  1.688   0.625  11.812    1.625
	       Fluke Volts:     0.955    0.999   1.201  1.198   1.798   1.795    3.309

		      Vref:     2.381V
		   ISO_12V:    12.00V

		- Removed IPMC bypass (yellow wire) after testing. IPMC module now has direct control of ISO_12V supply.
		- Flashed IPMC module with current binaries. Address is now in the 10 subnet. Logfile in folder.
		- Unit has been placed in the storage cabinet to wait for its turn in the 14SS.

19 MAY 2020
		- Unit first went into the 14SS on 15 MAY 2020. I found that the IPMC module is not turning on the
		  12V supply when unit is put into the rack. With the IPMC bypass installed, the unit comes up
		  normally, all power supplies are on and have good output, and I was able to complete the final
		  bench checks and program the IPMC.
		  I've thus far verified the handle switch, the installed wiring, the connection from WTERM72 through
		  a 100 Ohm resistor to 3.3V, and from WTERM71 all the way to Pin 224 on the IPMC socket. I then followed 
		  from IPMC Pin 225 (Payload enable) to 0 Ohm JMP5, 330 Ohm R956, and the optocoupler OPT1. I tend
		  to discount these components as the issue, anyways, since the board does power up fine when the 
		  bypass is installed at JMP5.
		  Further investigation will be needed. For now, the IPMC bypass is installed so that the unit
		  can be tested. Possibly, it will join the ranks of the other "special" cards.
		  
13 JUL 2020
	- Unit's IPMC issue has been solved. It appears that a bad solder joint on one of the IPMBus clock lines
	  was the root of the issue. 
	- Details in Trailer Addendum file and IPMC Tests folder.
	
05 AUG 2020
- This hub got all of it's problems from the flux used on many of the installed components. See
  l1calo/hub/hardware/details/Hub_Inventory_Status_Final_Assembly/FluxProblemOnHubs.txt 
  for details.
  
  This note is to confirm that this Hub has been cleaned with G3 flux remover.

15 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.

03 FEB 2021
- This Hub has been mated with ROD #14.

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.