Hub SN-30 Trailer Sheet

11 MAY 2020
	- Begin work on Hub SN30 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.

15 MAY 2020
	- Completed final assembly of Hub SN30:
		- 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 #143
		- Powered on and configured DC/DC converters.
		- Programmed with safe/foundation firmware.
		- Installed minipods.
		  * NOTE: Took the minipods from SN12 for this Hub per Wade's instructions,
		    since none of our new Minipods have heat sinks yet.
		- 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	  40.0844  40.0734
		       320MHz	320.5	  40.0820  40.0757


		- Final voltage measurements as follows:
	  
    		 Power Bus:      FPGA     MGT     MGT    Swch    Bulk     Fan    Bulk    Vref    ISO_12V
       		                 Core    AVCC    AVTT     1V2     1V8     1V8     3V3
                       	         ----    ----    ----    ----    ----    ----    ----    ----    -------
       		   Address:       40      41      42      43      44      45      46
         	     Volts:     0.941    1.998   1.197  1.199   1.779   1.812    3.320
	              Amps:     1.000    0.000   0.312  1.750   0.500  11.812    1.812
	       Fluke Volts:     0.954    0.996   1.199  1.200   1.800   1.796    3.303   2.382    12.00

		- 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 ran in the 14SS in Slot #2 from 5/15 to 5/18. On 5/18 when I was going to run it in Slot #1,
		  SN29 stopped responding to Ping and any network communication. Also, all the network indicators
		  on the front of the card had gone dark.
		  Initial investigation shows that Switch1V2 is only putting out about half of it's intended voltage
		  (.650mV, approx.).

20 MAY 2020
		- Using an external supply to power the switch circuit, I've found that when the full 1.2V is applied,
		  current draw for just that circuit is about 750mA. That's with the rest of the board off and the
		  unit sitting idle on my bench. One or more of the switch chips is possibly drawing too much
		  current. Switch 'C' runs about 8F hotter than the other two, whether a fan is being used to
		  cool the board or not. It's possible that chip is no good.
		  To do a full I/O test and see if any of the switches work, I'll need to dig up another power supply 
		  for 3.3V.

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.
  
16 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.  

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.