Powerboard TS-7500

46 ... no DRCs 100% completion, components not yet re-numbered

47 ... components renumbered, looks good
       gerbs to freedfm.com
       no show stoppers
       pulled trigger

9.Mar.2010  Board out for fab

       TS7500 should have been rotated 180 degrees on the Carrier board, which affects
       the power connector placement

LESSONS LEARNED

       make a solid model and do a design review as soon as parts are placed
       on future PCBs

       Our "standard" has pin 1 as GND.  J4 thru J9 all have pin 2 as GND.

30.Mar.2010 S/N 001 Check out notes

       Bus input voltage set to 30, no load on power supplies

       F1 and F2 out
         0 current draw

       F1 only installed ( 5V CPU supply )
         0.02 Amp draw

       F2 only installed ( 12V INST supply )
         0.14 Amp draw
         Betadyne data sheet calls out 0.08 Amp draw no-load
         Removed D1 ( 14V transorb ), still 0.14 Amp draw

       F1 and F2 installed
         0.15 Amp draw

       Carrier board installed
         0.16 Amp draw

       TS-7500 installed
         0.24 Amp draw

       Using electronic load, set 6.0 Amp draw onto 12V Inst, Betadyne will not turn on,
       but the CPU boots ( Ethernet OK, no console serial - RS232 power derived from 12V Inst )

       5 Amp load, 12V Inst will not turn on, CPU boots
 
       4 Amp load, 12V Inst will not turn on, CPU boots
 
       3 Amp load, 12V Inst OK, CPU boots, serial console working
       
31.Mar.2010
       
       Hans: Bypass all Betadyne input filtering, check quiescent current draw

                ( this was no help )

             Install 0.1 uF cap on Vadj terminal on Betadyne output

                ( this had no effect )

       Betadyne published REV 2 of the Q75 spec sheet; quiescent draw now spec'd at 0.160 Amps