Wrong reflector, Wayne. I don't think any of us are expected to understand this, but it's nice to know engineering and production are working well together at getting K3s out the door. ;>)
73, Ed - W0YK > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of wayne burdick > Sent: Tuesday, 20 November, 2007 14:41 > To: Eric Swartz; Elecraft Reflector; Brian Broggie; Gary Surrency > Subject: [Elecraft] Re: Elecraft ECO 00507 K3 DSP PCB BOM > Changes to MakeProduction Rev B1 (Attachments) > > Brian, just a note that crystal spacers are *not* needed on > the RF board, synth, REF oscillator, and crystal filter > modules. I shrink the exposed pad area in all my designs on > the top side of the board so the crystal can't short to the > pad. Solder mask is an excellent insulator. > > tnx > W > > On Nov 20, 2007, at 2:33 PM, Brian wrote: > > > ECO Number: 00507 K3 DSP PCB BOM Changes to Make > > Production Rev B1 > > Date submitted: 11/20/2007 > > Originator: Brian Broggie > > > > Attention: Wayne B., Lyle J., Bob F., Eric S., Group7, > > Synergetics > > > > EPN's Affected: E850233 K3 DSP PCB BOM > > > > Applicability: Applicable immediately to all assemblies for > > E100234 DSP PCB rev B. > > > > Special instructions: > > > > Please make the following changes to > BOM E850233: > > > > > > Add E700155 "Mylar Insulator for Xtals" (add ref > > HDWR) > > set Qty to 1. Vendor is DigiKey Part # > > 492-1039-ND. > > > > > > Reason for change: Prevents Y1 from shorting leads to ground. > > > > > > <E850233-B1 K3 DSP BOM.xls>Assembly: E850233 K3 DSP PCB > Assembly This > > Document Rev: D > > Last Revised: 11/20/2007 > > Revised By: B. Broggie > > > > > > Connectors P31 and P32 are installed on the component (top) side of > > the PCB. > > > > Connectors J1, J52, J53, and J54 are installed on the > component (top) > > side of the PCB. > > > > Connectors J50 and J51 are installed on the solder bottom > side of the > > PCB. These are the *only* parts installed on the bottom > side of the > > PCB. > > > > Connectors P57 and P59 are not installed. > > > > The holes for P57 must be kept free of solder! > > > > Pins 17, 18, 19 and 20 of J51 must be trimmed FLUSH to the > PCB before > > soldering, and inspected post-solder to ensure proper wicking of > > solder. There mus be no more than 0.005" of pin extending past the > > surface of the PC board. This is to ensure there is no shorting > > between pins of the VFO-B encoder PCB on the FP board and > pins of J51 > > on the DSP board. > > > > > > 1 3 5 7 9 11 13 15 > > > > o o o o o o o o > > ------------------------ > > o o o o o o o o > > > > 2 4 6 8 10 12 14 16 > > > > > > > > > > Y1 requires a grounding wire from the case to the ground pad just > > above it. > > > > There are no removed male pins (polarizing) or insterted female pin > > blocks (polarizing) on this PCB assembly. > > > > Ensure the J1 headphone jack is mounted square to the > surface of the > > pc board. > > > > > > > > ******************************* > > New this rev: > > > > Insert a nylon insulator under Y1 prior to inserting > it onto the > > PCB. > > > > ******************************* > > > > > > > > > > ==== End ==== > > > > --- > > http://www.elecraft.com > > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
