[Elecraft] Re: Elecraft ECO 00507 K3 DSP PCB BOM Changes to MakeProduction Rev B1 (Attachments)

[Ed Muns]

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: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] 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 ====
> >
> 
> ---
> 
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> 
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