From: Gordon K. <go...@gu...> - 2007-02-19 23:49:43
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Several Audiostix 2 and GPSstix boards of revision -R1286 (approximately 25 of each) slipped through testing and are non-functional and need to be repaired or replaced. Customers should contact sa...@gu... to arrange an RMA under warranty coverage. The products at issue are identified by the product name on the board (Audiostix II PCB00012-R1286) and by 2 blue resistors. An drawing showing the location of these 2 resistors is at: http://pubs.gumstix.com/boards/AUDIOSTIX/PCB00012-R1286/PCB00012.rework.png Those wish to do so may may field-correct this problem themselves by removing the two resistors from the boards. I sincerely regret the difficulties this has caused and I am examining our quality process to prevent a recurrence. Gordon Background: The power supply design was changed to allow an alternative version of the MIC5219 (the MIC5219ADJ instead of the MIC5219-3.3) that requires 2 resistors("R7" and "R8") to set the output voltage. A small number of boards were manufactured with the MIC5219-3.3, R7 and R8 all populated. To correct this R7 and R8 need to be removed. Schematics and layout are posted at: http://pubs.gumstix.com/boards/AUDIOSTIX/PCB00012-R1286 |
From: L R N. <lo...@lo...> - 2007-02-23 00:43:26
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> Several Audiostix 2 and GPSstix boards of revision -R1286 (approximately 25 of each) slipped through > testing and are non-functional and need to be repaired or replaced. Gordon, I believe I have one of the recent suspect GPSstix boards. I have carefully removed R7 & R8 from the board, alas still no output on ttyS2. > http://pubs.gumstix.com/boards/AUDIOSTIX/PCB00012-R1286/PCB00012.rework.png The photo/schematic you provided as a location reference for R7/R8 also shows a blue 'Connect GND' line. Does this need to be added to make things work? > Those wish to do so may may field-correct this problem themselves by removing the two resistors from the boards. > The power supply design was changed to allow an alternative version of the MIC5219 (the MIC5219ADJ instead > of the MIC5219-3.3) that requires 2 resistors("R7" and "R8") to set the output voltage. > A small number of boards were manufactured with the MIC5219-3.3, R7 and R8 all populated. > To correct this R7 and R8 need to be removed. As a check, I have a "5219 3.3Y" chip on the board, and your instructions indicate that when using the 5219 3.3" chip you DO NOT need R7/R8. (hope I'm reading this right!) Mike Halderman may also have this issue, as he's been posting lately with almost identical issues. (no data from ttyS2 at all) I've followed along with the troubleshooting methods posted in reference to Mike's issue, all with no results. Thank you. Loni lo...@lo... |
From: mike h. <mr...@gm...> - 2007-02-23 01:40:17
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Hi Loni, I tested that grounding one side of the board to the other powers up the gps module and it works fine. Just a few minutes ago I added a small wire from the NSSP gnd to one of the gps antenna ground legs and all is working. Thank you Gordon for solving this problem. -mike On 2/22/07, L R Nix <lo...@lo...> wrote: > > > Several Audiostix 2 and GPSstix boards of revision -R1286 > (approximately 25 > of each) slipped through > > testing and are non-functional and need to be repaired or replaced. > > Gordon, I believe I have one of the recent suspect GPSstix boards. I have > > carefully removed R7 & R8 from the board, alas still no output on ttyS2. > > > http://pubs.gumstix.com/boards/AUDIOSTIX/PCB00012-R1286/PCB00012.rework.png > > > The photo/schematic you provided as a location reference for R7/R8 also > shows a > blue 'Connect GND' line. Does this need to be added to make things work? > > > Those wish to do so may may field-correct this problem themselves by > removing > the two resistors from the boards. > > > The power supply design was changed to allow an alternative version of > the > MIC5219 (the MIC5219ADJ instead > > of the MIC5219-3.3) that requires 2 resistors("R7" and "R8") to set the > > output voltage. > > A small number of boards were manufactured with the MIC5219-3.3, R7 and > R8 all > populated. > > To correct this R7 and R8 need to be removed. > > As a check, I have a "5219 3.3Y" chip on the board, and your instructions > indicate that when using the 5219 3.3" chip you DO NOT need R7/R8. (hope > I'm > reading this right!) > > Mike Halderman may also have this issue, as he's been posting lately with > almost > identical issues. (no data from ttyS2 at all) > > I've followed along with the troubleshooting methods posted in reference > to > Mike's issue, all with no results. > > Thank you. > > Loni > lo...@lo... > > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share > your > opinions on IT & business topics through brief surveys-and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: Craig H. <cr...@gu...> - 2007-02-23 01:59:50
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On Feb 22, 2007, at 4:43 PM, L R Nix wrote: > The photo/schematic you provided as a location reference for R7/R8 > also shows a > blue 'Connect GND' line. Does this need to be added to make things > work? That wire needs to be added for the GPS to work (and for better grounding across the board). C |
From: L R N. <lo...@lo...> - 2007-02-23 05:31:17
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{Chuckle} Adding that wire was like pulling the headphone plug out of the stereo.... the little GPS unit just took off!! woo hoo! Thank you thank you. Loni On Thu, 22 Feb 2007, Craig Hughes wrote: > Date: Thu, 22 Feb 2007 17:59:44 -0800 > From: Craig Hughes <cr...@gu...> > Reply-To: General mailing list for gumstix users. > <gum...@li...> > To: General mailing list for gumstix users. > <gum...@li...> > Subject: Re: [Gumstix-users] Audiostix2 and GPSstix boards of revision -R1286 > Product Alert > > On Feb 22, 2007, at 4:43 PM, L R Nix wrote: > > > The photo/schematic you provided as a location reference for R7/R8 > > also shows a > > blue 'Connect GND' line. Does this need to be added to make things > > work? > > That wire needs to be added for the GPS to work (and for better > grounding across the board). > > C > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys-and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |