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Rockbox mail archiveSubject: Re: Dead JBM 20Re: Dead JBM 20
From: Markus Grebenstein <sassodimorte_at_gmx.de>
Date: Mon, 23 Aug 2004 18:38:09 +0200 I'm not an electronic- expert two =-( You have to place one lead on the case and one on 41 to check Logic- DC or 42 to check Motor- DC. To find which is 41/42 two just check your HD. Normally pin 1 is marked somewhere (on mine there's a sticker applied). The pins are numbered with all even pins on top or on bottom (2,4,6,8..... next to each other). Cheers, Markus jhagani_at_earthlink.net schrieb: > Markus: > > I'm not quite sure how I go about checking the voltage on the pins > (i'm a relative electronics novice): > > Am I right to assume that I should take my multimeter, find the back > of the PCB where the ATA connector resides (on my JBR v.1, it says > MP3REAR-8.3), place one lead on pin 41 and other other on 42 and > measure voltage - then repeat with HD removed? > > If so, could you help me locate which are the pins 41/42? > > Thanks, > > Jim (8 days and counting since my JBR went R.I.P....) > > ------------------------------ > > On Mon, 23 Aug 2004 15:52:21 +0200, you wrote: > > >>Probably same problem as mine. Check voltage on pin 41 and 42 of ATA. >>You have to measure with the HD disconnected and connected. On my unit >>voltage goes down to 1.8V when the HD tries to spin up. Sadly I still >>haven't found (what I'm looking for *g*) the bad guy on the pcb. Sadly >>the schemes don't fit exactly to my JBS 20. >> >>Linus Nielsen Feltzing schrieb: >> >> >>>jhagani_at_earthlink.net wrote: >>> >>> >>>>Linus: >>>> >>>>Thank you for the suggestion - I had examined the battery connections >>>>per that URL - they looked fine but I reinforced them anyway - >>>>unfortunately, all to no avail. I also tried a different, fresh set >>>>of batteries, but that too did not help. >>> >>> >>>Hmmm. Can you measure the voltage on the HD? Check the ATA specification >>>for the pinout. >>> >>>However, I suspect you will see 5V, but there isn't enough current to >>>start the drive... >>> >>>Linus >>>_______________________________________________ >>>http://cool.haxx.se/mailman/listinfo/rockbox >>> >> >>_______________________________________________ >>http://cool.haxx.se/mailman/listinfo/rockbox > > > > _______________________________________________ > http://cool.haxx.se/mailman/listinfo/rockbox > -- | Markus Grebenstein | | Adalbertstrasse 88 80799 Muenchen | | Tel.: 089/62509834 Fax.: 089/1488-269718 | _______________________________________________ http://cool.haxx.se/mailman/listinfo/rockboxReceived on 2004-08-23 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |