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Subject: Re: Dead JBM 20
From: jhagani_at_earthlink.net
Date: 2004-08-23


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

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