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Re: Powering Sony MZ-NH900 with 4.8 volts

Subject: Re: Powering Sony MZ-NH900 with 4.8 volts
From: "Rob Danielson" danielson_rob
Date: Tue Jan 23, 2007 9:27 am ((PST))
At 4:56 PM +0000 1/23/07, John Hartog wrote:
>Rob,
>
>Before you buy one:  There is a service manual for the rh10 at
>minidisk.org.
>
>http://www.minidisc.org/manuals/sony/service/MZ_RH10_sm.pdf

Thanks! A "group buy" special for all of us.

Lower Right Page 23. No converter before the "Charge Controller" 
section that I can see. USB Power In disrupts +V from the DC input. 
Isn't USB 5 volts? If so, looks like 4.8V is okay to me. Maybe 
someone one could take a look. Rob D.


>
>I haven't had time to weed through it yet.
>
>John Hartog
>
>
>
>--- In  Rob Danielson <> wrote:
>>
>>  One would think problems would have surfaced by now. A Service Manual
>>  with schematic might help determine what is in the power adapter DC
>>  input circuit.  Here's one for the mz-nh700
>>
>https://www.manualsparadise.com/ShowProductsForModel.do;jsessionid=B35307F42D98FA3573E9EAB0D907AE5E?source=esi&target=mznh700&model=M74876374
>>
>>  I'll see if the tech dept wants to order one. Rob D.
>>
>>
>>  At 6:59 AM +0000 1/23/07, John Hartog wrote:
>>  >Phil,
>>  >Now rereading your original post, I see I overlooked you mentioning
>>  >measuring 3.5 V on your power adapter.  So I went back and remeasured
>>  >mine.  The one I originally measured at 5.1V (model AC-ES305)I think
>>  >came with my older MZ-N707 MD (not a HiMD). The one that came with the
>>  >HiMD RH10 (AC-ES3010K2) measures 3.4V, and the one that was supplied
>>  >supplemental to the MZ-NH700 (AC-E30A) measured 3.3V.
>>  >
>>  >I was making my assumptions about HiMD powering based on an older
>>  >power supply, and I appologize for steering anyone wrong.
>>  >
>>  >John Hartog
>>  >
>>  >
>>  >--- In  "macmang4125"
>>  ><macmang4125@> wrote:
>>  >>
>>  >>  Looking at Rob Danielson's excellent site I saw John Hartog's
>4.8 volt
>>  >>  sled. Before I go and plug 4.8 volts into my NH900 I would like
>>  >>  reassurance that this is OK. As measuring the volts out of the power
>>  >>  supply they are 3.5 volts, the extra 1.3 volts should not be a
>>  >>  problem. But I would hate for them to be my 'famous last words' :-))
>>  >>
>>  >>  Phil
>>  >>
>>  >
>>  >
>>  >
>>  >
>>  >"Microphones are not ears,
>>  >Loudspeakers are not birds,
>>  >A listening room is not nature."
>>  >Klas Strandberg
>>  >Yahoo! Groups Links
>>  >
>>  >
>>  >
>>
>>
>>  --
>>  Rob Danielson
>>  Peck School of the Arts
>>  University of Wisconsin-Milwaukee
>>  http://www.uwm.edu/~type/audio-art-tech-gallery/
>>
>>
>>
>
>
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links
>
>
>


-- 
Rob Danielson
Peck School of the Arts
University of Wisconsin-Milwaukee
http://www.uwm.edu/~type/audio-art-tech-gallery/





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