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Is This The Read Channel?

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ddrecovery

Post subject: Is This The Read Channel?

Posted: January 15th, 2015, 13:37

Joined: June 11th, 2013, 17:01
Posts: 1773
Location: Phoenix, AZ USA

I have tried testing this board to define the read channel but the tests are inconclusive. I have marked what I presume is the read channel, can anyone confirm?

ST31500541AS
Board 100535537 REV A

Attachments:

Read_C.jpg [ 205.35 KiB | Viewed 7282 times ]

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lcoughey

Post subject: Re: Is This The Read Channel?

Posted: January 15th, 2015, 14:34

Joined: February 9th, 2009, 16:13
Posts: 2592
Location: Ontario, Canada

Looks right to me...or the two just down to the left in the photo.

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Luke
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ddrecovery

Post subject: Re: Is This The Read Channel?

Posted: January 15th, 2015, 14:46

Joined: June 11th, 2013, 17:01
Posts: 1773
Location: Phoenix, AZ USA

lcoughey wrote:

Looks right to me...or the two just down to the left in the photo.

Its deciding which one of those two sets I am having issues with

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data-medics

Post subject: Re: Is This The Read Channel?

Posted: January 15th, 2015, 16:27

Joined: April 3rd, 2011, 0:19
Posts: 2003
Location: Providence, RI

I think you have the right two highlighted, the other set looks like it goes to the preamp which wouldn't make much sense.

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ibcho

Post subject: Re: Is This The Read Channel?

Posted: January 15th, 2015, 16:42

Joined: June 30th, 2008, 5:40
Posts: 64

you got it right mate

I've had same one a few weeks ago and I used the same pins

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ddrecovery

Post subject: Re: Is This The Read Channel?

Posted: January 15th, 2015, 16:50

Joined: June 11th, 2013, 17:01
Posts: 1773
Location: Phoenix, AZ USA

Thanks everyone

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fzabkar

Post subject: Re: Is This The Read Channel?

Posted: January 15th, 2015, 17:10

Joined: September 8th, 2009, 18:21
Posts: 17215
Location: Australia

My tutorial shows you how to distinguish between the read and write pairs with a simple voltage measurement.

How to identify the Read Channel when no terminators:
http://www.alexsoft.org/viewtopic.php?f=24&t=123&p=1632

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ddrecovery

Post subject: Re: Is This The Read Channel?

Posted: January 15th, 2015, 19:37

Joined: June 11th, 2013, 17:01
Posts: 1773
Location: Phoenix, AZ USA

fzabkar wrote:

My tutorial shows you how to distinguish between the read and write pairs with a simple voltage measurement.

That is always my go to link to test these boards. But for some reason I was getting no voltage at all from the channels. I have another board I will test/compare it against tomorrow.
Thanks

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fzabkar

Post subject: Re: Is This The Read Channel?

Posted: January 16th, 2015, 17:32

Joined: September 8th, 2009, 18:21
Posts: 17215
Location: Australia

data-medics wrote:

the other set looks like it goes to the preamp which wouldn't make much sense.

Why not? Where do they go, then, if not to the preamp?

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