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Shorting PIN for 100687658

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shahij

Post subject: Shorting PIN for 100687658

Posted: January 18th, 2014, 4:13

Joined: March 11th, 2008, 4:35
Posts: 1052
Location: Bangladesh

Hi,

Terminal locks on this one.

which pin to short to get access to Terminal please for the PCB?

100687658

This is the PIC http://www.drivestar.biz/seagate-100687658-p-2804.html

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fzabkar

Post subject: Re: Shorting PIN for 100687658

Posted: January 18th, 2014, 5:18

Joined: September 8th, 2009, 18:21
Posts: 16960
Location: Australia

If you are referring to shorting the read channel ...

Tip: How to identify the Read Channel test points:
http://malthus.zapto.org/viewtopic.php?f=24&t=123

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dataresc

Post subject: Re: Shorting PIN for 100687658

Posted: July 11th, 2014, 18:29

Joined: July 11th, 2014, 18:26
Posts: 1
Location: Greece

Hi Shahij,
I am facing exactly the same problem.
Have you managed to identify the pins for read channel?
Thank you in advance for your prompt reply!

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hhddrec

Post subject: Re: Shorting PIN for 100687658

Posted: July 14th, 2014, 4:00

Joined: August 13th, 2008, 13:10
Posts: 811
Location: World

shahij wrote:

Hi,

Terminal locks on this one.

which pin to short to get access to Terminal please for the PCB?

100687658

This is the PIC http://www.drivestar.biz/seagate-100687658-p-2804.html

Not good pic! can you send higth resolution one?

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fzabkar

Post subject: Re: Shorting PIN for 100687658

Posted: July 14th, 2014, 4:28

Joined: September 8th, 2009, 18:21
Posts: 16960
Location: Australia

http://ep.yimg.com/ay/yhst-444636922352 ... 7658-4.gif

Pins 12 - 18 of J4 are the read/write channel differential pairs. Measure the voltages at each of the pins to determine which is which. Do this with the board removed from the drive. There is a row of 4 corresponding through-holes on the other side of the PCB.

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