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Spinal
 Post subject: Short pins Seagate ST4000DM004 - 100815595
PostPosted: May 20th, 2024, 7:30 
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Location: Minsk
Hello. To access the terminal i need to make a short pins in this PCB, but i don't know which ones exactly.


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fzabkar
 Post subject: Re: Short pins Seagate ST4000DM004 - 100815595
PostPosted: May 20th, 2024, 15:33 
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What voltages do you measure between ground and each of the 4 HDA pads when the PCB is on and off the drive?

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Spinal
 Post subject: Re: Short pins Seagate ST4000DM004 - 100815595
PostPosted: May 21st, 2024, 6:11 
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fzabkar wrote:
What voltages do you measure between ground and each of the 4 HDA pads when the PCB is on and off the drive?


PCB is off the drive

    A1 = 1.37V ; B1 = 0.68V
    A2 = 1.37V ; B2 = 1.02V
    A3 = 0.03V ; B3 = 3.22V
    A4 = 0.03V ; B4 = 0V
    A5 = 0V ; B5 = 1.76V
    A6 = 5.18V ; B6 = 0V
    A7 = 0V ; B7 = 0V
    ------------- ; B8 = 0V
    ------------- ; B9 = 0V

PCB is on the drive

    A1 = 1.75V ; B1 = 6.04V
    A2 = 1.75V ; B2 = 6.00V
    A3 = 0.98V ; B3 = 2.23V
    A4 = 0.98V ; B4 = 1.51V
    A5 = 0V ; B5 = 1.76V
    A6 = 5.18V ; B6 = 0V
    A7 = 2.96V ; B7 = 0V
    ------------- ; B8 = 1.76V
    ------------- ; B9 = 0.03V


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fzabkar
 Post subject: Re: Short pins Seagate ST4000DM004 - 100815595
PostPosted: May 21st, 2024, 10:56 
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The write channel would be driven by the MCU whereas the read channel would be driven by the preamp. Therefore, I believe that A3/A4 is the read channel pair (because it sits at 0.03V when the preamp is not connected).

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Spinal
 Post subject: Re: Short pins Seagate ST4000DM004 - 100815595
PostPosted: June 10th, 2024, 1:26 
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Joined: May 20th, 2024, 6:28
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Location: Minsk
fzabkar wrote:
The write channel would be driven by the MCU whereas the read channel would be driven by the preamp. Therefore, I believe that A3/A4 is the read channel pair (because it sits at 0.03V when the preamp is not connected).


Thanks for your reply, I'll try.
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