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 Post subject: Re: New Mrt User, please guide me How to Connect Wd Hard Dis
PostPosted: April 18th, 2019, 14:20 
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 Post subject: Re: New Mrt User, please guide me How to Connect Wd Hard Dis
PostPosted: April 18th, 2019, 17:26 
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Joined: September 8th, 2009, 18:21
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If this "BSY problem" persists, the following modification should make things easier:


Attachments:
MRT_WD_USB_modification.jpg
MRT_WD_USB_modification.jpg [ 297.46 KiB | Viewed 1102 times ]
HD3SS3412_SEL_definition.gif
HD3SS3412_SEL_definition.gif [ 13.87 KiB | Viewed 1102 times ]
HD3SS3412_block_diag.gif
HD3SS3412_block_diag.gif [ 18.51 KiB | Viewed 1102 times ]
HD3SS3412_switch_routing.gif
HD3SS3412_switch_routing.gif [ 23.06 KiB | Viewed 1102 times ]

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 Post subject: Re: New Mrt User, please guide me How to Connect Wd Hard Dis
PostPosted: April 18th, 2019, 18:03 
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Joined: November 29th, 2006, 10:08
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Location: UK
Thanks for your input.

I do understand the logic behind your suggestion and would like to try it, but struggling to locate a source of a small enough SMD SPST switch in small enough quantities.

Happy to try it for curiosity but don’t wanna spend too much!

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 Post subject: Re: New Mrt User, please guide me How to Connect Wd Hard Dis
PostPosted: April 18th, 2019, 20:25 
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Use an ordinary sized switch and run wires to the pads. No need for smt.

Image

If the PCB allows it, there may be a way to drill a hole to accommodate the switch, or you may be able to anchor it at one of the screw holes.

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 Post subject: Re: New Mrt User, please guide me How to Connect Wd Hard Dis
PostPosted: April 18th, 2019, 21:00 
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Joined: December 8th, 2010, 11:37
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pcimage wrote:
I do understand the logic behind your suggestion and would like to try it, but struggling to locate a source of a small enough SMD SPST switch in small enough quantities.

Happy to try it for curiosity but don’t wanna spend too much!

Farnell have all kinds of small switches you could buy for next to nothing and epoxy to the PCB.

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 Post subject: Re: New Mrt User, please guide me How to Connect Wd Hard Dis
PostPosted: April 18th, 2019, 21:40 
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Joined: September 8th, 2009, 18:21
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An alternative solution would be to short the pads of R3 with tweezers. This will pull the SEL pin high and disconnect both SATA pairs. This procedure should be safe, although inelegant. However, it would serve as proof of concept prior to embarking on any modifications.

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