WANTED: Seagate 7200.8 400gb HDD Contoller PCB
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Author:  Waltheof [ January 15th, 2021, 11:43 ]
Post subject:  WANTED: Seagate 7200.8 400gb HDD Contoller PCB

Hi, All,

I have a Seagate 7200.8 that is not spinning. I have continuity checked the diodes on the board, and none are shorting - and that is about the limit of my expertise. The power is on; the head tries to 'track' on the platter, but is prevented by the air-operated 'safety-catch', which appears to operated by the airflow from the spinning disks, and so it just click-click-clicks against the catch. The heads are moveable, and so is the platter-stack, so nothing is seized.

What I want to do is to swap out the PCB (where I believe the problem to be) for a replacement so that I can recover the data.

To that end, does anyone one out there have (or know where I might obtain) a controller PCB for;

Seagate Barracuda 7200.8 400GB
Model no. ST3400832A
Part no. 9Y7485-066
Firm ware 3.03
Date code 06135
Site Code TK

Any help would be really appreciated. I know it is an old HDD (and would normally be written off), however there are many 'brownie-points' to be earned with a very cute girl :wink: :lol:

Cheers for your time


Author:  pepe [ January 15th, 2021, 13:12 ]
Post subject:  Re: WANTED: Seagate 7200.8 400gb HDD Contoller PCB

99% it is not a pcb problem. More probably heads are bad and they do not kick the latch, rather just try to seek and then park, which is a kind of clicking.
Have you disassembled the HDA?


Author:  Waltheof [ January 17th, 2021, 6:41 ]
Post subject:  Re: WANTED: Seagate 7200.8 400gb HDD Contoller PCB

Hi, Pepe,

I'm not quite sure what you mean by "kick the latch".

The heads sit inboard (on the inside circumference) on the platter, and are physically incapable of opening the air-catch which the pivot end of the head-arm sits against. There is an air-channel alongside the platter which directs air onto the air-catch which the releases the head-arm.

As a mechanical engineer I can see how the air-catch works, and understand that it is there to secure the head-arm in the parked position if the platter is not spinning.

As I said in my original post - the platters do not spin-up when power is applied; which suggests an electronic problem rather than a mechanical one.

I appreciate your time in thinking about my problem, and if you have any suggestions I'd be grateful.

All the best.


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