fzabkar wrote:
It might be interesting to see how a drive behaves if we could disable the piezo actuator, assuming this is the problem. I'm wondering whether disabling this second stage actuator would still allow the drive's primary actuator to follow the track. Perhaps this would be a better approach than feeding incorrect adaptives to the secondary actuator.
That said, the HDA connector doesn't appear to have any aditional pins (18), so I am at a loss to understand how the piezoelectric transducers are driven. I would expect that the motor controller would generate a driving voltage, and that this single voltage source would be multiplexed to the selected head via an IC on the headstack. Alternatively, it could be that all PZTs are activated at the same time.
Perhaps a photo of the preamp would help?
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Aye Aye Captain. I shall try this and post my findings here.It has to be multiplexing, they can multiplex a voltage level surely, but to drive a whole set of coil to move something around, they may require some amount of current too as just voltage won't just do enough. So may be at the same time,when the voltage gets multiplexed, the current is feed by the servo IC(voltage controlled current source which is taking its voltage input feed from the multiplexed voltage. Once voltage detected, due current is pushed from the servo IC to move the coils??? Who knows?
I think a great deal of multiplexing is done to read from so many heads one by one while keeping the pin count constant to company mfg standards. However, multiplexing of a current line instead? sounds quite out of my experience tbh.
Or is it that very small current is required to drive this coil and the required current can be pulled from this multiplexed voltage source itself.
no idea.
Was just caught up with the conclusion of 7th semester exams and hence could not reply in time.
I have a friends NMVW which he just give away for a small amount...I haven't tested it for uniqueness as we are currently imaging the drive so that he can move his data to his bigger drive.
Let me see if the uniqueness applies here too.
Let me see if I can send you a snap of heads etc.
But why do I have a feeling (or lack of experience possibly) that there are no secondary set of heads.
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Arctic Monkeys - Arabella