Dead IMI-drive (was Re: Onyx C8000: good news and bad news as well)

From: Philip Pemberton <>
Date: Wed Sep 15 14:47:55 2004

In message <>
          "Pierre Gebhardt" <> wrote:

> This reversed diode sits on a small PCB outside the motor.
> I disconnected it, having the two wires of the 24V DC Motor in my hands.
> There's almost no measurable resistor between these wires... this leads me to the assumption that the coil produces a short circuit.
> Connecting the motor wires directly to the 24V connectors of the power supply leads to a shutdown when beeing turned on.

Is it possible that the drive may be suffering from sticktion? If the head is
stuck to the drive platter to the point of the spindle motor and platters
being completely jammed, depending on the motor, I suspect you might get a
near-dead short. Is there any way to rotate the motor spindle/head positioner
without ripping the cover off the HDA?

Phil.                              | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB,              | ViewFinder, 10BaseT Ethernet, 2-slice,  | 48xCD, ARCINv6c IDE, SCSI
... Never attribute to malice that which may be explained by stupidity.
Received on Wed Sep 15 2004 - 14:47:55 BST

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