Multibus ST-506/QIC-02 (was: Re: SGI IRIS 1400 ...)

From: Tothwolf <>
Date: Sat Jul 20 19:19:00 2002

On Sun, 21 Jul 2002, Tony Duell wrote:

> > No idea, but I imagine if the earlier V150 drives did, the V170 likely
> THinking about it some more, I now seem to remember that the head lock
> was only present on drives using the servo board _without_ the bybrids.
> > does too. There is a small dip relay on the second board, which I'd
> > imagine would be used for such a solenoid...
> No, the relay is almost certainly the spindle motor brake. The head lock
> solenoid was driven by a power transistor transistor. IIRC the head lock
> iteslf was a cylindrical metal housing on the bottom of the HDA next to
> the spindle motor. It fitted through a hole in the servo board and had a
> 2 wire cable that plugged into the servo board alongside the hole.

The V170 I have does not have that, so I guess it probably does not have a
head lock solenoid.

Received on Sat Jul 20 2002 - 19:19:00 BST

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