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

From: Tothwolf <tothwolf_at_concentric.net>
Date: Wed Jul 31 23:31:00 2002

On Thu, 1 Aug 2002, Tony Duell wrote:

> Yes, please do. We'll both feel right idiots if we spend time looking in
> the servo circuitry and that real reaso the heads can't move is becuase
> they're locked.

I double checked it, and it does have 11.5VDC across the connector when it
seems to pull in.

Two of the 4558s on A103 have -10.5VDC on pin 4, and 11.5VDC on pin 8. The
third 4558 seems to have pin 4 grounded (according to an ohm meter), which
seems strange, to say the least.

> It's up to you, it's your drive. And don't you think the HDA has been
> opened before? If that's the case, then it might not do any more daamge
> to pull the cover again.

The seals that cover the screws have been broken, so the HDA appears to
have been opened by someone in the past.

-Toth
Received on Wed Jul 31 2002 - 23:31:00 BST