Da: cctalk-bounces@classiccmp.org per conto di jim stephens
[jwstephens@msm.umr.edu]
Inviato: giovedì 4 maggio 2006 19.46
A: General@a2sistemi.org; Discussion@a2sistemi.org:On-Topic and
Off-Topic Posts
Oggetto: Re: Parking heads on Honeywell DPS6

Alberto Rubinelli - A2 Sistemi wrote:

>I'm going to move an old Honeywell DPS6, working.
>I've in mind to park the heads of the disk ... but how ?
>The disk unit is from Magnetic Peripherals , model 9448
>Internal parts are from CDC , the only code present is BJ7D1-A
>Anyone know this unit/system ?
>
>Thanks
>
>Alberto
>
>  
>
Is this the 96mb, 16 removable single platter, over 80 fixed, or is it 
the 80,
or 160mb mini module?  If it is the mini module, you drop the bottom cover
and there is a head lock near the front.  There is a spindle lock to stop
the drive from rotating that is on the HDA that is integrated into the
static tab assembly that touches the center of the spindle.  This requires
a phillips head to remove this strap, and then rotate the spindle till the
tab engages a raised round slot on the spindle, blocking it.  you then
replace the two screws to leave it blocked.

I think the 96mb unit has a similar system, but we only used the sealed
hda's.

Jim

Da: cctalk-bounces@classiccmp.org per conto di Tony Duell
[ard@p850ug1.demon.co.uk]
Inviato: giovedì 4 maggio 2006 21.39
A: cctalk@classiccmp.org
Oggetto: Re: Parking heads on Honeywell DPS6

> 
> I'm going to move an old Honeywell DPS6, working.
> I've in mind to park the heads of the disk ... but how ?
> The disk unit is from Magnetic Peripherals , model 9448
> Internal parts are from CDC , the only code present is BJ7D1-A
> Anyone know this unit/system ?

I have the CDC9448 service manual in front of me. I believe this is what 
was called a 'Phoenix' drive

To lock the heads, first remove the top cover from the drive (screws on 
the back IIRC). On top of the positioner is a metal bar, held down by a 
screw at one end. Near that end there's a pin sticking out from one side 
of the bar. And a pin sticking out from the other side at the other end 
of the bar.

Remove the screw holding the bar in place and engage the pin near the 
mounting hole with the hole in the head carriage. Then screw the bar back 
to the positioner frame. The idea is that the bar will then lock the 
carriage in the home position.

The pin at the other enf of the bar is used to hold the carriage at the 
right position for head alignment. It's used when the drive is spinning 
-- moving tyhe heads out that far with the drive stopped will do a lot of 
damage.

-tony