HP3000-L Archives

November 2020, Week 4

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Subject:
Re: [EXT]: Fwd: HP 7900A drive maintenance
From:
Gary Robillard <[log in to unmask]>
Reply To:
Gary Robillard <[log in to unmask]>
Date:
Mon, 23 Nov 2020 19:07:56 -0700
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I’m sure you would need to remove the belt, it’s been almost 40 years though...I am pretty sure I have a 7900 head alignment tool... but it isn’t important for the lower platter... At least it had the optical encoder so no servo code to write like a 7905/6 lower platter...

Thanks,
Gary Robillard

Sent from my iPhone

> On Nov 22, 2020, at 11:13 PM, Stan Sieler <[log in to unmask]> wrote:
> 
> External Email
> Jack Rubin ([log in to unmask]<mailto:[log in to unmask]>) writes:
> 
> ---------- Forwarded message ---------
> From: Jack Rubin <[log in to unmask]<mailto:[log in to unmask]>>
> Date: Sun, Nov 22, 2020 at 9:45 AM
> Subject: HP 7900A drive maintenance
> 
> Hello -
> 
> I'm bringing a 7900A back online and cleaning it prior to spin up. I've renewed the foam gasket that feeds filtered air to the removable disc, but I'm not sure how to get to the fixed disc for inspection/cleaning. As part of the maintenance procedure, the manual says to clean the lower disc assembly. My question is how? HP says to "Remove the lower disc assembly." That's it - no further details.
> 
> Can you provide any clues? It looks like there is a shield that may or may not retain the assembly but removing it seems to require removing the drive pulley. If it comes to that, is there anything special about mounting/unmounting the pulley (Loctite, torque spec, etc.)? Changing the pulley was clearly a field operation to allow for 50/60 Hz operation but again no details in the manual. I've also got the CE Handbook but no hardware specs there.
> 
> Any thoughts or help would be appreciated. Any retired CE's around who might have more info?
> 
> Thanks,
> Jack
> ----------
> 
> If anyone can help him, that would be great!
> 
> thanks,
> 
> Stan
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