12 Nov
1998
12 Nov
'98
12:33 a.m.
Date: Thu, 12 Nov 1998 09:08:13 -0800
Reply-to: classiccmp(a)u.washington.edu
From: Marvin <marvin(a)rain.org>
To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
Subject: Re: Power interlocks (was Re: [OT] Alphaserver Oops!)
jpero(a)pop.cgocable.net wrote:
Actually, it is not okay in this
instance. The problem is that the laser
beam goes through a series of prisms, mirrors, and gratings from the time it
leaves the laser, reflects off the disk, and gets back to the photo diode
array. Getting a 20 mil or so beam lined up to close tolerances (5 mils?)
can be a bit tricky on the described path of about 20+". The assemblys I
removed were the mirrors and prisms that reflect the beam onto the disk, and
back through the path to the photo diode array. The alignment can be done
without special equipment/fixtures ... given enough time :).
I don't mean this one so I go...
That should have been clarified:
The len, all the glass bits, laser and sensor leave it be and often
they're all in one module. No problem removing the whole thing
if only taking the rails off.
Done that so many times just to clean off all the old grease and
relube to revive many cdrom drives ditto removing the spindle motors
to take shorts out.
Jason D.
email: jpero(a)cgocable.net
Pero, Jason D.