From: Jerrold L Porter <jlporter@ccgate.dp.beckman.com>
  To  : rasmb@bbri.eri.harvard.edu, jcorreia@umsmed.edu
  Date: Mon, 21 Aug 1995 10:37:38 -0800 (pst)

Re[2]: Cleaning #3

We have been instructing Field Service to use toothpaste or an eraser 
since we started shipping the instrument. Once you have cleaned the 
lamp the best you can, it must be clean of all residue. 90+% alcohol 
or ethanol works fine.

The four thumbscrews are factory adjustments and should not be 
touched. This adjustment is very critical and I do not recommend it to 
be performed in the field.

The lamp assy. should be marked for its orientation prior to removing 
it and cleaning.

Once your Field Service Engineer instructs you on the cleaning and 
replacing the assy., ask him/her if it will impact your 
contract/warranty coverage if your alignment winds up being a Service 
Call.

PS - If your XL-A PC is connected to a modem, we can offer remote      
     diagnostics. For more information send to                         
     JLPorter@ccgate.dp.beckman.com, include your Field Service        
     Engineer's name.

Best regards


______________________________ Reply Separator _________________________________
Subject: Re:  Cleaning #3
Author:  jcorreia@umsmed.edu (Jack Correia) at INTERNET
Date:    7/14/95 12:16 PM


     Caution:  get your service guy to show you how to do optics cleaning at 
least the first time!  If you forget to turn off the power when you lift the 
slit assembly you max out the photomultiplier - it will recover but it may 
take overnight.  The alignment of the lamp can get screwed up if you are not 
careful!  We simply prefer to do it ourselves to save time - it take me < 30 
minutes with the pre- and post-scans to do it!

     So someone asked me by E-mail and I think it's a good question!  My 
Beckman service tech prefers the eraser method so he never answer my query - 
Which toothpaste is best for this job - tarter control Crest or some 
Australian blend from the outback?

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| Dr. Jack Correia              |
| Univ. of Miss Medical Center  | 
| 2500 N. State St.             |
| Jackson, MS, 39216            |
| (601) 984-1522                | 
| fax (601) 984-1501            |
| correia@fiona.umsmed.edu      |
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