XM301 defects









From: ac849

Date: 07/30/89-09:21:35 AM Z



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From: ac849
Subject: XM301 defects
Date: Sun Jul 30 09:21:35 1989


       In an article on page 95 of the
April (No. 53) Analog he state of a 
defect in the XM301 which interfers withdisk drive data transfers.

       I have this problem and the article mentions that by 
installing some resistors the problem 
can be cured.  Does anyone know what
resistors and where to install them.

                        Thanks,
                        Frank Carotenuto
                        ac849

** Answered by JOHN SUCHY (aa271) on Mon Jun 15 02:59:26 1987 **

        Thanks for answering your own
question for me off line, Frank.  For
the rest of you, here it is:
 1. Buy 3 resistors: all 470 ohm/             1/4 watt (if you don't
             know what that is, don't
             try this!).
        2. Open XM301 case--THIS VOIDS
             YOUR WARRANTY!
        3. Where the SIO cable meets the             PC board, label and de-
             solder wires 3, 9, and 13.
        4. Solder the resistors (one end             only) into the 3 new holes.
        5. Solder the wires onto the
other end of the resistors
             in the matching holes.

        This procedure buffers the
critical data lines from the computer
and drives.  It should prevent any more
interferance with the drives (and maybe
the printers, too)!
                        Your Co-sysop
                        John E. Suchy
                        aa271
   Thanks for asking and answering!





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