MX4000.3
   The low battery circuit on Ron's MX-4200 was  misadjusted
   to  shut  down  the  scanner prematurely when the battery
   voltage fell below 4.7 volts.  I readjusted the low  bat-
   tery threshhold to 4.0 volts.

   You can use the same procedure, but  you  will  need  the
   following equipment:

      o An adjustable, regulated DC power supply, capable of
        furnishing between 3 and 5 volts at 500 mA or more.

      o An accurate means  of  measuring  voltage  from  the
        power  supply.  A digital voltmeter with an accuracy
        of 5% or better is preferred.

      o A #1 Phillips screwdriver.

      o A Small, slotted screwdriver or alignment tool.

continued in file mx4000.1