Beisler 1281-4 - Manual (Page 47)

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Replacement of the front box – this is the statical element of the connec-
tion control box and of the foot pedal; each transmission element of the pedal
is calibrated; since that, the front box should only be replaced as a whole.
Replacement of the motor – this is fixed with four screws in the motor
housing; the control board must be removed before it can be demounted.
Loading of new software – future developments can be loaded into the
control by replacing an EPROM; to replace the EPROM, remove rear cover,
replace EPROM (mounted on a frame in the upper left corner); when inser-
ting the new EPROM be sure to insert all pins and bend none.