Figure 2-5. Front panel, exploded view
c. Pushbutton replacement. The six lighted pushbuttons are replaced as an assembly. Proceed as
(1) Remove the cover from the top of the control unit by removing 11 screws and washers from
the top and 5 screws and washers from the rear of the cover.
(2) Remove four screws (9, fig. 2-5), nuts (12), washers (10), and lockwashers (11) from the
front panel of the control unit that surround the six lighted pushbuttons.
(3) Remove the plug (P2) from the jack (J2) on the back of the lighted pushbutton assembly.