HP 750 - Manual (Page 67)

4 Loosen the screws on top of the electronicsĆenclosure cover and the top two rear screws.
D/A1 size plotters have four screws. E/A0 have six.
When reassembling, first tighten the rear screws.
5 Slide the center cover out from under the screws and lift it clear of the plotter.
Tx 15
6-15 Removal and Replacement C4705-90000