NEC POWERMATE P - SERVICE MANUAL 1995 Service And Reference Manual page 124

3. Remove the two side panel screws from the rear of the system unit (see
Figure Section 5-1). If you have installed a padlock on the system, unlock the
padlock and remove it.
4. From the rear of the system, position one hand on the protruding handle and the
other hand under the side panel and slide the panel toward the rear about one
inch.
5. Lift the side panel away from the system unit.
Figure Section 5-1 Side Panel Removal
Repair 5-3