4.The subassembly is a large metal casing that encloses the horizontal drive bays and the power supply, as shown below.
subassem b l y
To remove the subassembly, first lift it up from the front only. Place your thumbs under the diskette drive and grasp the top edge of the computer with the rest of your fingers, as shown below. (If you have a diskette drive installed in the lower horizontal drive bay, place your thumbs underneath that drive instead.)