Assembly, Packaging and Installation 2.3.2 Access to components The upper case assembly is plastic and is held in place by two lugs at the front of the machine (which cannot be seen when the case is in place) and two plastic case clips at the rear. Each rear clip is covered by a metal safety clips. Removing the Top Case : Refer to Figure 2.3.2 (a) & (b). (1) Remove any floppy disc from the machine and move the floppy disc lever to the horizontal position. (2) Unscrew the two Phillips headed screws holding the rear metal safety clips, remove and store the clips and screws.
(3) Unhook the two plastic case clips by pulling the bottom of the clips away from the case and unhook the top of the clips from the case top. DO NOT ATTEMPT TO SEPARATE THE BEZEL FROM THE UPPER CASE: IT IS FIXED (4) Pull the bottom edge of the black front plastic bezel away from the lower edge of the disc drives so that it sits on the front face of the disc drives just below the floppy disc lever. (5) Separate the case at the rear and gently raise the upper case vertically sliding the bezel front gently over the floppy disc lever. (6) The rear fan should now be adjacent to the internal rear upper bracket so that by gentle movement the fan will slide past the rear cross member.
The fan can be viewed through the front VDU aperture. (7) DISCONNECT THE FAN POWER LEAD AT THE REAR BY SQUEEZING THE MATING PLUG CLIP. (8) Keep the upper case level and remove it from the machine. On each side tray there are two quarter-turn captive screws which hold the side trays to the main chassis. Towards the rear of the metal chassis are two more that hold down the main chassis which is pivoted at the front. See Figure 2.3.2 (c). ACW SERVICE MANUAL Issue 1 13