Chapter 2 To lower a side trays: (1) Using a large flat-bladed screwdriver undo the two screws that hold down the tray to the chassis, a quarter turn anti-clockwise will cause them to spring out and release the tray. (2) The tray can now be eased upwards a few inches and then turned on its lower-edge hinge downwards into a horizonal position. The right hand tray contains the 32016 processor board, while the left hand tray contains the Winchester drive interface boards and the optional mouse controller board. (3) If necessary, the trays may be removed from the ACW by easing the hinge-pins out of the main chassis. Access to the bottom of the ACW:
(1) BOTH side trays must be lowered as described above. (2) Both remaining quarter-turn screws should be loosened. (3) The rear of the cradle assembly should be moved steadily upwards until two metal stays (the scissors mechanism) are seen to unfold. The stays should be swung fully open and this will raise the cradle assembly further. (4) Allow the stays to travel past their fully open position so that they become locked into the support position. The cradle assembly is now safely supported in its intermediate open position. To open it further, the "scissors bolts" of the two stays must be unscrewed.
This need only be done when major servicing (such as whole unit replacements) is being performed on the 6512A processor board, the Winchester drive and the floppy disc drive. 2.3.3 Re-assembling the ACW (1) Before closing the upper unit ensure that the ribbon and power cables will not be trapped when the unit closes. Push the scissors mechanism on both sides and allow the top unit to close. DO NOT USE EXCESSIVE FORCE (2) Using a large flat point screwdriver push the rear lower quarter-turn screw into the locating hole in the upper unit and locate the slot in the quarter-turn screw body over the mating bar.
DO NOT TURN THE QUARTER-TURN SCREW UNLESS IT IS CORRECTLY MATED (3) Turn the quarter-turn screw until it locks. (4) Carry out the same operation on the opposite side of the ACW. (5) Replace a side tray vertically into its supports on both sides and then press the tray down checking that no cables are being trapped. (6) Locate the tray's locking quarter-turn screws into the upper unit and then gently rotate the quarter-turn screws until they lock. (7) Carry out the same operation on the other tray. Replacing the Upper Case (1) Lower the upper case vertically over the ACW with the fan power lead on the OUTSIDE of the rear upper bracket and reconnect the lead to the fan power socket.
(2) Ease the fan under the bracket while lowering the case. The fan can be viewed through the front VDU aperture. DO NOT TRAP THE 40 WAY RIBBON CABLE, FIXED TO THE OUTSIDE OF THE RIGHTHAND TRAY, BETWEEN THE TOP AND BOTTOM CASES. 16 ACW SERVICE MANUAL Issue 1