Before the keyswitch can be lifted clear there are 2 latches to be sprung whilst easing the switch upwards. Its easy done with 2 screwdrivers.
The switch had come apart sometime, it had been forced together and bent the contacts. So I straightened them with pliers.
All the keyswitch components ready for re-assembly. Check switch functionality with a meter before refitting.
To re-fit the switch, press it back into place and re-solder the 2 pins on the rear of the PCB.
Wipe all the keys off with damp cloth, they will clean up great. Next refit them to the board by just pressing them onto the switchtops.
The keystrip is best cleaned with liquid brass cleaner wiped on and off with a soft cloth. but DO-NOT!! wipe the rear painted side, or you will loose your BBC logo. Irrecoverable!!
To clean the case, spray it with water and scrub with a toothbrush, the evidence speaks for itself. It wont cure yellowing but it makes a great difference.
All the component parts of an Acorn BBC Model-B ready for reassembly. Just follow the above but in reverse!! Easy.
All the parts back in the case, a grubby Beeb looking like new again. Final step, replace the lid and secure with its 4 retaining screws. Switch on and enjoy!