User's Manual

4. Disassembly and assembly
To service the Z80 second processor, disconnect it from the BBC
Microcomputer and the mains supply and undo the three fixing screws;
two at the top of the back panel and one underneath the unit, nearest
the front and equidistant between the two rubber feet. (The assembly
diagram is given in the Appendix). The lid can now be removed
revealing the transformer and power supply
board, held in place by six screws, and the Z80 PCB. It is recommended
that the transformer and power supply board are not removed unless
absolutely necessary.
To remove the Z80 PCB from the case, pu11 off the two "fast on" tabs
which connect the power supply (brown +5v and black 0v leads) and
remove the four screws which hold the PCB in place.