Mallinckrodt NELLCOR NPB-4000 Service Manual page 52

Section 6: Disassembly Guide
6-2
The ovals on the flow charts contain reference designators that point to specific
steps in the Disassembly Procedures. The Disassembly Procedures, paragraphs
6.4, 6.5, and 6.6 contain detailed disassembly instructions, accompanied by
illustrations.
The rectangular boxes on the flow charts represent the various components or
sub-assemblies. The digits appearing in these boxes are the part numbers of the
component or subassembly. Section 7, Spare Parts, contains a complete listing
of the available spare parts and exploded views.