Nellcor N-180 Service Manual page 64

N-180 Pulse Oximeter Service Manual
Oximetry module (84)
CPU/oximeter module cable (24)
Middle shield (47) and
middle shield insulator (46)
Washer (82)
and spacer (83)
CPU PCB
connectors
" (11) (12) (13)
(15) (17) (18)
28018A/45
Figure 6-6: Middle Shield Components
CPU PCB and LCD PCB
The CPU PCB can be removed as a single unit. To remove the CPU PCB you
have to first remove the oximetry module and the middle shield. To remove
the CPU PCB (figure 6-7):
1
2.
3.
4.
Remove middle shield following instructions in this section.
Remove three screws that hold the bottom shield to the bottom cover.
Remove 20-conductor ribbon cable from CN2.
Remove 2-conductor speaker cable on CN1.
Lift bottom shield free:
Remove four screws that fasten CPU PCB to bottom shield. (A fifth
screw holds the mylar insulation in place; you can leave this screw
fastened.)
6-10