Service manual

46
3.4.3 Removal of the Chassis
The chassis contains the Main board (revision 04 and earlier), the Power Supply board and the Pump
assembly. SpO
2
equipped models also have the Nellcor Puritan Bennett
™
module fitted in a shield case
fixed to the front plate of the chassis. This is connected to the Main Board via the ribbon cable to SK13.
Unplug this connector. Note that there are no serviceable parts inside this module.
With the front panel removed, take off the front chassis plate by removing the two small Pozidriv
™
retaining
screws.
Lift off the front plate complete with SpO
2
module if fitted. This will give access to the topside of the Main
Board including all the test points and the Flash memory.
The remainder of the chassis can now be released from the rear enclosure by removing a single large
Pozidriv
™
screw located between the printer molding and the pump assembly.
Once the screw has been removed, tilt the chassis forwards and remove the three plugs at the top of the
power supply board. From left to right, these plugs connect to the host port, the power input connector and
the remote alarm. Disconnect the printer cable from the Printer board. The chassis assembly may now be
lifted slightly and eased forwards, so that the speaker plug can be removed from the bottom of the power
supply board.
The chassis assembly may now be lifted clear of the rear enclosure.
Chassis front
retaining screws
Chassis retaining
screw
SK13 for SpO
2
equipped models