Service manual

68 Infant Flow
®
SiPAP
675-120 Revision D May 2005
13 Remove the Valve/Sensor PCB (13) as follows:
a Disconnect the fuel cell connector SK1 (14) at PL1 on the Valve/Sensor
PCB.
b Disconnect the dump/vent valve connector SK3 (15) at PL3 on the
Valve/Sensor PCB.
c Remove the five screws (16).
d Pull the Valve/Sensor PCB (13) downwards and out forward to
disconnect the PCB from the D plug PL2.
e Disconnect the exhaust tubes and the PA flow tube and remove the
Valve/Sensor PCB.
14 At the blender, disconnect the air supply (17), the oxygen supply (18), the
whistle outlet tube (19) and the main outlet (20).
15 Remove the four screws (21) securing the blender (22) and remove the
blender. Do not remove the collet knob on the front of the blender.
16 Remove the pilot drive check valves as follows:
a Note location of cable ties securing the check valve assemblies behind
the flow meters, then cut and remove the cable ties.
b Hold the nut (25) and unscrew the cylinder body (23).
c Remove the duckbill check valves (26), guide (27) and seat (28).
d Discard the duckbill check valves (26).
17 Replace the blender check valves and filter at the blender inlet (refer to the
Blender Service Manual if installing the Blender Overhaul Kit).
18 Replace the blender alarm bypass components (refer to the Blender Service
Manual if installing the Blender Overhaul Kit).