External Examination; Internal Examination (If Necessary) - ResMed VPAP III, VPAP III ST, VPAP III ST-A Service Manual

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External examination

External examination External examination External examination
1 Visually examine the flow generator for external damage such as:
• deformation or cracking of the upper or lower cases
• damaged components such as the mains power inlet or mains power switch
• damage to the front panel decal or bottom decal
If either of the outside cases are fractured and require replacement, take particular care in
inspecting all other components within the cases for damage.
2 Press the Service record results button.
3 Open the file saved earlier, containing the unit's clinical settings.
4 Check the appropriate box for the external examination.
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Internal examination (if necessary)

Internal examination (if necessary) Internal examination (if necessary) Internal examination (if necessary)
Caution
The VPAP III uses an isolated power supply, however, it is recommended that isolation
transformers are also used for added safety while working with the cases opened up and
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power switched on.
Remove the front cover, interface assembly and the top case of the flow generator by following the
instructions given in Section 5 Replacing major subassemblies. Inspect the flow generator
for the following, recording any irregularities:
• The blower assembly is seated correctly
• The Power Supply PCB is seated correctly
Inspect the unit for the following, recording any irregularities:
• all mechanical components are seated correctly
• all electrical components are mounted correctly and secured in position
• there are no loose terminals, loose wires or incomplete insulation on electrical components or
connections
• there are no loose pieces of wire or other objects trapped in the PCB
Use an antistatic cloth or brush to remove dust or dirt from components and from the insides of
the flow generator case.
Repair or replace any missing or damaged external components. Rectify any problems either
identified by the user or noted during servicing. Should any major components such as the blower
assembly or the Main PCB require replacement, the recalibration procedure as given in Section 7
Calibration procedures must be performed before the unit is returned to the patient.
Reassemble the flow generator.
Record the results by checking the appropriate box in the Record of Service window.
Caution
Printed circuit boards can be damaged by static electricity. Please read the instructions in
Section 4 Static Precautions before attempting to replace any PCBs.
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Thread cutting screws are used to fasten the cases of the flow generator. When replacing
a thread cutting screw, turn the screw anti-clockwise until it fits into the previously cut
thread. Otherwise the original thread may be stripped out.
10 VPAP® III, VPAP III ST, VPAP III ST-A Service Manual