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8
Troubleshooting guide
Caution
When the main PCB, flow meter or motor is replaced, the flow generator must be
recalibrated and tested. Follow the procedures in Section 7 Calibration procedures to
!
calibrate the unit, then repeat tests 6-17 in Section 3 General inspection and servicing.
If any other components are replaced, repeat the relevant tests in Section 3 General
inspection and servicing
Note:
The performance tests in the service software are a valuable tool in determining the
possible cause of flow generator problems.
Problem/Cause
No display
•
Flexible cable from LCD not inserted properly into
connector
•
Faulty LCD
•
Flexible cable from LCD damaged
Buttons not working or intermittent
•
Flexible cable from LCD not inserted properly into
connector
• Pills on the back of the keypad or LCD have been
damaged
• Gold contacts on main PCB dirty
Poor or insufficient air flow
•
Ramp time is in use
•
Air tubing not connected properly
•
Air tubing kinked or punctured
•
Inlet air filter is clogged up
•
Calibration gain set too low
•
Faulty motor
•
Motor drive controller too low
Excessive air flow
•
Calibration gain set too high
•
Motor drive controller too high
Flow generator not operating (no display when power on)
•
Blown fuse in power supply
•
Faulty main PCB
•
Faulty power supply
Action
•
Check flexible cable is connected properly
•
Replace LCD module
•
Replace LCD module
•
Check flexible cable is connected properly
• Replace keypad or LCD
• Clean contacts. Refer to "4 Internal examination (if
necessary)" on page 10.
•
Wait for air pressure to build up or change ramp time
•
Check and refit tubing as required
•
Refit or replace as required
•
Check and replace filter as required
•
Recalibrate flow generator
•
Replace motor
•
Replace main PCB
•
Recalibrate the flow generator
•
Replace main PCB
•
Replace and investigate cause of the blown fuse
•
Replace main PCB
•
Replace power supply PCB
8 Troubleshooting guide
47
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