BIO-MED DEVICES CROSSVENT-3+ Operation & Service Manual page 73

IX. MAINTENANCE AND SERVICE- cont.
SYMPTOM
Oxygen will not calibrate.
Pressure will not calibrate.
Pressure unable to reach 120
cmH O during operation.
2
Flow will not cal.
(See following symptom also)
Flow will not reach 120 LPM
or displayed flow does not
agree with actual flow.
VENTILATOR FAILURE
flashes on display
Pneumotach reading greatly
inaccurate
Unit hangs with Bio-Med
Devices on the display
Continuous Audible Tone
POSSIBLE CAUSE
Aged sensor.
Bad IC602, L301 (no +5V analog)
Bad cable.
Tubing leak.
TD-AIRWAY bad.
Loosing pressure
Pressure Relief Valve.
DARV leaking at seat or signal
pressure.
Bad connection at JPOT
Defective flow encoder.
Bad IC603.
Defective atmospheric
compensation circuit.
Supply pressure too low.
Max Pressure not on or defective.
Flow restriction or leak.
Input filter clogged.
Regulator set too low.
Flow valve defective.
Refer to Appendix E
Leak in breathing circuit
Bad transducer (TD-PNEUMO)
Microprocessor failure
Devices controlling the
beeper have failed.
CORRECTIVE ACTION
Replace sensor.
Replace IC602, L301.
Replace cable.
Replace tubing.
Replace TD-AIRWAY.
through Clean, re-cal or replace Relief
Valve.
Clean seat, repair leak, re-cal or
replace.
Reconnect
Replace 10K pot.
Replace IC603.
Check TD-ATMOS.
Check supply
ventilator input fitting while
gas is flowing.
specification on side of case.
Turn Max Pressure fully on or
repair.
Check for restrictions and leaks
in flow path.
Replace filter and resolve cause
Calibrate regulator pressure.
Check flow valve.
Replace solenoid.
Replace solenoid wire.
Power off/on. If persists, then
return to factory for service.
Check all circuit connections
Replace transducer
check associated circuitry
Return to factory
alarm Return to factory
pressure at
Should meet
and/or
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