Description of Event or Problem · 1
SYMPTOM: THE ORIGINAL DESIGN NAV-RING FUNCTIONALITY IS UNRESPONSIVE OR INTERMITTENT.CAUSE: THE ORIGINAL DESIGN FRONT BEZEL HAS A LOCATING NOTCH (FIGURE 1) MOLDED INTO THE PLASTIC AND THE NAV-RING OVERLAY HAS A LOCATING CUT-OUT, BOTH WERE USED FOR ALIGNMENT DURING MANUFACTURING AND SERVICE. IT HAS BEEN DETERMINED THAT THE NAV-RING CUT-OUT IS SUSCEPTIBLE TO LIQUID INGRESS CAUSING THE NAV-RING TO BE NON-RESPONSIVE. THIS TYPICALLY OCCURS WHEN CLEANING AGENTS WERE SPRAYED DIRECTLY AND REPEATEDLY ONTO THE NAV-RING ASSEMBLY.======================MANUFACTURER RESPONSE FOR RESPIRONICS V-60 VENTILATOR, V-60 VENTILATOR (PER SITE REPORTER).======================ACTION FOR PERFORMANCE - RETROFIT ON FAILURE.REMEDY: REPLACE THE ORIGINAL NAV-RING BY INSTALLING A 2ND GENERATION FRONT BEZEL WHICH REMOVE THE MOLDED NOTCH IN THE UI FRONT BEZEL AS WELL AS THE CUT-OUT IN THE NAV-RING OVERLAY. THIS WILL IMPROVE THE ROBUSTNESS OF THE NAV-RING ASSEMBLY AND GREATLY REDUCE THE SUSCEPTIBILITY OF LIQUID INGRESS.