- Image quality
- Dark, discolored, blurry, flickering, or noisy video feed; optical fiber bundle breakages or black spots in fiber scopes.
- Fluid leaks & distal tip
- Failed positive or negative leak tests, fluid ingress, and physical damage to the distal objective or bending rubber.
- Air & water delivery
- Restricted or uneven air/water flow, insufficient feed pressure, and blocked nozzle outlets.
- Angulation & steering
- Restricted tip deflection, stiff or loose control knobs, broken angulation cables, and dislodged spiral sheath.
- Insertion tube & jacket
- Buckling, flattening, wrinkles, surface scratches, chemical degradation, or pinhole perforations along the insertion tube.
- Optical light transmission
- Broken illumination fibers, diminished field brightness, or fractured light-guide bundles.
- Channels, suction & switches
- Clogged or kinked biopsy channels, weak suction flow, and non-responsive or sticking remote control valves.