narrow sensor issuesdental X-ray sensor intermittent whiteATC emergency releaseOwandy PCB failureKaVo Dental Handpiece Repairlab workflow optimizationimage artifact analysisGendex sensor restorationprovisional troubleshootingpreload specificationsartifact evaluationWaterlase iPlus serviceSchick sensor serviceDentsply maintenanceGendex X-ray maintenance calibration
