Remove the power harness ........................................................................................................................................ 43
Remove the SureTemp module ............................................................................................................................... 44
Remove the Nonin SpO2 board ............................................................................................................................... 46
Remove the Nonin SpO2 adapter board ........................................................................................................... 47
Separate the main PCA board from the front housing ............................................................................. 47
Remove the touchscreen and display ribbon cable separately from the main PCA
board ......................................................................................................................................................................................... 48
Remove the sensor housing ...................................................................................................................................... 52
Remove the pump assembly ..................................................................................................................................... 53
Replace the main PCA board ..................................................................................................................................... 55
Remove the SpO2 insert ............................................................................................................................................... 56
Remove the bezel from the front housing ....................................................................................................... 56
Remove the SureTemp probe end cap ............................................................................................................... 57
Disassembly and assembly notes for mobile stands and power supplies .................................... 58
Field replaceable units ........................................................................................................... 71
About service kits ............................................................................................................................................................. 72
Cleaning the device ................................................................................................................ 75
Remove liquid spills from the device ................................................................................................................... 75
Dry the equipment .......................................................................................................................................................... 75
Store the device ................................................................................................................................................................. 76
Functional verification and calibration overview ........................................................ 77
Functional verification tests ........................................................................................................................................ 77
Basic functional verification ........................................................................................................................................ 80
Full functional verification and calibration ........................................................................................................ 88
Options and upgrades ........................................................................................................... 93
Available options ............................................................................................................................................................... 93
Upgrading software with the Welch Allyn Service Tool ........................................................................... 94
Upgrade the device firmware ................................................................................................................................... 95
SmartCare services for maintenance and repair ............................................................................................ 95
Service and repair training .......................................................................................................................................... 96
Appendix .................................................................................................................................... 97
Specifications ....................................................................................................................................................................... 97
Factory defaults ............................................................................................................................................................... 101
Troubleshooting ............................................................................................................................................................. 103
Identifying the device and subsystems ............................................................................................................ 131
Interconnect diagram .................................................................................................................................................. 134
Service and maintenance toolset .................................................................................... 135
Service software IT setup .................................................................................................... 137
Service record ......................................................................................................................... 139
iv Contents Welch Allyn® Spot Vital Signs 4400