Service manual

vi Contents Welch Allyn Spot Vital Signs
3 - Functional overview .....................................19
Power on/off and system check procedure ............................19
Internal configuration mode ........................................20
Functional verification .............................................21
Temperature functional check ...................................22
SpO2 functional check .........................................24
4 - Calibration .............................................25
Connections ....................................................25
Voltage calibration................................................27
Blood pressure calibration .........................................27
Date/time set ...................................................28
5 - Troubleshooting ........................................29
Error codes .....................................................29
Causes and corrective action .......................................30
Battery voltage check .............................................33
Window display check ............................................33
Blood pressure calibration check ....................................33
Temperature functional check ...................................34
Masimo SpO
2
functional check ..................................34
Nellcor SpO
2
functional check ...................................34
Communication option check....................................34
Functional testing procedures ......................................34
Current test.....................................................35
Noise levels ....................................................35
Button test .....................................................35
Interface test ...................................................36
Print quality .....................................................36
Pneumatic tests .................................................37
Fail safe (over pressure) test .......................................37
Service work checklist ............................................38
6 - Disassembly and repair ..................................39
Battery disassembly ..............................................40
Temperature disassembly .........................................41
Front housing and key pad disassembly...............................42
LCD disassembly ................................................42
Power and battery cable disassembly ................................43
Main printed circuit board assembly..................................44
SpO
2
circuit board disassembly .....................................45
Masimo board ...............................................45
Nellcor board ................................................47
Pump and valve disassembly .......................................48
7 - Technical overview ......................................51
System description ...............................................51
Battery /charge system ........................................51