Welch Allyn Spot Vital Signs 4400, Service Manual

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Future revisions of a part may not always be backward compatible with a legacy part. To determine
the correct replacement part for your unit always provide the serial number and model when
ordering.
Manufacture Date: How to Decode Serial Number, Lot codes
The Serial number (SN) of a device reveals many details about its manufacture. The last four digits
of the device SN reveal the device’s date of manufacture.
SN: XXXX####WWYY
where
XXXX = Manufacturing plant
#### = Sequential number of manufacture
WW = Week of manufacture
YY = Year of manufacture
Device serial number and model label
The model number and serial number can be found on a label on the back housing.
Serial number and format code
Serial number XXXX####WWYY
XXXX Manufacturing plant
#### Sequential number
WW Week of manufacture
YY Year of manufacture
Device circuit board and internal options label
Circuit board and internal option labels
Service manual Appendix 121